pip >= 20.3 required, not 19.0

[nanoflooder]

URL(s) with the issue:

https://github.com/NVIDIA/tensorflow#readme

Description of issue (what needs changing):

Readme says in requirements: "pip 19.0 or later"

Suggested fix

pip 20.3 or later

Explanation

• nvidia-tensorflow[horovod] depends on tensorrt
• tensorrt is distributed using Manylinux_2_17
• Manylinux_x_y requires pip >= 20.3 (source: https://github.com/pypa/manylinux#readme)

The reason why this is important is because Ubuntu 20.04 only has pip 20.0 in its repositories. When trying to install nvidia-tensorflow[horovod] with an outdated pip, it stumbles on tensorrt with the following error:

Could not find a version that satisfies the requirement tensorrt~=8.5

When trying to install tensorrt manually by downloading the .whl, it says:

tensorrt-8.5.3.1-cp38-none-manylinux_2_17_x86_64.whl is not a supported wheel on this platform

Being a linux/python newbie, I spent quite some time figuring out what went wrong, so perhaps this will save somebody's time in the future

[nluehr]

Thanks for calling this to our attention. The README has been updated.