Using the FiftyOne App

The FiftyOne App is a powerful graphical user interface that enables you to visualize, browse, and interact directly with your datasets.

Note

Did you know? You can use FiftyOne’s plugin framework to customize and extend the behavior of the App!

App environments

The FiftyOne App can be used in any environment that you’re working in, from a local IPython shell, to a remote machine or cloud instance, to a Jupyter or Colab notebook. Check out the environments guide for best practices when working in each environment.

Sessions

The basic FiftyOne workflow is to open a Python shell and load a Dataset. From there you can launch the FiftyOne App and interact with it programmatically via a session.

Creating a session

You can launch an instance of the App by calling launch_app(). This method returns a Session instance, which you can subsequently use to interact programmatically with the App!

import fiftyone as fo

session = fo.launch_app()

App sessions are highly flexible. For example, you can launch launch multiple App instances and connect multiple App instances to the same dataset.

By default, when you’re working in a non-notebook context, the App will be opened in a new tab of your web browser. See this FAQ for supported browsers.

Note

fo.launch_app() will launch the App asynchronously and return control to your Python process. The App will then remain connected until the process exits.

Therefore, if you are using the App in a script, you should use session.wait() to block execution until you close it manually:

# Launch the App
session = fo.launch_app(...)

# (Perform any additional operations here)

# Blocks execution until the App is closed
session.wait()

# Or block execution indefinitely with a negative wait value
# session.wait(-1)

Note

When working inside a Docker container, FiftyOne should automatically detect and appropriately configure networking. However, if you are unable to load the App in your browser, you many need to manually set the App address to 0.0.0.0:

session = fo.launch_app(..., address="0.0.0.0")

See this page for more information about working with FiftyOne inside Docker.

Note

If you are a Windows user launching the App from a script, you should use the pattern below to avoid multiprocessing issues, since the App is served via a separate process:

import fiftyone as fo

dataset = fo.load_dataset(...)

if __name__ == "__main__":
    # Ensures that the App processes are safely launched on Windows
    session = fo.launch_app(dataset)
    session.wait()

Updating a session’s dataset

Sessions can be updated to show a new Dataset by updating the Session.dataset property of the session object:

import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("cifar10")

# View the dataset in the App
session.dataset = dataset

Updating a session’s view

You can also show a specific view into the current dataset in the App by setting the Session.view property of the session.

For example, the command below loads a DatasetView in the App that shows the first 10 samples in the dataset sorted by their uniqueness field:

session.view = dataset.sort_by("uniqueness").limit(10)

Loading a sample or group

You can immediately load a specific sample in the modal when launching a new Session by providing its ID via the sample_id parameter:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
sample_id = dataset.last().id

session = fo.launch_app(dataset, sample_id=sample_id)

You can also programmatically load a sample in the modal on an existing session by setting its session.sample_id property:

sample_id = dataset.take(1).first().id

session.sample_id = sample_id

Note

Did you know? You can link directly to a sample by copy + pasting the App’s URL into your browser search bar!

Similarly, for group datasets, you can immediately load a specific group in the modal when launching a new Session by providing its ID via the group_id parameter:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart-groups")
group_id = dataset.last().group.id

session = fo.launch_app(dataset, group_id=group_id)

You can also programmatically load a group in the modal on an existing session by setting its session.group_id property:

group_id = dataset.take(1).first().group.id

session.group_id = group_id

Note

Did you know? You can link directly to a group by copy + pasting the App’s URL into your browser search bar!

Remote sessions

If your data is stored on a remote machine, you can forward a session from the remote machine to your local machine and seamlessly browse your remote dataset from you web browser.

Check out the environments page for more information on possible configurations of local/remote/cloud data and App access.

Remote machine

On the remote machine, you can load a Dataset and launch a remote session using either the Python library or the CLI.

Python

CLI

Load a Dataset and call launch_app() with the remote=True argument.

# On remote machine

import fiftyone as fo

dataset = fo.load_dataset("<dataset-name>")

session = fo.launch_app(dataset, remote=True)  # optional: port=XXXX

You can use the optional port parameter to choose the port of your remote machine on which to serve the App. The default is 5151, which can also be customized via the default_app_port parameter of your FiftyOne config.

You can also provide the optional address parameter to restrict the hostnames/IP addresses that can connect to your remote session. See this page for more information.

Note that you can manipulate the session object on the remote machine as usual to programmatically interact with the App instance that you’ll connect to locally next.

Run the fiftyone app launch command in a terminal:

# On remote machine

fiftyone app launch <dataset-name> --remote  # optional: --port XXXX

You can use the optional --port flag to choose the port of your remote machine on which to serve the App. The default is 5151, which can also be customized via the default_app_port parameter of your FiftyOne config.

Local machine

On the local machine, you can access an App instance connected to the remote session by either manually configuring port forwarding or via the FiftyOne CLI:

Manual

FiftyOne

Open a new terminal window on your local machine and execute the following command to setup port forwarding to connect to your remote session:

# On local machine
ssh -N -L 5151:127.0.0.1:XXXX [<username>@]<hostname>

Leave this process running and open http://localhost:5151 in your browser to access the App.

In the above, [<username>@]<hostname> specifies the remote machine to connect to, XXXX refers to the port that you chose when you launched the session on your remote machine (the default is 5151), and 5151 specifies the local port to use to connect to the App (and can be customized).

If you have FiftyOne installed on your local machine, you can use the CLI to automatically configure port forwarding and open the App in your browser as follows:

# On local machine
fiftyone app connect --destination [<username>@]<hostname>

If you choose a custom port XXXX on the remote machine, add a --port XXXX flag to the above command.

If you would like to use a custom local port to serve the App, add a --local-port YYYY flag to the above command.

Note

Remote sessions are highly flexible. For example, you can connect to multiple remote sessions and run multiple remote sessions from one machine.

Using the sidebar

Any labels, tags, and scalar fields can be overlaid on the samples in the App by toggling the corresponding checkboxes in the App’s sidebar:

By default, only label fields (excluding heatmaps and semantic segmentations) are visible by default, but you can programmatically define a dataset’s a default configuration for these checkboxes by setting the active_fields property of the dataset’s App config:

# By default all label fields excluding Heatmap and Segmentation are active
active_fields = fo.DatasetAppConfig.default_active_fields(dataset)

# Add filepath and id fields
active_fields.paths.extend(["id", "filepath"])

# Active fields can be inverted setting exclude to True
# active_fields.exclude = True

# Modify the dataset's App config
dataset.app_config.active_fields = active_fields
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

You can conveniently reset the active fields to their default state by setting active_fields to None:

# Reset active fields
dataset.app_config.active_fields = None
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

If you have stored metadata on your fields, then you can view this information in the App by hovering over field or attribute names in the App’s sidebar:

Filtering sample fields

The App provides UI elements in both grid view and expanded sample view that you can use to filter your dataset. To view the available filter options for a field, click the caret icon to the right of the field’s name.

Whenever you modify a filter element, the App will automatically update to show only those samples and/or labels that match the filter.

Note

Did you know? When you declare custom attributes on your dataset’s schema, they will automatically become filterable in the App!

Note

Did you know? When you have applied filter(s) in the App, a bookmark icon appears in the top-left corner of the sample grid. Click this button to convert your filters to an equivalent set of stage(s) in the view bar!

Sorting in the grid

You can sort the samples in the grid by selecting a numeric or datetime field from the Sort by dropdown in the upper right corner of the Samples panel.

Note

When Query Performance is enabled, only fields that are indexed can be sorted on.

Managing grid memory usage

When scrolling through the grid, a certain number samples are cached by the App to improve the navigation experience. The number of samples is thresholded by a size estimate in megabytes. The default grid cache size is 1/8 of your device’s memory and only accounts for samples that are not currently visible on your screen.

When autosizing is enabled, the cache size also serves as the threshold for visible items on screen. By default, autosizing is enabled for all datasets and will zoom in on page load or during scrolling, if necessary. When disabled, the setting is persisted to your browser’s storage with respect to the dataset.

Autosizing is particularly useful for high-resolution images and video and dense array data from large Detection and Segmentation masks and Heatmap maps. To disable autosizing, toggle the setting in the settings cog or simply zoom back out with the slider setting.

Optimizing Query Performance

The App’s sidebar is optimized to leverage database indexes whenever possible.

Fields that are indexed are indicated by lightning bolt icons next to their field/attribute names:

The above GIF shows query performance in action on the train split of the BDD100K dataset with an index on the detections.detections.label field:

import fiftyone as fo
import fiftyone.zoo as foz

# The path to the source files that you manually downloaded
source_dir = "/path/to/dir-with-bdd100k-files"

dataset = foz.load_zoo_dataset(
    "bdd100k",
    split="train",
    source_dir=source_dir,
)

dataset.create_index("detections.detections.label")

session = fo.launch_app(dataset)

Note

When filtering by multiple fields, queries will be more efficient when your first filter is on an indexed field.

The SDK provides a number of useful utilities for managing indexes on your datasets:

• list_indexes() - list all existing indexes

• create_index() - create a new index

• drop_index() - drop an existing index

• get_index_information() - get information about the existing indexes

Note

Did you know? With FiftyOne Enterprise you can manage indexes natively in the App via the Query Performance panel.

In general, we recommend indexing only the specific fields that you wish to perform initial filters on:

import fiftyone as fo

dataset = fo.Dataset()

# Index specific top-level fields
dataset.create_index("camera_id")
dataset.create_index("recorded_at")
dataset.create_index("annotated_at")
dataset.create_index("annotated_by")

# Index specific embedded document fields
dataset.create_index("ground_truth.detections.label")
dataset.create_index("ground_truth.detections.confidence")

# Note: it is faster to declare indexes before adding samples
dataset.add_samples(...)

session = fo.launch_app(dataset)

Note

Filtering by frame fields of video datasets is not directly optimizable by creating indexes. Instead, use summary fields to efficiently query frame-level information on large video datasets.

Frame filtering in the App’s grid view can be disabled by setting disable_frame_filtering=True in your App config.

For grouped datasets, you should create a compound index for each field you wish to filter by that includes the field itself and ends with the group slice name. This ensures grid results and counts are performant when filtering by that field and matching on the active slice:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart-groups")

# Index a specific field
dataset.create_index("ground_truth.detections.label")
dataset.create_index([("ground_truth.detections.label", 1), ("group.name", 1)])

session = fo.launch_app(dataset)

For datasets with a small number of fields, you can index all fields by adding a single global wildcard index:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
dataset.create_index("$**")

session = fo.launch_app(dataset)

Warning

For large datasets with many fields, global wildcard indexes may require a substantial amount of RAM and query performance may be degraded compared to selectively indexing a smaller number of fields.

You can also wildcard index all attributes of a specific embedded document field:

# Wildcard index for all attributes of ground truth detections
dataset.create_index("ground_truth.detections.$**")

Note

Numeric field filters are not supported by wildcard indexes.

Compound indexes

With the right indexes configured, the App can support efficient filtering of massive datasets in complex scenarios.

In the simplest case, a single index allows efficient subset creation. If the number of samples matching the initial filter is small enough, you can then refine your search results with additional filters on unindexed fields as necessary.

Compound indexes are useful in situations where you need to perform multiple filters to obtain a sufficiently small working set. Consider the following example:

import fiftyone as fo

dataset = fo.load_dataset("big-image-ds")

dataset.create_index(
    [("ground_truth.label", 1), ("clip_pred.label", 1), ("created_at", 1)]
)

With this compound index created, we can efficiently perform the following multi-stage filtering + sorting operation on a 30M sample dataset.

• Filter by ground_truth.label

• Then filter by clip_pred.label

• Then filter and sort by created_at

The GIF below demonstrates this flow in action:

Note

As filters are applied, fields that are covered by a compound index have their lightning bolt highlighted in solid orange to indicate that filtering by these fields will be performant even if the current number of matching results is large.

Compound indexes can require significant database memory, but they are a powerful tool to support efficient exploration of massive datasets.

Query performant view stages

In addition to the full dataset, Query Performance remains active (lightning bolts visible in the sidebar) when you add the view stages listed below to your view.

For ExcludeFields and SelectFields, index performance applies to all fields still present in the schema.

SelectGroupSlices is query performant. Expect optimal performan when all slices are included in the flattened view.

The GroupBy stage is a query performant stage when order_by and order_by_key values are provided and a compound index exists on the group_by and order_by fields with a unique constraint and at least one index exists that begins with the order_by field. Query performant fields then exist when they follow the order_by in a compound index.

import fiftyone as fo

dataset = fo.load_dataset("frames-as-video")
dataset.create_index([("video", 1), ("frame_number", 1)], unique=True)

# create query performant fields for filtering and sorting
dataset.create_index([("frame_number", 1), ("created_at", 1)])
dataset.create_index([("frame_number", 1), ("last_modified_at", 1)])

# create the "video" view and save it
videos = dataset.group_by(
    "video",
    order_by="frame_number",
    order_by_key=1,
    create_index=False
)
dataset.save_view("videos", videos)

Sidebar filters in the grid now match on the order_by_key sample for each group, i.e. where frame_number is 1 in the above example. Group level metadata is stored on the key sample to efficiently filter on large datasets.

import fiftyone as fo
import random

dataset = fo.load_dataset("frames-as-video")
videos = dataset.load_saved_view("videos")

dataset.create_index([("frame_number", 1), ("group_value", 1)])

# store group level values on the key samples
for poster_sample in videos.iter_samples(autosave=True):
    poster_sample["group_value"] = str(random.randint(0, 51))

Unindexed sidebar results

When Query Performance is enabled, dropdowns and sliders in the sidebar will automatically leverage indexes whenever possible to show the full set/range of values.

If an index is not available, a limited number of samples are scanned to populate dropdowns and sliders, which ensures that the sidebar responds rapidly to your inputs.

Note

By default, a maximum of 10,000 samples are scanned for unindexed fields, but you can customize this via the settings menu (cog icon) above the grid.

As shown in the GIF below, if a sidebar facet leverages a partial scan, you’ll see an indication of this along with a suggestion to create an index if you require full search results for a particular field:

For example, you can enable full search results in the GIF above by creating the following indexes:

import fiftyone as fo

dataset = fo.load_dataset("big-image-ds")

dataset.create_index("yolo8l_coco_torch.detections.confidence")
dataset.create_index("yolo8l_coco_torch.detections.label")

Note

The sidebar can leverage indexes for a field if it has a single index or if there is a compound index whose first field matches.

For example, a ("created_at", "ground_truth.label") compound index provides indexed sidebar results for the created_at field.

Disabling Query Performance

Query Performance is enabled by default for all datasets. This is generally the recommended setting for all large datasets to ensure that queries are performant.

However, in certain circumstances you may prefer to disable Query Performance, which enables the App’s sidebar to show additional information such as label/value counts that are useful but more expensive to compute.

You can disable Query Performance for a particular dataset for its lifetime (in your current browser) via the gear icon in the Samples panel’s actions row:

You can also disable Query Performance by default for all datasets by setting default_query_performance=False in your App config.

Sidebar groups

You can customize the layout of the App’s sidebar by creating/renaming/deleting groups and dragging fields between groups directly in the App:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
session = fo.launch_app(dataset)

Note

Any changes you make to a dataset’s sidebar groups in the App are saved on the dataset and will persist between sessions.

You can also programmatically modify a dataset’s sidebar groups by editing the sidebar_groups property of the dataset’s App config:

# Get the default sidebar groups for the dataset
sidebar_groups = fo.DatasetAppConfig.default_sidebar_groups(dataset)

# Collapse the `metadata` section by default
print(sidebar_groups[2].name)  # metadata
sidebar_groups[2].expanded = False

# Add a new group
sidebar_groups.append(fo.SidebarGroupDocument(name="new"))

# Modify the dataset's App config
dataset.app_config.sidebar_groups = sidebar_groups
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

You can conveniently reset the sidebar groups to their default state by setting sidebar_groups to None:

# Reset sidebar groups
dataset.app_config.sidebar_groups = None
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

Note

If a dataset has fields that do not appear in the dataset’s sidebar_groups property, these fields will be dynamically assigned to default groups in the App at runtime.

Using the view bar

The view bar makes all of the powerful searching, sorting, and filtering operations provided by dataset views available directly in the App.

Note

Any changes to the current view that you make in the view bar are automatically reflected in the DatasetView exposed by the Session.view property of the App’s session object.

Grouping samples

You can use the group action in the App’s menu to dynamically group your samples by a field of your choice:

In this mode, the App’s grid shows the first sample from each group, and you can click on a sample to view all elements of the group in the modal.

You may navigate through the elements of the group either sequentially using the carousel, or randomly using the pagination UI at the bottom of the modal.

When viewing ordered groups, you have an additional option to render the elements of the group as a video.

Field visibility

You can configure which fields of your dataset appear in the App’s sidebar by clicking the settings icon in the upper right of the sidebar to open the Field visibility modal.

Consider the following example:

import fiftyone as fo
import fiftyone.zoo as foz
from datetime import datetime

dataset = foz.load_zoo_dataset("quickstart")
dataset.add_dynamic_sample_fields()

field = dataset.get_field("ground_truth")
field.description = "Ground truth annotations"
field.info = {"creator": "alice", "created_at": datetime.utcnow()}
field.save()

field = dataset.get_field("predictions")
field.description = "YOLOv8 predictions"
field.info = {"owner": "bob", "created_at": datetime.utcnow()}
field.save()

session = fo.launch_app(dataset)

Manual selection

You can use the Selection tab to manually select which fields to display. By default, only top-level fields are available for selection, but if you want fine-grained control you can opt to include nested fields (eg dynamic attributes of your label fields) in the selection list as well.

Note

You cannot exclude default fields/attributes from your dataset’s schema, so these rows are always disabled in the Field visibility UI.

Click Apply to reload the App with only the specified fields in the sidebar. When you do so, a filter icon will appear to the left of the settings icon in the sidebar indicating how many fields are currently excluded. You can reset your selection by clicking this icon or reopening the modal and pressing the Reset button at the bottom.

Note

If your dataset has many fields and you frequently work with different subsets of them, you can persist/reload field selections by saving views.

Filter rules

Alternatively, you can use the Filter rule tab to define a rule that is dynamically applied to the dataset’s field metadata each time the App loads to determine which fields to include in the sidebar.

Note

Filter rules are dynamic. If you save a view that contains a filter rule, the matching fields may increase or decrease over time as you modify the dataset’s schema.

Filter rules provide a simple syntax with different options for matching fields:

Note

All filter rules are implemented as substring matches against the stringified contents of the relevant field metadata.

Color schemes

You can configure the color scheme used by the App to render content by clicking on the color palette icon above the sample grid.

Consider the following example:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
dataset.evaluate_detections(
    "predictions", gt_field="ground_truth", eval_key="eval"
)

session = fo.launch_app(dataset)

Color schemes in the App

The GIF below demonstrates how to:

• Configure a custom color pool from which to draw colors for otherwise unspecified fields/values

• Configure the colors assigned to specific fields in color by field mode

• Configure the colors used to render specific annotations based on their attributes in color by value mode

• Save the customized color scheme as the default for the dataset

Note

Any customizations you make only apply to the current dataset. Each time you load a new dataset, the color scheme will revert to that dataset’s default color scheme (if any) or else the global default color scheme.

To persist a color scheme, you can press Save as default to save the color scheme as the dataset’s default scheme, copy it via the modal’s JSON viewer, or access it programmatically via session.color_scheme as described below.

The following table describes the available color scheme customization options in detail:

Tab	Element	Description
Global settings	Color annotations by	Whether to color the annotations in the grid/modal based on the field that they are in, the value that each annotation takes, or per instance
Global settings	Color pool	A pool of colors from which colors are randomly assigned for otherwise unspecified fields/values
Global settings	Label Opacity	Color opacity of annotations
Global settings	Multicolor keypoints	Whether to independently coloy keypoint points by their index
Global settings	Show keypoints skeletons	Whether to show keypoint skeletons, if available
Global settings	Default mask targets colors	If the MaskTargetsField is defined with integer keys, the dataset can assign a default color based on the integer keys
Global settings	Default colorscale	The default colorscale to use when rendering heatmaps
JSON editor		A JSON representation of the current color scheme that you can directly edit or copy + paste
All	Reset button	Reset the current color scheme to the dataset’s default (if any) or else the global default scheme
All	Save as default button	Save the current color scheme as the default for the current dataset. Note that this scheme can be viewed and/or modified in Python
All	Clear default button	Deletes the current dataset’s default color scheme
FIELD	Use custom colors for FIELD	Allows you to specify a custom color to use whenever rendering any content from that field in the grid/modal when the App is in color by field mode
FIELD	Use custom colors for specific field values	Allows you to specify custom colors to use to render annotations in this field based on the individual values that it takes. In the case of embedded document fields,you must also specify an attribute of each object. For example, color all Classification instances whose label is "car" in #FF0000; Segmentation instances whose mask target integer is 12 in #FF0000; Heatmap instances using hsv colorscale.

Color schemes in Python

You can also programmatically configure a session’s color scheme by creating ColorScheme instances in Python:

# Create a custom color scheme
fo.ColorScheme(
    color_pool=["#ff0000", "#00ff00", "#0000ff", "pink", "yellowgreen"],
    fields=[
        {
            "path": "ground_truth",
            "colorByAttribute": "eval",
            "valueColors": [
                 # false negatives: blue
                {"value": "fn", "color": "#0000ff"},
                # true positives: green
                {"value": "tp", "color": "#00ff00"},
            ]
        },
        {
            "path": "predictions",
            "colorByAttribute": "eval",
            "valueColors": [
                # false positives: red
                {"value": "fp", "color": "#ff0000"},
                 # true positives: green
                {"value": "tp", "color": "#00ff00"},
            ]
        },
        {
            "path": "segmentations",
            "maskTargetsColors": [
                 # 12: red
                {"intTarget": 12, "color": "#ff0000"},
                 # 15: green
                {"intTarget": 15, "color": "#00ff00"},
            ]
        }
    ],
    color_by="value",
    opacity=0.5,
    default_colorscale= {"name": "rdbu", "list": None},
    colorscales=[
        {
             # field definition overrides the default_colorscale
            "path": "heatmap_2",
             # if name is defined, it will override the list
            "name": None,
            "list": [
                {"value": 0.0, "color": "rgb(0,255,255)"},
                {"value": 0.5, "color": "rgb(255,0,0)"},
                {"value": 1.0, "color": "rgb(0,0,255)"},
            ],
        }
    ],
)

Note

Refer to the ColorScheme class for documentation of the available customization options.

You can launch the App with a custom color scheme by passing the optional color_scheme parameter to launch_app():

# Launch App with a custom color scheme
session = fo.launch_app(dataset, color_scheme=color_scheme)

Once the App is launched, you can retrieve your current color scheme at any time via the session.color_scheme property:

print(session.color_scheme)

You can also dynamically edit your current color scheme by modifying it:

# Change the session's current color scheme
session.color_scheme = fo.ColorScheme(...)

# Edit the existing color scheme in-place
session.color_scheme.color_pool = [...]
session.refresh()

Note

Did you know? You can also configure default color schemes for individual datasets via Python!

Saving views

You can use the menu in the upper-left of the App to record the current state of the App’s view bar and filters sidebar as a saved view into your dataset:

Saved views are persisted on your dataset under a name of your choice so that you can quickly load them in a future session via this UI.

Saved views are a convenient way to record semantically relevant subsets of a dataset, such as:

• Samples in a particular state, eg with certain tag(s)

• A subset of a dataset that was used for a task, eg training a model

• Samples that contain content of interest, eg object types or image characteristics

Note

Saved views only store the rule(s) used to extract content from the underlying dataset, not the actual content itself. Saving views is cheap. Don’t worry about storage space!

Keep in mind, though, that the contents of a saved view may change as the underlying dataset is modified. For example, if a save view contains samples with a certain tag, the view’s contents will change as you add/remove this tag from samples.

You can load a saved view at any time by selecting it from the saved view menu:

You can also edit or delete saved views by clicking on their pencil icon:

Note

Did you know? You can also programmatically create, modify, and delete saved views via Python!

Viewing a sample

Click a sample to open an expanded view of the sample. This modal also contains information about the fields of the Sample and allows you to access the raw JSON description of the sample.

If your labels contain many dynamic attributes, you may find it helpful to configure which attributes are shown in the tooltip. To do so, press ctrl while hovering over a label to lock the tooltip in-place and then use the show/hide buttons to customize the display.

Note

Tooltip customizations are persisted in your browser’s local storage on a per-dataset and per-field basis.

Using the image visualizer

The image visualizer allows you to interactively visualize images along with their associated labels. When you hover over an image in the visualizer, a head-up display (HUD) appears with a control bar providing various options.

For example, you can zoom in/out and pan around an image by scrolling and click-dragging with your mouse or trackpad. You can also zoom tightly into the currently visible (or selected) labels by clicking on the Crop icon in the controls HUD or using the z keyboard shortcut. Press ESC to reset your view.

When multiple labels are overlaid on top of each other, the up and down arrows offer a convenient way to rotate the z-order of the labels that your cursor is hovering over, so every label and it’s tooltip can be viewed.

The settings icon in the controls HUD contains a variety of options for customizing the rendering of your labels, including whether to show object labels, confidences, or the tooltip. The default settings for these parameters can be configured via the App config.

Keyboard shortcuts are available for almost every action. Click the ? icon in the controls HUD or use the ? keyboard shortcut to display the list of available actions and their associated hotkeys.

Note

When working in Jupyter/Colab notebooks, you can hold down the SHIFT key when zoom-scrolling or using the arrow keys to navigate between samples/labels to restrict your inputs to the App and thus prevent them from also affecting your browser window.

Using the video visualizer

The video visualizer offers all of the same functionality as the image visualizer, as well as some convenient actions and shortcuts for navigating through a video and its labels.

There are a variety of additional video-specific keyboard shortcuts. For example, you can press the spacebar to play/pause the video, and you can press 0, 1, …, 9 to seek to the 0%, 10%, …, 90% timestamp in the video. When the video is paused, you can use < and > to navigate frame-by-frame through the video.

Click the ? icon in the controls HUD or use the ? keyboard shortcut to display the list of available actions and their associated hotkeys.

All of the same options in the image settings are available in the video settings menu in the controls HUD, as well as additional options like whether to show frame numbers rather than timestamp in the HUD. The default settings for all such parameters can be configured via the App config.

Playback rate and volume are also available in the video controls HUD. Clicking on one of the icons resets the setting to the default. And when hovering, a slider appears to adjust the setting manually.

Note

Did you know? The video visualizer streams frame data on-demand, which means that playback begins as soon as possible and even heavyweight label types like segmentations are supported!

Note

When working in Jupyter/Colab notebooks, you can hold down the SHIFT key when zoom-scrolling or using the arrow keys to navigate between samples/labels to restrict your inputs to the App and thus prevent them from also affecting your browser window.

Using the 3D visualizer

The 3D visualizer allows you to interactively visualize 3D samples or point cloud samples along with any associated 3D detections and 3D polylines:

The table below summarizes the mouse/keyboard controls that the 3D visualizer supports:

Input	Action	Description
Wheel	Zoom	Zoom in and out
Drag	Rotate	Rotate the camera
Shift + drag	Translate	Translate the camera
B	Background	Toggle background on/off
F	Fullscreen	Toggle fullscreen
G	Grid	Toggle the grid on/off
T	Top-down	Reset camera to top-down view
E	Ego-view	Reset the camera to ego view
R	Render	Toggle render preferences
ESC	Escape context	Escape the current context

A variety of context-specific options are available in a draggable panel in the 3D visualizer that let you configure lights, as well as material and visibility of the 3D objects in the scene.

In addition, the HUD at the bottom of the 3D visualizer provides the following controls:

• Click the grid icon to toggle the grid on/off

• Click the T to reset the camera to top-down view

• Click the E to reset the camera to ego-view

For point clouds, when coloring by intensity, the color of each point is computed by mapping the r channel of the rgb field of the PCD file onto a fixed colormap, which is scaled so that the full colormap is matched to the observed dynamic range of r values for each sample.

Similarly, when coloring by height, the z value of each point is mapped to the full colormap using the same strategy.

Dynamic point cloud coloring

FiftyOne supports dynamic coloring of point clouds based on any attribute in your PCD file. This allows you to visualize and analyze point cloud data in powerful ways, such as:

• Working with semantic segmentation data where different classes need distinct colors

• Analyzing LIDAR data where you want to visualize intensity values to identify reflective surfaces

• Inspecting custom attributes like confidence scores or prediction errors

• Comparing multiple attributes by quickly switching between different color schemes

To use dynamic coloring:

1. Press R or click the render preferences icon in the 3D visualizer menu

2. Select the attribute to color by from the “Shade by” dropdown

3. Optionally, override the colormap from the available options by clicking the “Override” button

Colormap selection follows this precedence order:

1. Colormap from browser storage (if previously overridden)

2. Colormap defined in the colorscales property of the dataset’s App config for the specific attribute

3. Colormap defined in the default_colorscale property of the dataset’s App config

4. Default colormap (red-to-blue gradient)

You can override the colormap for any attribute by clicking the “Override” button in the render preferences panel. This will open a new UI where you can:

• Add or remove color stops

• Preview the gradient

• Reset to the app config or default colormap

Note

Colormap overrides are persisted in your browser’s local storage, so they will be remembered across sessions.

You can define default colormaps for point cloud attributes of a dataset by configuring them in the dataset’s App config. You must use the prefix ::fo3d::pcd:: followed by the attribute name in the path field. For example, to define a colormap for the lidar_id attribute, the path should be ::fo3d::pcd::lidar_id:

import fiftyone as fo

dataset = fo.load_dataset(...)

# Configure colormaps for point cloud attributes
dataset.app_config.color_scheme = fo.ColorScheme(
    colorscales=[
        {
            "path": "::fo3d::pcd::lidar_id",
            "name": "viridis",  # use a named colormap
        },
        {
            "path": "::fo3d::pcd::intensity",
            "list": [  # or define a custom colormap
                {"value": 0, "color": "rgb(0, 0, 255)"},
                {"value": 1, "color": "rgb(0, 255, 255)"},
            ],
        },
    ],
    default_colorscale={"name": "jet"},  # default for other attributes
)
dataset.save()

When visualizing point clouds with dynamic attributes, you can apply thresholding to focus on specific value ranges. This is particularly useful for:

• Filtering out noise or outliers in your data

• Isolating points of interest based on their attribute values

• Analyzing specific ranges of values in your point cloud

To use thresholding:

1. Press R or click the render preferences icon in the 3D visualizer menu

2. Select the attribute to color by from the “Shade by” dropdown

3. Use the threshold slider that appears below the colormap controls

4. Adjust the minimum and maximum values to show only points within that range

The threshold slider shows the full range of values for the selected attribute, and points outside the selected range will be hidden from view.

Note

Thresholding is available for all numeric attributes except height and RGB values. The threshold range is automatically adjusted based on the data type of the attribute (integer or float).

Viewing 3D samples in the grid

When you load 3D collections in the App, any 3D detections and 3D polylines fields will be visualized in the grid using an orthographic projection (onto the xy plane by default).

In addition, if you have populated orthographic projection images on your dataset, the projection images will be rendered for each sample in the grid:

import fiftyone as fo
import fiftyone.utils.utils3d as fou3d
import fiftyone.zoo as foz

# Load an example 3D dataset
dataset = (
    foz.load_zoo_dataset("quickstart-groups")
    .select_group_slices("pcd")
    .clone()
)

# Populate orthographic projections
fou3d.compute_orthographic_projection_images(dataset, (-1, 512), "/tmp/proj")

session = fo.launch_app(dataset)

Configuring the 3D visualizer

The 3D visualizer can be configured by including any subset of the settings shown below under the plugins.3d key of your App config:

// The default values are shown below
{
    "plugins": {
        "3d": {
            // Whether to show the 3D visualizer
            "enabled": true,

            // The initial camera position in the 3D scene
            "defaultCameraPosition": {"x": 0, "y": 0, "z": 0},

            // The default up direction for the scene
            "defaultUp": [0, 0, 1],

            "pointCloud": {
                // Don't render points below this z value
                "minZ": null
            }
        }
    }
}

You can also store dataset-specific plugin settings by storing any subset of the above values on a dataset’s App config:

# Configure the 3D visualizer for a dataset's PCD/Label data
dataset.app_config.plugins["3d"] = {
    "defaultCameraPosition": {"x": 0, "y": 0, "z": 100},
}
dataset.save()

Note

Dataset-specific plugin settings will override any settings from your global App config.

Linking labels

FiftyOne provides a mechanism to link related labels together, such as the same object instance observed across multiple frames of a video or across different slices of a grouped dataset.

This linking is achieved by assigning the same Instance to the instance attribute of the relevant Detection, Keypoint, or Polyline objects:

import fiftyone as fo

# Create instance representing a logical object
person_instance = fo.Instance()

detection1 = fo.Detection(
    label="person",
    bounding_box=[0.1, 0.1, 0.2, 0.2],
    instance=person_instance,  # link this detection
)

detection2 = fo.Detection(
    label="person",
    bounding_box=[0.12, 0.11, 0.2, 0.2],
    instance=person_instance,  # link this detection
)

When labels are linked via their instance attribute, the App provides enhanced visualizations and interactions:

• Visual linking (on hover): when you hover over a label that is part of an instance group, all other labels belonging to the same instance (across frames or group slices) will be highlighted with a white border

• Bulk selection (shift + click): when you hold the shift key and click on a label that is part of an instance group, you will select or deselect all labels belonging to that same instance in bulk. This is particularly useful for tasks like reviewing or tagging all occurrences of a specific object instance quickly

Video datasets

In video datasets, label correspondence helps track objects over time.

Hovering over a detection in one frame can highlight the same detected object in other frames. Shift-clicking allows for selecting/deselecting all instances of that object throughout the relevant frames of the video:

Grouped datasets

In grouped datasets, label correspondence links the same object viewed from different perspectives (group slices).

Hovering over an object in one camera view can highlight its corresponding occurrences in other camera views within the same group. Shift-clicking enables bulk selection/deselection of these corresponding objects across the group slices:

Spaces

Spaces provide a customizable framework for organizing interactive Panels of information within the App.

FiftyOne natively includes the following Panels:

• Samples panel: the media grid that loads by default when you launch the App

• Embeddings panel: a canvas for working with embeddings visualizations

• Model Evaluation panel: interactively analyze and visualize your model’s performance

• Map panel: visualizes the geolocation data of datasets that have a GeoLocation field

• Histograms panel: a dashboard of histograms for the fields of your dataset

Note

You can also configure custom Panels via plugins!

Configuring spaces in the App

Consider the following example dataset:

import fiftyone as fo
import fiftyone.brain as fob
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
fob.compute_visualization(dataset, brain_key="img_viz")

session = fo.launch_app(dataset)

You can configure spaces visually in the App in a variety of ways described below.

Click the + icon in any Space to add a new Panel:

When you have multiple Panels open in a Space, you can use the divider buttons to split the Space either horizontally or vertically:

You can rearrange Panels at any time by dragging their tabs between Spaces, or close Panels by clicking their x icon:

Configuring spaces in Python

You can also programmatically configure your Space layout and the states of the individual Panels via the Space and Panel classes in Python, as shown below:

samples_panel = fo.Panel(type="Samples", pinned=True)

histograms_panel = fo.Panel(
    type="Histograms",
    state=dict(plot="Labels"),
)

embeddings_panel = fo.Panel(
    type="Embeddings",
    state=dict(brainResult="img_viz", colorByField="metadata.size_bytes"),
)

spaces = fo.Space(
    children=[
        fo.Space(
            children=[
                fo.Space(children=[samples_panel]),
                fo.Space(children=[histograms_panel]),
            ],
            orientation="horizontal",
        ),
        fo.Space(children=[embeddings_panel]),
    ],
    orientation="vertical",
)

The children property of each Space describes what the Space contains, which can be either:

• A list of Space instances. In this case, the Space contains a nested list of Spaces, arranged either horizontally or vertically, as per the orientation property of the parent Space

• A list of Panel instances describing the Panels that should be available as tabs within the Space

Set a Panel’s pinned property to True if you do not want a Panel’s tab to have a close icon x in the App. Each Panel also has a state dict that can be used to configure the specific state of the Panel to load. Refer to the sections below for each Panel’s available state.

You can launch the App with an initial spaces layout by passing the optional spaces parameter to launch_app():

# Launch the App with an initial Spaces layout
session = fo.launch_app(dataset, spaces=spaces)

Once the App is launched, you can retrieve your current layout at any time via the session.spaces property:

print(session.spaces)

You can also programmatically configure the App’s current layout by setting session.spaces to any valid Space instance:

# Change the session's current Spaces layout
session.spaces = spaces

Note

Inspecting session.spaces of a session whose Spaces layout you’ve configured in the App is a convenient way to discover the available state options for each Panel type!

You can reset your spaces to their default state by setting session.spaces to None:

# Reset spaces layout in the App
session.spaces = None

Saving workspaces

If you find yourself frequently using/recreating a certain spaces layout, you can save it as a workspace with a name of your choice and then load it later via the App or programmatically!

Saving workspaces in the App

Continuing from the example above, once you’ve configured a spaces layout of interest, click the “Unsaved workspace” icon in the upper right corner to open the workspaces menu and save your current workspace with a name and optional description/color of your choice:

Note

Saved workspaces include all aspects of your current spaces layout, including panel types, layouts, sizes, and even the current state of each panel!

You can load saved workspaces at any time later via this same menu:

You can also edit the details of an existing saved workspace at any time by clicking on its pencil icon in the workspace menu:

Note

If you want to modify the layout of an existing saved workspace, you must delete the existing workspace and then re-save it under the same name after modifying the layout in the App.

Saving workspaces in Python

You can also programmatically create and manage saved workspaces!

Use save_workspace() to create a new saved workspace with a name of your choice:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

samples_panel = fo.Panel(type="Samples", pinned=True)

histograms_panel = fo.Panel(
    type="Histograms",
    state=dict(plot="Labels"),
)

embeddings_panel = fo.Panel(
    type="Embeddings",
    state=dict(brainResult="img_viz", colorByField="metadata.size_bytes"),
)

workspace = fo.Space(
    children=[
        fo.Space(
            children=[
                fo.Space(children=[samples_panel]),
                fo.Space(children=[histograms_panel]),
            ],
            orientation="horizontal",
        ),
        fo.Space(children=[embeddings_panel]),
    ],
    orientation="vertical",
)

dataset.save_workspace(
    "my-workspace",
    workspace,
    description="Samples, embeddings, histograms, oh my!",
    color="#FF6D04",
)

Note

Pro tip! You can save your current spaces layout in the App via session.spaces:

workspace = session.spaces
dataset.save_workspace("my-workspace", workspace, ...)

Then in a future session you can load the workspace by name with load_workspace():

import fiftyone as fo

dataset = fo.load_dataset("quickstart")

# Retrieve a saved workspace and launch app with it
workspace = dataset.load_workspace("my-workspace")
session = fo.launch_app(dataset, spaces=workspace)

# Or, load a workspace on an existing session
session.spaces = workspace

Saved workspaces have certain editable metadata such as a name, description, and color that you can view via get_workspace_info() and update via update_workspace_info():

# Get a saved workspace's editable info
print(dataset.get_workspace_info("my-workspace"))

# Update the workspace's name and add a description
info = dict(
    name="still-my-workspace",
    description="Samples, embeddings, histograms, oh my oh my!!",
)
dataset.update_workspace_info("my-workspace", info)

# Verify that the info has been updated
print(dataset.get_workspace_info("still-my-workspace"))
# {
#   'name': 'still-my-workspace',
#   'description': 'Samples, embeddings, histograms, oh my oh my!!',
#   'color': None
# }

You can also use list_workspaces(), has_workspace(), and delete_workspace() to manage your saved workspaces.

Samples panel

By default, when you launch the App, your spaces layout will contain a single space with the Samples panel active:

When configuring spaces in Python, you can create a Samples panel as follows:

samples_panel = fo.Panel(type="Samples")

Embeddings panel

When you load a dataset in the App that contains an embeddings visualization, you can open the Embeddings panel to visualize and interactively explore a scatterplot of the embeddings in the App:

import fiftyone as fo
import fiftyone.brain as fob
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

# Image embeddings
fob.compute_visualization(dataset, brain_key="img_viz")

# Object patch embeddings
fob.compute_visualization(
    dataset, patches_field="ground_truth", brain_key="gt_viz"
)

session = fo.launch_app(dataset)

Use the two menus in the upper-left corner of the Panel to configure your plot:

• Brain key: the brain key associated with the compute_visualization() run to display

• Color by: an optional sample field (or label attribute, for patches embeddings) to color the points by

From there you can lasso points in the plot to show only the corresponding samples/patches in the Samples panel:

Note

Did you know? With FiftyOne Enterprise you can generate embeddings visualizations natively from the App in the background while you work.

The embeddings UI also provides a number of additional controls:

• Press the pan icon in the menu (or type g) to switch to pan mode, in which you can click and drag to change your current field of view

• Press the lasso icon (or type s) to switch back to lasso mode

• Press the locate icon to reset the plot’s viewport to a tight crop of the current view’s embeddings

• Press the x icon (or double click anywhere in the plot) to clear the current selection

When coloring points by categorical fields (strings and integers) with fewer than 100 unique classes, you can also use the legend to toggle the visibility of each class of points:

• Single click on a legend trace to show/hide that class in the plot

• Double click on a legend trace to show/hide all other classes in the plot

When configuring spaces in Python, you can define an Embeddings panel as follows:

embeddings_panel = fo.Panel(
    type="Embeddings",
    state=dict(brainResult="img_viz", colorByField="uniqueness"),
)

The Embeddings panel supports the following state parameters:

• brainResult: the brain key associated with the compute_visualization() run to display

• colorByField: an optional sample field (or label attribute, for patches embeddings) to color the points by

Model Evaluation panel NEW

When you load a dataset in the App that contains one or more evaluations, you can open the Model Evaluation panel to visualize and interactively explore the evaluation results in the App:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

# Evaluate the objects in the `predictions` field with respect to the
# objects in the `ground_truth` field
results = dataset.evaluate_detections(
    "predictions",
    gt_field="ground_truth",
    eval_key="eval",
)

session = fo.launch_app(dataset)

The panel’s home page shows a list of evaluation on the dataset, their current review status, and any evaluation notes that you’ve added. Click on an evaluation to open its expanded view, which provides a set of expandable cards that dives into various aspects of the model’s performance:

Note

Did you know? With FiftyOne Enterprise you can execute model evaluations natively from the App in the background while you work.

Review status

You can use the status pill in the upper right-hand corner of the panel to toggle an evaluation between Needs Review, In Review, and Reviewed:

Evaluation notes

The Evaluation Notes card provides a place to add your own Markdown-formatted notes about the model’s performance:

Summary

The Summary card provides a table of common model performance metrics. You can click on the grid icons next to TP/FP/FN to load the corresponding labels in the Samples panel:

Metric performance

The Metric Performance card provides a graphical summary of key model performance metrics:

Class performance

The Class Performance card provides a per-class breakdown of each model performance metric. If an evaluation contains many classes, you can use the settings menu to control which classes are shown. The histograms are also interactive: you can click on bars to show the corresponding labels in the Samples panel:

Confusion matrices

The Confusion Matrices card provides an interactive confusion matrix for the evaluation. If an evaluation contains many classes, you can use the settings menu to control which classes are shown. You can also click on cells to show the corresponding labels in the Samples panel:

Comparing models

When a dataset contains multiple evaluations, you can compare two model’s performance by selecting a “Compare against” key:

model = foz.load_zoo_model("yolo11s-coco-torch")

dataset.apply_model(model, label_field="predictions_yolo11")

dataset.evaluate_detections(
    "predictions_yolo11",
    gt_field="ground_truth",
    eval_key="eval_yolo11",
)

session.refresh()

Scenario analysis NEW

When evaluating models, it is often useful to deep dive into the behavior of your models in different scenarios. This technique can be extremely useful in a number of ways, including to:

• Uncover edge cases that need more representation in your training data

• Identify annotation mistakes that are confusing or misleading your model

• Understand model performance in different contexts

• Gain intuition about the strengths and weaknesses of your model based on properties of its predictions

• Compare and contrast model performance under different input data and/or prediction characteristics

Scenario analysis is available for all evaluations by clicking on the Scenario Analysis tab of the Model Evaluation panel.

Example dataset

The rest of the content in this section is applied to the following dataset:

import fiftyone as fo
import fiftyone.zoo as foz
from fiftyone import ViewField as F

# Load a dataset with `ground_truth` and `predictions` fields
dataset = foz.load_zoo_dataset("quickstart")

# Declare the `iscrowd` attribute on the "ground_truth" field
dataset.add_dynamic_sample_fields()

# Evaluate the `predictions` field
results = dataset.evaluate_detections(
    "predictions",
    gt_field="ground_truth",
    eval_key="eval",
)

# Add some additional model predictions in the `predictions_yolo11` field
model = foz.load_zoo_model("yolo11s-coco-torch")
dataset.apply_model(model, label_field="predictions_yolo11")

# Evaluate the `predictions_yolo11` field
dataset.evaluate_detections(
    "predictions_yolo11",
    gt_field="ground_truth",
    eval_key="eval_yolo11",
)

# Classify each image as `indoor` or `outdoor`
model = foz.load_zoo_model(
    "clip-vit-base32-torch",
    text_prompt="An image that is",
    classes=["indoor", "outdoor"],
)
dataset.apply_model(model, label_field="scene")

# Create some saved views
dataset.save_view("indoor scenes", dataset.match(F("scene.label") == "indoor"))
dataset.save_view("outdoor scenes", dataset.match(F("scene.label") == "outdoor"))

session = fo.launch_app(dataset)

Defining scenarios

When you first open the Scenario Analysis tab in the Model Evaluation panel, you’ll be prompted to create your first scenario:

The scenario creation modal will prompt you to provide a name for the scenario, which will be used to identify the scenario subsequently in the panel, for example when switching between scenarios.

Each scenario is composed of multiple subsets that partition the ground truth labels involved in the evaluation into different semantically meaningful sets of interest. FiftyOne supports four methods to define subsets:

• Sample field: partition at the sample-level by defining subsets based on the values that a particular sample field takes

• Label attribute: partition at the label-level by defining subsets based on the values that a particular attribute of the ground truth labels takes

• Saved views: define subsets based on the ground truth labels in a list of saved views

• Custom code: use custom code to define subsets based on arbitrary Python expressions and/or combinations of the above methods

When distribution preview is enabled, you’ll see a histogram that represents the number of ground truth labels in each subset of the scenario you’re defining. This preview will automatically update as you continue adding/refining your subsets, which allows you to visually confirm that the subsets that you’re defining have the contents that you expect.

Once you’re happy with the scenario’s definition, click the Analyze scenario button in the bottom-right of the modal to create it.

The following subsections describe how to use each of the four scenario definition types in detail.

Select sample field

Selecting a sample field allows you to define a scenario whose subsets contain samples for which the specified field takes certain values.

For example, choosing the scene.label sample field allows us to define a scenario that contains two subsets:

• Samples whose scene.label field is indoor

• Samples whose scene.label field is outdoor

As you can see in the Distribution preview, each subset is assigned a name based on the field value that its member samples take.

Note

If you select a sample field that contains numeric values, or a categorical field that contains many distinct values, you will be prompted to define the subsets via custom code rather than by selecting values via checkboxes or a multiselect list.

Select label attribute

Selecting a label attribute allows you to define a scenario whose subsets contain samples for which the specified attribute of the ground truth labels takes certain values.

For example, choosing the iscrowd attribute allows us to define a scenario that contains two subsets:

• Labels whose iscrowd attribute is 0

• Labels whose iscrowd attribute is 1

If you choose a categorical label attribute, each subset is assigned a name based on the field value that its member labels take.

Note

If you select a label attribute that contains numeric values, or a categorical attribute that contains many distinct values, you will be prompted to define the subsets via custom code rather than by selecting values via checkboxes or a multiselect list.

Select saved views

Selecting saved views allows you to define a scenario where each subset contains the ground truth labels in a specified saved view.

For example, in the example below we define a scenario that contains two subsets:

• Samples in the indoor scenes saved view

• Samples in the outdoor scenes saved view

As you can see in the Distribution preview above, each subset is assigned the name of the saved view that defines it.

Custom code

The most flexible option for constructing a scenario is to define its subsets via Python code.

By default, toggling to custom code mode for an object detection task inserts subset definitions that partition the ground truth labels based on their size relative to the image in which they reside:

• Small objects: labels whose size is less than 5% of the image

• Medium objects: labels whose size is between 5% and 50% of the image

• Large objects: labels whose size is greater than 50% of the image

from fiftyone import ViewField as F

bbox_area = F("bounding_box")[2] * F("bounding_box")[3]
subsets = {
    "Small objects": dict(type="attribute", expr=bbox_area < 0.05),
    "Medium objects": dict(type="attribute", expr=(0.05 <= bbox_area) & (bbox_area <= 0.5)),
    "Large objects": dict(type="attribute", expr=bbox_area > 0.5),
}

You could also define subsets based on the area of the object in pixels via the following subset definitions like so:

from fiftyone import ViewField as F

bbox_area = (
    F("bounding_box")[2] * F("$metadata.frame_height")
    * F("bounding_box")[3] * F("$metadata.frame_width")
)

subsets = {
    "Small objects": dict(type="attribute", expr=bbox_area < 32**2),
    "Medium objects": dict(type="attribute", expr=(32**2 <= bbox_area) & (bbox_area <= 96**2)),
    "Large objects": dict(type="attribute", expr=bbox_area > 96**2),
}

In general, the custom code option expects you to define the scenario by providing a dict called subsets that maps scenario names to scenario definitions:

from fiftyone import ViewField as F

subsets = {
    "<subset_name>": subset_def,
    ...
}

where each subset_def can refer to sample fields, label attributes, saved views, or a combination thereof to define the subset using the syntax described below:

Sample field value

Sample field expression

Label attribute value

Label attribute expression

Saved view

Compound criteria

# Subset defined by a sample field value
subset_def = {
    "type": "sample",
    "field": "timeofday",
    "value": "night",
}

# Subset defined by a sample field expression
subset_def = {
    "type": "field",
    "expr": F("uniqueness") > 0.75,
}

# Subset defined by a label attribute value
subset_def = {
    "type": "attribute",
    "field": "type",
    "value": "sedan",
}

# Subset defined by a label expression
bbox_area = F("bounding_box")[2] * F("bounding_box")[3]
subset_def = {
    "type": "attribute",
    "expr": (0.05 <= bbox_area) & (bbox_area <= 0.5),
}

# Subset defined by a saved view
subset_def = {
    "type": "view",
    "view": "night_view",
}

# Compound subset defined by a sample field value + sample expression
subset_def = [
    {
        "type": "field",
        "field": "timeofday",
        "value": "night",
    },
    {
        "type": "field",
        "expr": F("uniqueness") > 0.75,
    },
]

# Compound subset defined by a sample field value + label expression
bbox_area = F("bounding_box")[2] * F("bounding_box")[3]
subset_def = [
    {
        "type": "field",
        "field": "timeofday",
        "value": "night",
    },
    {
        "type": "attribute",
        "expr": (0.05 <= bbox_area) & (bbox_area <= 0.5),
    },
]

# Compound subset defined by a saved view + label attribute value
subset_def = [
    {
        "type": "view",
        "view": "night_view",
    },
    {
        "type": "attribute",
        "field": "type",
        "value": "sedan",
    }
]

Note

Refer to the ViewExpression docs for a full list of supported operations when using expressions to define subsets.

Analyzing scenarios

Once a scenario is created, you’ll see an array of graphs that describe various dimensions of the model(s) performance across each subset in the scenario.

As with the Overview tab, you can select one evaluation to analyze, or you can select two evaluations to compare, in which case there will be two series/columns in each graph/table as relevant.

Each scenario analysis contains the following charts:

• Prediction Statistics: this stacked bar chart shows the number of true positives, false positives, and false negatives for each model across each subset

• Model Performance: this radar chart visually depicts each model(s) performance on a particular subset across standard metrics like precision, recall, F1 score, average confidence, and IoU (as relevant). Use the selector in the upper-right corner to toggle between subsets

• Confusion Matrices: these heatmap(s) display standard confusion matrices for each model(s) on a particular subset. Use the selector in the upper-right corner to toggle between subsets

• Confidence Distribution: this chart depicts the distribution of prediction confidences for each model across each subset

• Metric Performance: a variation on the Model Performance chart that displays each model(s) performance across subsets for a particular metric. Use the selector in the upper-right corner to toggle between metrics of interest

• Subset Distribution: this histogram shows the number of labels generated by each model in each subset

All applicable charts are interactive, meaning that you can click on specific bars or cells of interest to load the corresponding samples in the grid!

You can also view the results in tabular form by clicking the table icon in the upper right corner of the Scenario Analysis tab:

Updating scenarios

Once generated, a scenario’s results are cached until the model evaluation is deleted or the scenario is edited. However, if the underlying dataset has changed in such a way that the samples/ground truth labels in a scenario has changed, you can click the refresh button at any time to regenerate the scenario’s results:

You can also create additional scenarios at any time by clicking the + button:

And you can edit or delete an existing scenario by selecting Edit or Delete under the kebab menu:

Map panel

When you load a dataset in the App that contains a GeoLocation field with point data populated, you can open the Map panel to visualize and interactively explore a scatterplot of the location data:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart-geo")

session = fo.launch_app(dataset)

Note

You must configure a Mapbox access token in order to use the Map UI. See below for instructions.

FiftyOne uses the Mapbox GL JS API, which is free up to 50,000 map loads each month.

You can lasso points in the map to show only the corresponding data in the Samples panel. Confirm the selection by either double-clicking the last vertex or typing enter:

The map UI also provides a number of additional controls:

• Use the menu in the upper-left corner to choose between the available map types

• Press the locate icon to reset the map’s viewport to a tight crop of the current view’s location data

• Press the x icon to clear the current selection

When configuring spaces in Python, you can define a Map panel as follows:

map_panel = fo.Panel(type="Map")

Additionally, the map UI can be configured by including any subset of the settings shown below under the plugins.map key of your App config:

// The default values are shown below
{
    "plugins": {
        "map": {
            // Your mapbox token. This is required
            "mapboxAccessToken": "XXXXXXXX",

            // Whether to enable clustering
            "clustering": true,

            // Never use clustering beyond this zoom level
            // https://docs.mapbox.com/help/glossary/zoom-level
            "clusterMaxZoom": 11,

            // Controls the look and feel of clusters
            "clusters": {
                "paint": {
                    "circle-color": "rgb(244, 113, 6)",
                    "circle-opacity": 0.7,

                    // Step expressions can be used
                    // https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions-step
                    // 20px circles when point count is less than 10
                    // 30px circles when point count is between 10 and 25
                    // 40px circles when point count is greater than or equal to 25
                    "circle-radius": ["step", ["get", "point_count"], 20, 10, 30, 25, 40]
                }
            },

            // Controls the look and feel of individual scatter points
            "pointPaint": {
                "circle-color": "rgb(244, 113, 6)",
                "circle-opacity": 0.7,
                "circle-radius": 4
            }
        }
    }
}

If you prefer, you can provide your Mapbox token by setting the MAPBOX_TOKEN environment variable:

export MAPBOX_TOKEN=XXXXXXXX

You can also store dataset-specific plugin settings by storing any subset of the above values on a dataset’s App config:

# Disable clustering for this dataset
dataset.app_config.plugins["map"] = {"clustering": False}
dataset.save()

Note

Dataset-specific plugin settings will override any settings from your global App config.

Histograms panel

The Histograms panel in the App lets you visualize different statistics about the fields of your dataset.

• The Sample tags and Label tags modes show the distribution of any tags that you’ve added to your dataset

• The Labels mode shows the class distributions for each labels field that you’ve added to your dataset. For example, you may have histograms of ground truth labels and one more sets of model predictions

• The Other fields mode shows distributions for numeric (integer or float) or categorical (e.g., string) primitive fields that you’ve added to your dataset. For example, if you computed uniqueness on your dataset, a histogram of uniqueness values will be available under this mode.

Note

The statistics in the plots automatically update to reflect the current view that you have loaded in the App!

When configuring spaces in Python, you can define a Histograms panel as follows:

histograms_panel = fo.Panel(type="Histograms", state=dict(plot="Labels"))

The Histograms panel supports the following state parameters:

• plot: the histograms to plot. Supported values are "Sample tags", "Label tags", "Labels", and "Other fields"

Selecting content

The App supports selecting content such as samples or specific labels, which is useful to take contextual actions like tagging on only the selected content.

Selecting samples

As previously explained, the Session object created when you launch the App lets you interact with the App from your Python process.

One common workflow is to select samples visually in the App and then access the data for the selected samples in Python. To perform this workflow, first select some samples in the App:

The selected samples checkmark in the options row in the upper-left corner of the sample grid records the number of samples that you have currently selected. You can also take actions such as updating the view to only show (or exclude) the currently selected samples.

Tagging also automatically applies to selected samples or their labels when any samples are selected. See tagging for more details.

You can also access the Session.selected property of your session to retrieve the IDs of the currently selected samples in the App:

# Print the IDs of the currently selected samples
print(session.selected)

# Create a view containing only the selected samples
selected_view = dataset.select(session.selected)

['5ef0eef405059ebb0ddfa6cc',
 '5ef0eef405059ebb0ddfa7c4',
 '5ef0eef405059ebb0ddfa86e',
 '5ef0eef405059ebb0ddfa93c']

Selecting labels

You can also select individual labels within samples in the App, which is useful for a variety of reasons:

• Visually show/hide labels of interest in the App

• Take contextual actions such as tagging on only the selected labels

• Access the data for selected labels from Python, for example by creating a DatasetView that includes/excludes the selected labels

To perform this workflow, open the expanded sample view by clicking on a sample in the App. Then click on individual labels to select them:

Selected labels will appear with dotted lines around them. The example above shows selecting an object detection, but classifications, polygons, polylines, segmentations, and keypoints can be selected as well.

When you have selected labels in the App, you can use the selected labels options in the upper-right (the orange checkmark button) to hide these labels from view or exclude all other labels.

You can also access the Session.selected_labels property of your session to retrieve information about the currently selected labels in the App:

# Print information about the currently selected samples in the App
fo.pprint(session.selected_labels)

# Create a view containing only the selected labels
selected_view = dataset.select_labels(session.selected_labels)

# Create a view containing everything except the selected labels
excluded_view = dataset.exclude_labels(session.selected_labels)

[
    {
        'label_id': '5f99d2eb36208058abbfc02a',
        'sample_id': '5f99d2eb36208058abbfc030',
        'field': 'ground_truth',
    },
    {
        'label_id': '5f99d2eb36208058abbfc02b',
        'sample_id': '5f99d2eb36208058abbfc030',
        'field': 'ground_truth',
    },
    ...
]

If you are working with a dataset that leverages linked labels, you can shift + click on a label to select/deselect all instances of that object across video frames or group slices of the dataset:

import fiftyone as fo
import fiftyone.zoo as foz
import fiftyone.utils.labels as foul

dataset = foz.load_zoo_dataset("quickstart-video")
foul.index_to_instance(dataset, "frames.detections", clear_index=True)

session = fo.launch_app(dataset)

Note

Did you know? You can switch to “Color by instance” mode in the Color scheme editor to view each instance’s trajectory in a distinct color.

Persistent selections

By default, selection of samples and/or labels in the App are persisted for the duration of the App session:

To clear selections, you can click the selection menu button and choose one of the following options.

When in grid view:

• Clear selected samples will clear all sample selections

• Clear selected labels will clear all label selections

• Only show selected samples will only show the selected samples

• Hide selected samples will hide the selected samples

When in expanded sample mode:

• Select visible (current sample) will select all visible labels in the current sample

• Unselect visible (current sample) will unselect all visible labels in the current sample

• Clear selected labels will clear all label selections

• Hide selected labels will hide the selected labels

• Hide unselected labels (current sample) will hide the unselected labels

Tags and tagging

Tagging is a first-class citizen in FiftyOne, as both Sample and Label instances have a tags attribute that you can use to store arbitrary string tags for your data.

The FiftyOne API provides methods like tag_samples() and tag_labels() that you can use to programmatically manage the tags on your dataset. However, the App also provides a convenient UI for interactively adding, removing, and filtering by Sample and Label tags.

You can tag or untag batches of samples/labels in the App by clicking on the tag icon above the sample grid.

For example, take the following steps to tag all labels in the predictions field of a dataset:

• Make sure that predictions is the only Label field checked in the filters sidebar

• Click the tag icon in the top-left corner of the grid

• Select Labels, type in the tag, and then click Apply

You can also use the tag menu to remove existing tags.

Note

Any tagging operations that you perform using the tagging UI above the sample grid will be applied to your current view, respecting any filters or show/hide checkboxes you have applied in the filters sidebar, unless you have selected individual samples, in which case the operation will only apply to the selected samples.

The App also supports tagging data in individual samples when you have opened the expanded sample view by clicking on a sample. The tag icon is located in the top-right corner of the modal.

Note

Any tagging operations that you perform using the tagging UI in expanded sample mode will be applied to the current sample, respecting any filters or show/hide checkboxes you have applied, unless you have selected individual labels, in which case the operation will only apply to the selected labels. The latter may span multiple samples.

If your dataset has sample or label tags, you can use the SAMPLE TAGS and LABEL TAGS sections of the filters sidebar to filter by your tags.

When you click the eye icon next to a sample tag, your view will update to only include samples with the tag(s) you have selected. When you click the eye icon next to a label tag, your view will update to only include labels with tag(s) you have selected, and any samples with no matches will be automatically excluded.

Note

Did you know? When you have applied filter(s) in the App, a save icon appears in the top-left corner of the sample grid. Clicking this button will convert your filters to an equivalent set of stage(s) in the view bar!

Viewing object patches

Whenever you load a dataset in the App that contains label list fields in Detections or Polylines format, you can use the patches menu to create a view into your data that contains one sample per object patch in a specified label field of your dataset.

To switch to patches view, simply click the patches icon above the sample grid in the App, toggle to the Labels submenu, and then choose the field whose object patches you want to view. After you make a selection, a new ToPatches view stage will be appended to the view bar and your view will be updated to show the patches.

By default, patches are cropped so only the label patch is visible, but you can zoom in/out and pan as desired in the image visualizer. If you would like to see the entire image for each patch by default, click on the settings icon and uncheck the Crop to patch setting. The setting is available in both the grid and expanded sample view.

Note

Switching to patches view will create patches for only the contents of your current view, so you can use the view bar and the filters sidebar to select only the content of interest prior to extracting patches.

You can interact with object patches views in the App just like you would with any other view, including:

• You can filter and transform objects patches views using the filter sidebar or the view bar

• Any modifications to patch label tags that you make via the tagging menu will be reflected on the source dataset

One notable exception is that tagging or untagging patches themselves (as opposed to their labels) will not affect the sample tags of the underlying Sample.

Note

Did you know? You can construct object patches views programmatically via dataset views!

Viewing evaluation patches

Whenever you load a dataset in the App that contains object detections on which you have run evaluation, you can use the patches menu to create a view into your data that contains one sample for each true positive, false positive, and false negative example.

To switch to evaluation patches view, simply click the patches icon above the sample grid in the App, toggle to the Evaluations submenu, and then choose the eval_key under which you saved the evaluation results that you want view. After you make a selection, a new ToEvaluationPatches view stage will be appended to the view bar and your view will be updated to show the evaluation patches!

By default, evaluation patches are cropped so only the label(s) that make up the patch are visible, but you can zoom in/out and pan as desired in the image visualizer. If you would like to see the entire image for each patch by default, click on the settings icon and uncheck the Crop to patch setting. The setting is available in both the grid and expanded sample view.

Note

Refer to the evaluation guide guide for more information about running evaluations and using evaluation patches views to analyze object detection models.

You can interact with evaluation patches views in the App just like you would with any other view, including:

• You can filter and transform evaluation patches views using the filter sidebar or the view bar

• Any modifications to the tags of the ground truth or predicted labels that you make via the tagging menu will be reflected on the source dataset

One notable exception is that tagging or untagging patches themselves (as opposed to their labels) will not affect the sample tags of the underlying Sample.

Note

Switching to evaluation patches view will generate patches for only the contents of the current view, which may differ from the view on which the eval_key evaluation was performed. This may exclude some labels that were evaluated and/or include labels that were not evaluated.

If you would like to see patches for the exact view on which an evaluation was performed, first call load_evaluation_view() to load the view and then convert to patches.

Viewing video clips

Whenever you load a video dataset in the App that contains TemporalDetection labels or frame-level label lists such as Detections, you can use the patches menu to create a view into your data that contains one sample per clip defined by a specified label field of your dataset.

To switch to clips view, simply click the patches icon above the sample grid in the App, toggle to the Labels submenu, and then choose the field whose clips you want to view. After you make a selection, a new ToClips view stage will be appended to the view bar and your view will be updated to show the clips.

Creating a clips view for a TemporalDetection or TemporalDetections field will create one sample per temporal detection defined by its [first, last] frame support:

Creating a clips view for a frame-level label list field such as Detections will contain one sample per contiguous range of frames that contains at least one label in the specified field:

Note

Switching to clips view will create clips for only the contents of your current view, so you can use the view bar and the filters sidebar to select only the content of interest prior to extracting clips.

See this section for more information about defining clip views.

When you hover over a clip in the grid view, the clip and its labels will play on loop. Similarly, when you open a clip in the video visualizer, you will see only the clip when you play the video. If you would like to see other segments of the video from which a clip was extracted, simply drag the video scrubber outside the range of the clip.

You can interact with clip views in the App just like you would with any other view, including:

• You can filter and transform clip views using the filter sidebar or the view bar

• Any modifications to label tags that you make via the tagging menu will be reflected on the source dataset

One notable exception is that tagging or untagging clips themselves (as opposed to their labels) will not affect the sample tags of the underlying Sample.

Note

Did you know? You can construct clip views programmatically via dataset views!

Sorting by similarity

Whenever you select samples, patches, or labels in the App in a Dataset that has been indexed by similarity, you can use the similarity menu in the App to sort or filter your current view based on similarity to the chosen image or object.

Note

Refer to the Brain guide for more information about indexing datasets by image/object similarity for use with this feature.

Image similarity

Whenever one or more images are selected in the App, the similarity menu icon appears above the grid. If you have indexed the dataset by image similarity, then you will be able to sort by similarity to your current selection.

You can use the advanced settings menu to choose between multiple brain keys and optionally specify a maximum number of matches to return (k) and whether to query by greatest or least similarity (if supported).

Note

For large datasets, you may notice longer load times the first time you use a similarity index in a session. Subsequent similarity searches will use cached results and will be faster!

Object similarity

Whenever one or more labels or patches are selected in the App, the similarity menu icon appears above the sample grid. If you have indexed the dataset by object similarity, then you will be able to sort by similarity to your current selection.

The typical workflow for object similarity is to first switch to object patches view for the label field of interest. In this view, the similarity menu icon will appear whenever you have selected one or more patches from the grid, and the resulting view will sort the patches according to the similarity of their objects with respect to the objects in the query patches.

You can use the advanced settings menu to choose between multiple brain keys and optionally specify a maximum number of matches to return (k) and whether to query by greatest or least similarity (if supported).

You can also sort by similarity to an object from the expanded sample view in the App by selecting an object and then using the similarity menu that appears in the upper-right corner of the modal:

Note

For large datasets, you may notice longer load times the first time you use a similarity index in a session. Subsequent similarity searches will use cached results and will be faster!

Text similarity

If you have indexed your dataset with a model that supports text queries, you can use the text similarity menu in the App to search for images (or object patches) of interest via arbitrary text queries!

You can use the advanced settings menu to choose between multiple brain keys and optionally specify a maximum number of matches to return (k) and whether to query by greatest or least similarity (if supported).

Note

Did you know? You can also perform text queries via the SDK by passing a prompt directly to sort_by_similarity()!

Multiple media fields

There are use cases where you may want to associate multiple media versions with each sample in your dataset, such as:

• Thumbnail images

• Anonymized (e.g., blurred) versions of the images

You can work with multiple media sources in FiftyOne by simply adding extra field(s) to your dataset containing the paths to each media source and then configuring your dataset to expose these multiple media fields in the App.

For example, let’s create thumbnail images for use in the App’s grid view and store their paths in a thumbnail_path field:

import fiftyone as fo
import fiftyone.utils.image as foui
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

# Generate some thumbnail images
foui.transform_images(
    dataset,
    size=(-1, 32),
    output_field="thumbnail_path",
    output_dir="/tmp/thumbnails",
)

print(dataset)

Name:        quickstart
Media type:  image
Num samples: 200
Persistent:  False
Tags:        []
Sample fields:
    id:               fiftyone.core.fields.ObjectIdField
    filepath:         fiftyone.core.fields.StringField
    tags:             fiftyone.core.fields.ListField(fiftyone.core.fields.StringField)
    metadata:         fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.metadata.ImageMetadata)
    created_at:       fiftyone.core.fields.DateTimeField
    last_modified_at: fiftyone.core.fields.DateTimeField
    ground_truth:     fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.labels.Detections)
    uniqueness:       fiftyone.core.fields.FloatField
    predictions:      fiftyone.core.fields.EmbeddedDocumentField(fiftyone.core.labels.Detections)
    thumbnail_path:   fiftyone.core.fields.StringField

We can expose the thumbnail images to the App by modifying the dataset’s App config:

# Modify the dataset's App config
dataset.app_config.media_fields = ["filepath", "thumbnail_path"]
dataset.app_config.grid_media_field = "thumbnail_path"
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

Adding thumbnail_path to the media_fields property adds it to the Media Field selector under the App’s settings menu, and setting the grid_media_field property to thumbnail_path instructs the App to use the thumbnail images by default in the grid view:

Warning

When populating multiple media fields on samples, keep in mind that all media sources must have the same type (e.g., image) and aspect ratio as the sample’s primary filepath, since the media must be compatible with the dataset’s spatial labels (e.g., object detections).

Configuring the App

The App’s behavior can be configured on a per-session, per-dataset, or global basis.

The order of precedence is:

1. Any changes that you make to the session.config of a live session

2. Any settings stored in a dataset’s app_config

3. Settings from your global App config

Any settings or changes made at higher levels of precedence will override any lower priority settings the next time you load/refresh the App.

Global App config

FiftyOne provides a global App config that you can use to customize the default App behavior for all sessions and datasets on your machine.

You can also customize the global App config on a per-session basis:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

# Your default App config
print(fo.app_config)

# Create a custom App config
app_config = fo.app_config.copy()
app_config.show_confidence = False
app_config.show_label = True
print(app_config)

# Launch App with custom config
session = fo.launch_app(dataset, config=app_config)
print(session.config)

Modifying your session

You can configure a live Session by editing its session.config property and calling session.refresh() to apply the changes:

print(session.config)

# Customize the config of a live session
session.config.show_confidence = True
session.config.show_label = True
session.refresh()  # must refresh after edits

Dataset App config

Datasets also provide an app_config property that you can use to customize the behavior of the App for that particular dataset:

import fiftyone as fo
import fiftyone.utils.image as foui
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")

# View the dataset's current App config
print(dataset.app_config)

# Generate some thumbnail images
foui.transform_images(
    dataset,
    size=(-1, 32),
    output_field="thumbnail_path",
    output_dir="/tmp/thumbnails",
)

# Modify the dataset's App config
dataset.app_config.media_fields = ["filepath", "thumbnail_path"]
dataset.app_config.grid_media_field = "thumbnail_path"
dataset.save()  # must save after edits

session = fo.launch_app(dataset)

Note

Any settings stored in a dataset’s app_config will override the corresponding settings from your global App config.