Tutorial on `nn.aggr` package

[rusty1s]

[codecov[bot]]

Codecov Report

Merging #5191 (82879b6) into master (7469ede) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 82879b6 differs from pull request most recent head df8ecfd. Consider uploading reports for the commit df8ecfd to get more accurate results

@@           Coverage Diff           @@
##           master    #5191   +/-   ##
=======================================
  Coverage   83.05%   83.05%           
=======================================
  Files         335      335           
  Lines       18485    18485           
=======================================
  Hits        15353    15353           
  Misses       3132     3132           

Impacted Files	Coverage Δ
torch_geometric/nn/conv/sage_conv.py	96.77% <ø> (ø)

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