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# Prepare datasets
If you have a dataset directory, you could use os environment variable named `YOLOX_DATADIR`. Under this directory, YOLOX will look for datasets in the structure described below, if needed.
```
$YOLOX_DATADIR/
COCO/
```
You can set the location for builtin datasets by
```shell
export YOLOX_DATADIR=/path/to/your/datasets
```
If `YOLOX_DATADIR` is not set, the default value of dataset directory is `./datasets` relative to your current working directory.
## Expected dataset structure for [COCO detection](https://cocodataset.org/#download):
```
COCO/
annotations/
instances_{train,val}2017.json
{train,val}2017/
# image files that are mentioned in the corresponding json
```
You can use the 2014 version of the dataset as well.
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