Issue installing APEX on ubuntu

Usage:

I'm trying to install and run https://github.com/microsoft/DialoGPT which uses Apex

environment:

Ubuntu 16.04
conda 4.8.2
Python 3.6.9 :: Anaconda, Inc.
processor: Intel® Core™ i7-9700F CPU @ 3.00GHz × 8
graphics: GeForce RTX 2060/PCIe/SSE2

Problem:

After running
pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./
this occurs:

ERROR: Command errored out with exit status 1: /home/bl/anaconda3/envs/LSP/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/home/bl/DialoGPT/apex/setup.py'"'"'; __file__='"'"'/home/bl/DialoGPT/apex/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' --cpp_ext --cuda_ext install --record /tmp/pip-record-j92zt9oj/install-record.txt --single-version-externally-managed --compile --install-headers /home/bl/anaconda3/envs/LSP/include/python3.6m/apex Check the logs for full command output.

( which is causes another exception Given no hashes to check 137 links for project 'pip': discarding no candidates )

Reproduce the reported pip install command in the stated Ubuntu, Python, and conda environment, then start by inspecting apex/setup.py and the complete build output beyond the abbreviated error. Done means the Apex package installs with the requested C++ and CUDA extensions and can be used by DialoGPT.