# Cityscapes
Cityscapes is a large-scale dataset that contains a diverse set of
stereo video sequences recorded in street scenes from 50 different cities,
with high quality pixel-level annotations of 5,000 frames in addition to a
larger set of 20,000 weakly annotated frames.
The dataset is intended for:
- Assessing the performance of vision algorithms for major tasks of
semantic urban scene understanding: pixel-level, instance-level, and
panoptic semantic labeling
- Supporting research that aims to exploit large volumes of (weakly)
annotated data, e.g. for training deep neural networks
#### NOTE
In order to load the Cityscapes dataset, you must download the source data
manually. The directory should be organized in the following format:
```text
source_dir/
leftImg8bit_trainvaltest.zip
gtFine_trainvaltest.zip # optional
gtCoarse.zip # optional
gtBbox_cityPersons_trainval.zip # optional
```
You can register at [https://www.cityscapes-dataset.com/register](https://www.cityscapes-dataset.com/register) in order
to get links to download the data.
**Details**
- Dataset name: `cityscapes`
- Dataset source: [https://www.cityscapes-dataset.com](https://www.cityscapes-dataset.com)
- Dataset license: [https://www.cityscapes-dataset.com/license](https://www.cityscapes-dataset.com/license)
- Dataset size: 11.80 GB
- Tags: `image, multilabel, automotive, manual`
- Supported splits: `train, validation, test`
- ZooDataset class:
[`CityscapesDataset`](../../api/fiftyone.zoo.datasets.base.md#fiftyone.zoo.datasets.base.CityscapesDataset)
**Example usage**
Python
CLI
```python
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-cityscapes-files"
dataset = foz.load_zoo_dataset(
"cityscapes",
split="validation",
source_dir=source_dir,
)
session = fo.launch_app(dataset)
```
```shell
# The path to the source files that you manually downloaded
SOURCE_DIR="/path/to/dir-with-cityscapes-files"
fiftyone zoo datasets load cityscapes --split validation \
--kwargs "source_dir=${SOURCE_DIR}"
fiftyone app launch cityscapes-validation
```
