无法安装依赖：ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/

[BirchFst]

>>> pip install -r requirements.txt -i https://pypi.jittor.org/simple -I --break-system-packages
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.jittor.org/simple
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(104, '连接被对方重设'))': /simple/jittor/
ERROR: Could not find a version that satisfies the requirement jittor==1.3.8.5 (from versions: none)
ERROR: No matching distribution found for jittor==1.3.8.5

这个是网络问题吗，无法安装这个源的依赖