Rewrite multi-GPU documentation #1861
Merged
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Closes #1860. The changes to the document are quite in-depth and there is new added info, so this PR needs to be fact-checked aside of proofreading.
The resulting compiled document looks as intended.
Overview of the changes
Additional notes
The Colab tutorial (which was brought up in the issue here) is not linked in the document as of this PR. It should probably be updated to the contents of this PR, but as unless it actually gets any different content from the documentation, it probably doesn't need to be linked from the docs.
@anautsch (in DMs) mentioned DDP tests and some changes from #1817 that indirectly affect DDP. This PR mentions neither at the time, but perhaps someone more qualified than me could enhance the DDP-safety subsection further.