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Can't run demo, model filename is too long

See original GitHub issue

🐛 Bug

When I run webcam.py the script tries to download weights for the model, but the filaname for cached files is too long. Max filename is usually 255 characters.

To Reproduce

Steps to reproduce the behavior:

Install repo
Run python webcam.py

Error:

Downloading: "https://dl.fbaipublicfiles.com/detectron/35858933/12_2017_baselines/e2e_mask_rcnn_R-50-FPN_1x.yaml.01_48_14.DzEQe4wC/output/train/coco_2014_train%3Acoco_2014_valminusminival/generalized_rcnn/model_final.pkl" to /home/rizhiy/.torch/models/_detectron_35858933_12_2017_baselines_e2e_mask_rcnn_R-50-FPN_1x.yaml.01_48_14.DzEQe4wC_output_train_coco_2014_train%3Acoco_2014_valminusminival_generalized_rcnn_model_final.pkl
100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 362433370/362433370 [00:32<00:00, 11090137.90it/s]
Traceback (most recent call last):
  File "/home/rizhiy/anaconda3/envs/liveness/lib/python3.6/shutil.py", line 544, in move
    os.rename(src, real_dst)
OSError: [Errno 18] Invalid cross-device link: '/tmp/tmp5d8g6paz' -> '/home/rizhiy/.torch/models/_detectron_35858933_12_2017_baselines_e2e_mask_rcnn_R-50-FPN_1x.yaml.01_48_14.DzEQe4wC_output_train_coco_2014_train%3Acoco_2014_valminusminival_generalized_rcnn_model_final.pkl'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "webcam.py", line 80, in <module>
    main()
  File "webcam.py", line 64, in main
    min_image_size=args.min_image_size,
  File "/home/rizhiy/liveness/maskrcnn-benchmark/demo/predictor.py", line 117, in __init__
    _ = checkpointer.load(cfg.MODEL.WEIGHT)
  File "/home/rizhiy/liveness/maskrcnn-benchmark/maskrcnn_benchmark/utils/checkpoint.py", line 61, in load
    checkpoint = self._load_file(f)
  File "/home/rizhiy/liveness/maskrcnn-benchmark/maskrcnn_benchmark/utils/checkpoint.py", line 129, in _load_file
    cached_f = cache_url(f)
  File "/home/rizhiy/liveness/maskrcnn-benchmark/maskrcnn_benchmark/utils/model_zoo.py", line 54, in cache_url
    _download_url_to_file(url, cached_file, hash_prefix, progress=progress)
  File "/home/rizhiy/anaconda3/envs/liveness/lib/python3.6/site-packages/torch/utils/model_zoo.py", line 103, in _download_url_to_file
    shutil.move(f.name, dst)
  File "/home/rizhiy/anaconda3/envs/liveness/lib/python3.6/shutil.py", line 558, in move
    copy_function(src, real_dst)
  File "/home/rizhiy/anaconda3/envs/liveness/lib/python3.6/shutil.py", line 257, in copy2
    copyfile(src, dst, follow_symlinks=follow_symlinks)
  File "/home/rizhiy/anaconda3/envs/liveness/lib/python3.6/shutil.py", line 121, in copyfile
    with open(dst, 'wb') as fdst:
OSError: [Errno 36] File name too long: '/home/rizhiy/.torch/models/_detectron_35858933_12_2017_baselines_e2e_mask_rcnn_R-50-FPN_1x.yaml.01_48_14.DzEQe4wC_output_train_coco_2014_train%3Acoco_2014_valminusminival_generalized_rcnn_model_final.pkl'