Use sampled_sub for faster utils.softmax

[rusty1s]

Also refactors WITH_PYG_LIB within TorchScript modules.

[codecov]

Codecov Report

Merging #6155 (074d0fe) into master (ced3034) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6155      +/-   ##
==========================================
- Coverage   84.35%   84.35%   -0.01%     
==========================================
  Files         365      365              
  Lines       20502    20500       -2     
==========================================
- Hits        17295    17293       -2     
  Misses       3207     3207              

Impacted Files	Coverage Δ
torch_geometric/nn/conv/rgcn_conv.py	95.30% <100.00%> (-0.10%)	⬇️
torch_geometric/nn/dense/linear.py	87.21% <100.00%> (-0.19%)	⬇️
torch_geometric/nn/norm/layer_norm.py	100.00% <100.00%> (ø)
torch_geometric/sampler/neighbor_sampler.py	66.79% <100.00%> (-0.26%)	⬇️
torch_geometric/utils/softmax.py	100.00% <100.00%> (ø)

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[ZeynepP]

Final qualifiers are available since Python 3.8. This makes the package not compatible anymore with python 3.7.

[rusty1s]

Thanks for letting me know. Will fix soon.

[rusty1s]

Fixed this via #6160. Sorry for the inconvenience!