while installing apex extension for pytorch(python environment) the following error is showing, am unable to solve this problem
I want to install apex extension for my pytorch environment, my system is windows 10 and am using python version 3.8.1 and pip version is 20.0.2

I read the instructions from this https://github.com/NVIDIA/apex and I executed the command 

pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext

This error is showing.


  c:\users\dell\appdata\local\programs\python\python38\lib\site-packages\pip_internal\commands\install.py:244: UserWarning: Disabling all use of wheels due to the use of --build-option / --global-option / --install-option.
        cmdoptions.check_install_build_global(options)
      Non-user install because site-packages writeable
      Created temporary directory: C:\Users\Dell\AppData\Local\Temp\pip-ephem-wheel-cache-ehoqwpvf
      Created temporary directory: C:\Users\Dell\AppData\Local\Temp\pip-req-tracker-uowlsjqi
      Initialized build tracking at C:\Users\Dell\AppData\Local\Temp\pip-req-tracker-uowlsjqi
      Created build tracker: C:\Users\Dell\AppData\Local\Temp\pip-req-tracker-uowlsjqi
      Entered build tracker: C:\Users\Dell\AppData\Local\Temp\pip-req-tracker-uowlsjqi
      Created temporary directory: C:\Users\Dell\AppData\Local\Temp\pip-install-rivnsaa9
      Cleaning up...
      Removed build tracker: 'C:\Users\Dell\AppData\Local\Temp\pip-req-tracker-uowlsjqi'
      ERROR: You must give at least one requirement to install (see "pip help install")
      Exception information:
      Traceback (most recent call last):
        File "c:\users\dell\appdata\local\programs\python\python38\lib\site-packages\pip_internal\cli\base_command.py", line 186, in _main
          status = self.run(options, args)


Please solve this problem


pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext



The line specified in your link is 

$ pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./


Note that you're missing the final ./, which is why pip tells you that


  You must give at least one requirement to install (see "pip help install")


you're telling it to install, but you're not telling it what to install.
