Set minimum pytorch version to 1.8 + cleanup

[SkafteNicki]

What does this PR do?

Fixes #1262
Sets minimum pytorch version to 1.8 and clean-up all skipping/conditioning throughout the code that was necessary to run for older versions.

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[stancld]

#1259 has set v0.10 milestone (maybe for a possible patch release). We should make this in sync.

[codecov]

Codecov Report

Merging #1263 (df0523f) into master (6ae08a8) will decrease coverage by 0%.
The diff coverage is 96%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1263   +/-   ##
======================================
- Coverage      86%     86%   -0%     
======================================
  Files         195     195           
  Lines       11463   11388   -75     
======================================
- Hits         9836    9762   -74     
+ Misses       1627    1626    -1     

[SkafteNicki]

#1259 has set v0.10 milestone (maybe for a possible patch release). We should make this in sync.

You are right. But then we probably need to move #1259 to v0.11 because this kind of breaking change to minimum requirement i think we need to do as an v0.x.0 release and not v0.10.x.

[SkafteNicki]

seems like CI pulling the wrong version of torch for oldest config. Maybe the cache is needs to be reset?

[stancld]

@SkafteNicki @Borda There's a .github/assistant.py file containing the following dict:

LUT_PYTHON_TORCH = {
    "3.8": "1.4",
    "3.9": "1.7.1",
    "3.10": "1.11",
}

I guess this has to be updated

[Borda]

There's a .github/assistant.py file containing the following dict:

seems like a bug in the assistant as it shall take the max

[Borda]

@SkafteNicki seems there are a few tests failing for Windows and PT 1.8