You may see a trusted or SSL certificate error message when trying to install dependencies.  This because some of the hosts are not trusted by the pip tool.

Try with the next command: 

pip install --trusted-host download.pytorch.org -r requirements.txt

If this doesn't work either In that case you can tell pip to trust those hosts by adding them to a text file called "pip.ini" which you place in the "venv" folder.  Create the file if it doesn't exist and add the following contents:

And then, try running the following command:

pip config set global.trusted-host "pypi.org files.pythonhosted.org download.pytorch.org"[global]
trusted-host = pypi.python.org
   pypi.org
   files.pythonhosted.org