semi_grad option in VarAggregation and StdAggregation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6042 (e909b52) into master (00280e3) will increase coverage by 0.01%.
The diff coverage is 94.44%.

❗ Current head e909b52 differs from pull request most recent head 3309f7d. Consider uploading reports for the commit 3309f7d to get more accurate results

@@            Coverage Diff             @@
##           master    #6042      +/-   ##
==========================================
+ Coverage   84.88%   84.89%   +0.01%     
==========================================
  Files         361      361              
  Lines       20155    20165      +10     
==========================================
+ Hits        17108    17119      +11     
+ Misses       3047     3046       -1     

Impacted Files	Coverage Δ
torch_geometric/nn/aggr/basic.py	98.93% <90.00%> (+1.15%)	⬆️
torch_geometric/nn/aggr/fused.py	96.61% <100.00%> (+0.11%)	⬆️

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