
Traceback (most recent call last):


 "/usr/local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 793, in extract_info

ie_result = ie.extract(url)


 "/usr/local/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 508, in extract

ie_result = self._real_extract(url)


 "/usr/local/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1874, in _real_extract

encrypted_sig, video_id, player_url, age_gate)


 "/usr/local/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1241, in _decrypt_signature

'Signature extraction failed: ' + tb, cause=e)

youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):

Traceback (most recent call last):


 "eval_voc.py", line 2, in <module>

from model.build_model import Build_Model


 "/home/minggatsby/GitHub/YOLOv4-pytorch/model/build_model.py", line 8, in <module>

from model.YOLOv4 import YOLOv4


 "/home/minggatsby/GitHub/YOLOv4-pytorch/model/YOLOv4.py", line 8, in <module>

from .layers.global_context_block import ContextBlock2d


 "/home/minggatsby/GitHub/YOLOv4-pytorch/model/layers/global_context_block.py", line 3, in <module>

from mmcv.cnn import constant_init, kaiming_init
ModuleNotFoundError: No module named 'mmcv'