* [Doc] Add the tutorial for using custom dataset
* [Doc] Add coco example
* [Doc] Fix bug in command
* [Doc] Fix bug in command
* Update docs/en/user_guides/4_pretrain_custom_dataset.md
Co-authored-by: Yuan Liu <30762564+YuanLiuuuuuu@users.noreply.github.com>
* [Doc] Update the doc according to the reviews
Co-authored-by: Yuan Liu <30762564+YuanLiuuuuuu@users.noreply.github.com>