fiftyone.utils.csv

CSV utilities.

Copyright 2017-2025, Voxel51, Inc.

voxel51.com

Classes:

CSVDatasetImporter([dataset_dir, data_path, …])	A flexible CSV importer that represents slice(s) of field values of a dataset as columns of a CSV file.
CSVDatasetExporter([export_dir, data_path, …])	A flexible CSV exporter that represents slice(s) of field values of a dataset as columns of a CSV file.

class fiftyone.utils.csv.CSVDatasetImporter(dataset_dir=None, data_path=None, labels_path=None, media_field='filepath', fields=None, skip_missing_media=False, include_all_data=False, shuffle=False, seed=None, max_samples=None)

Bases: fiftyone.utils.data.importers.GenericSampleDatasetImporter, fiftyone.utils.data.importers.ImportPathsMixin

A flexible CSV importer that represents slice(s) of field values of a dataset as columns of a CSV file.

See this page for format details.

Parameters

• dataset_dir (None) – the dataset directory. If omitted, data_path and/or labels_path must be provided

• data_path (None) –

  an optional parameter that enables explicit control over the location of the media. Can be any of the following:

  • a folder name like "data" or "data/" specifying a subfolder of dataset_dir where the media files reside

  • an absolute directory path where the media files reside. In this case, the dataset_dir has no effect on the location of the data

  • a filename like "data.json" specifying the filename of the JSON data manifest file in dataset_dir

  • an absolute filepath specifying the location of the JSON data manifest. In this case, dataset_dir has no effect on the location of the data

  • a dict mapping filenames to absolute filepaths

  If None, this parameter will default to whichever of data/ or data.json exists in the dataset directory

• labels_path (None) –

  an optional parameter that enables explicit control over the location of the labels. Can be any of the following:

  • a filename like "labels.csv" specifying the location of the labels in dataset_dir

  • an absolute filepath to the labels. In this case, dataset_dir has no effect on the location of the labels

  If None, the parameter will default to labels.csv

• media_field ("filepath") –

  the name of the column containing the media path for each sample. The media paths in this column may be:

  • filenames or relative paths to media files in data_path

  • absolute media paths, in which case data_path has no effect

• fields (None) –

  an optional parameter that specifies the columns to read and parse from the CSV file. Can be any of the following:

  • an iterable of column names to parse as strings

  • a dict mapping column names to functions that parse the column values into the appropriate type. Any keys with None values in this case are directly loaded as strings

  If not provided, all columns are parsed as strings

• skip_missing_media (False) – whether to skip (True) or raise an error (False) when rows with no media_field are encountered

• include_all_data (False) – whether to generate samples for all media in the data directory (True) rather than only creating samples for media with CSV rows (False)

• shuffle (False) – whether to randomly shuffle the order in which the samples are imported

• seed (None) – a random seed to use when shuffling

• max_samples (None) – a maximum number of samples to import. By default, all samples are imported

Attributes:

has_sample_field_schema	Whether this importer produces a sample field schema.
has_dataset_info	Whether this importer produces a dataset info dictionary.

Methods:

setup()	Performs any necessary setup before importing the first sample in the dataset.
close(*args)	Performs any necessary actions after the last sample has been imported.
get_dataset_info()	Returns the dataset info for the dataset.
get_sample_field_schema()	Returns a dictionary describing the field schema of the samples loaded by this importer.

property has_sample_field_schema

Whether this importer produces a sample field schema.

property has_dataset_info

Whether this importer produces a dataset info dictionary.

setup()

Performs any necessary setup before importing the first sample in the dataset.

This method is called when the importer’s context manager interface is entered, DatasetImporter.__enter__().

close(*args)

Performs any necessary actions after the last sample has been imported.

This method is called when the importer’s context manager interface is exited, DatasetImporter.__exit__().

Parameters

*args – the arguments to DatasetImporter.__exit__()

get_dataset_info()

Returns the dataset info for the dataset.

By convention, this method should be called after all samples in the dataset have been imported.

Returns

a dict of dataset info

get_sample_field_schema()

Returns a dictionary describing the field schema of the samples loaded by this importer.

Returns

a dict mapping field names to fiftyone.core.fields.Field instances or str(field) representations of them

class fiftyone.utils.csv.CSVDatasetExporter(export_dir=None, data_path=None, labels_path=None, export_media=None, rel_dir=None, abs_paths=False, media_field='filepath', fields=None)

Bases: fiftyone.utils.data.exporters.BatchDatasetExporter, fiftyone.utils.data.exporters.ExportPathsMixin

A flexible CSV exporter that represents slice(s) of field values of a dataset as columns of a CSV file.

See this page for exporting datasets of this type.

Parameters

• export_dir (None) – the directory to write the export. This has no effect if data_path and labels_path are absolute paths

• data_path (None) –

  an optional parameter that enables explicit control over the location of the exported media. Can be any of the following:

  • a folder name like "data" or "data/" specifying a subfolder of export_dir in which to export the media

  • an absolute directory path in which to export the media. In this case, the export_dir has no effect on the location of the data

  • a JSON filename like "data.json" specifying the filename of the manifest file in export_dir generated when export_media is "manifest"

  • an absolute filepath specifying the location to write the JSON manifest file when export_media is "manifest". In this case, export_dir has no effect on the location of the data

  If None, the default value of this parameter will be chosen based on the value of the export_media parameter

• labels_path (None) –

  an optional parameter that enables explicit control over the location of the exported labels. Can be any of the following:

  • a filename like "labels.csv" specifying the location in export_dir in which to export the labels

  • an absolute filepath to which to export the labels. In this case, the export_dir has no effect on the location of the labels

  If None, the labels will be exported into export_dir using the default filename

• export_media (None) –

  controls how to export the raw media. The supported values are:

  • True: copy all media files into the output directory

  • False: don’t export media

  • "move": move all media files into the output directory

  • "symlink": create symlinks to the media files in the output directory

  • "manifest": create a data.json in the output directory that maps UUIDs used in the labels files to the filepaths of the source media, rather than exporting the actual media

  If None, the default value of this parameter will be chosen based on the value of the data_path parameter

• rel_dir (None) – an optional relative directory to strip from each input filepath to generate a unique identifier for each media. When exporting media, this identifier is joined with data_path to generate an output path for each exported media. This argument allows for populating nested subdirectories that match the shape of the input paths. The path is converted to an absolute path (if necessary) via fiftyone.core.storage.normalize_path()

• abs_paths (False) – whether to store absolute paths to the media in the exported labels

• media_field ("filepath") – the name of the field containing the media to export for each sample

• fields (None) –

  an optional argument specifying the fields or embedding.field.names to include as columns in the exported CSV. Can be:

  • a field or iterable of fields

  • a dict mapping field names to column names

  By default, only the media_field is exported

Methods:

setup()	Performs any necessary setup before exporting the first sample in the dataset.
export_samples(sample_collection[, progress])	Exports the given sample collection.
close(*args)	Performs any necessary actions after the last sample has been exported.
export_sample(*args, **kwargs)	Exports the given sample to the dataset.
log_collection(sample_collection)	Logs any relevant information about the fiftyone.core.collections.SampleCollection whose samples will be exported.

setup()

Performs any necessary setup before exporting the first sample in the dataset.

This method is called when the exporter’s context manager interface is entered, DatasetExporter.__enter__().

export_samples(sample_collection, progress=None)

Exports the given sample collection.

Parameters

• sample_collection – a fiftyone.core.collections.SampleCollection

• progress (None) – whether to render a progress bar (True/False), use the default value fiftyone.config.show_progress_bars (None), or a progress callback function to invoke instead

close(*args)

Performs any necessary actions after the last sample has been exported.

This method is called when the exporter’s context manager interface is exited, DatasetExporter.__exit__().

Parameters

*args – the arguments to DatasetExporter.__exit__()

export_sample(*args, **kwargs)

Exports the given sample to the dataset.

Parameters

• *args – subclass-specific positional arguments

• **kwargs – subclass-specific keyword arguments

log_collection(sample_collection)

Logs any relevant information about the fiftyone.core.collections.SampleCollection whose samples will be exported.

Subclasses can optionally implement this method if their export format can record information such as the fiftyone.core.collections.SampleCollection.info() of the collection being exported.

By convention, this method must be optional; i.e., if it is not called before the first call to export_sample(), then the exporter must make do without any information about the fiftyone.core.collections.SampleCollection (which may not be available, for example, if the samples being exported are not stored in a collection).

Parameters

sample_collection – the fiftyone.core.collections.SampleCollection whose samples will be exported