Failing To 'pip3 Install Apex' Down To Failure To Build Cryptacular (installed)

Problem: pip3 install apex fails because of failure to build cryptacular, errors as below. cryptacular was successfully installed (before attempts of installing apex) using this on

Solution 1:

Uninstall the previous versions of apex. Then do these steps:

git clone https://www.github.com/nvidia/apex
cd apex
python setup.py install

worked like charm for me