Add license informaton about vendored packages

[hmaarrfk]

In #7 (comment) @seemethere had offered to help with some packaging work for conda-forge.

@isuruf suggested that we work on #7 (comment)

@seemethere, thanks for the offer. One task you could help with is a way to collect the licenses/copyright notices of the third party dependencies to comply with their license terms.

I'm creating this issue so we can close the original GPU issue.

[rgommers]

Typically there's a LICENSE or LICENSE.TXT or COPYING file in each subdirectory under third_party. It would be useful to specify what's actually needed here (format of metadata) - maybe link to a good example for another package?

[jaimergp]

This is what we did for OpenMM.

[isuruf]

What we need is a way to get a single license file that concatenates all of the license files.

[rgommers]

What we need is a way to get a single license file that concatenates all of the license files.

That should normally be present in an sdist or wheel too - I'd consider it a bug if that's missing. Wheels don't contain the correct info, and sdists aren't present at all on PyPI (different issue and probably on purpose, but also questionable - I'll file some issues).

[isuruf]

That should normally be present in an sdist or wheel too

It's not available and not available in the conda packages that pytorch distributes either. The only copyright notices found are those of pytorch sources and caffe2 sources and completely ignore the copyright notices of dozens of third party modules used.

[rgommers]

This is now available: https://github.com/pytorch/pytorch/blob/master/third_party/LICENSES_BUNDLED.txt. That file is included in the pytorch 1.8.0 wheels as well.