No such file or directory error on instances_train2017.json file

[unrue]

I'm using detectron2 (first times) train_net.py script:

python3.8 ./train_net.py --num-gpus 4 --config-file ../configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_1x.yaml
Having the following error:

Traceback (most recent call last):
  File "./train_net.py", line 157, in <module>
    launch(
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/engine/launch.py", line 67, in launch
    mp.spawn(
  File "/prod/opt/libraries/ai/2.1.0/none/ai-conda-env-py3.8-cuda-openmpi-11.0/lib/python3.8/site-packages/torch/multiprocessing/spawn.py", line 230, in spawn
    return start_processes(fn, args, nprocs, join, daemon, start_method='spawn')
  File "/prod/opt/libraries/ai/2.1.0/none/ai-conda-env-py3.8-cuda-openmpi-11.0/lib/python3.8/site-packages/torch/multiprocessing/spawn.py", line 188, in start_processes
    while not context.join():
  File "/prod/opt/libraries/ai/2.1.0/none/ai-conda-env-py3.8-cuda-openmpi-11.0/lib/python3.8/site-packages/torch/multiprocessing/spawn.py", line 150, in join
    raise ProcessRaisedException(msg, error_index, failed_process.pid)
torch.multiprocessing.spawn.ProcessRaisedException: 

-- Process 2 terminated with the following error:
Traceback (most recent call last):
  File "/prod/opt/libraries/ai/2.1.0/none/ai-conda-env-py3.8-cuda-openmpi-11.0/lib/python3.8/site-packages/torch/multiprocessing/spawn.py", line 59, in _wrap
    fn(i, *args)
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/engine/launch.py", line 126, in _distributed_worker
    main_func(*args)
  File "/m100_scratch/userinternal/gfatigat/DL/detectron2/detectron2/tools/train_net.py", line 145, in main
    trainer = Trainer(cfg)
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/engine/defaults.py", line 378, in __init__
    data_loader = self.build_train_loader(cfg)
  File "/home/user1//local/lib/python3.8/site-packages/detectron2/engine/defaults.py", line 547, in build_train_loader
    return build_detection_train_loader(cfg)
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/config/config.py", line 207, in wrapped
    explicit_args = _get_args_from_config(from_config, *args, **kwargs)
  File "/home/user1//local/lib/python3.8/site-packages/detectron2/config/config.py", line 245, in _get_args_from_config
    ret = from_config_func(*args, **kwargs)
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/data/build.py", line 344, in _train_loader_from_config
    dataset = get_detection_dataset_dicts(
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/data/build.py", line 241, in get_detection_dataset_dicts
    dataset_dicts = [DatasetCatalog.get(dataset_name) for dataset_name in names]
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/data/build.py", line 241, in <listcomp>
    dataset_dicts = [DatasetCatalog.get(dataset_name) for dataset_name in names]
  File "/home/user1//.local/lib/python3.8/site-packages/detectron2/data/catalog.py", line 58, in get
    return f()
  File "/home/user1//local/lib/python3.8/site-packages/detectron2/data/datasets/coco.py", line 500, in <lambda>
    DatasetCatalog.register(name, lambda: load_coco_json(json_file, image_root, name))
  File "/home/user1/.local/lib/python3.8/site-packages/detectron2/data/datasets/coco.py", line 69, in load_coco_json
    coco_api = COCO(json_file)
  File "/home/user1/.local/lib/python3.8/site-packages/pycocotools/coco.py", line 81, in __init__
    with open(annotation_file, 'r') as f:
FileNotFoundError: [Errno 2] No such file or directory: 'datasets/coco/annotations/instances_train2017.json'

Reading the manual and using the script "prepare_for_tests.sh", are generated: val2017 and annotation directories with instances_val2017_100.json file. No train files are generated and the json file have "100" in the name, that is unexpected. Maybe some updated of the script is necessary? Could you help me to solve such problem? Thanks.

[fadaishaitaiyang]

Who can help us solve this problem?

[unrue]

I solved downloading the entire coco dataset, But I think detectron script in datasets/prepare_for_tests.sh should be fixed.