Fix: len(batch) == batch.num_graphs

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4931 (32db0d0) into master (5f77394) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4931      +/-   ##
==========================================
+ Coverage   82.68%   82.70%   +0.01%     
==========================================
  Files         330      330              
  Lines       17844    17850       +6     
==========================================
+ Hits        14755    14763       +8     
+ Misses       3089     3087       -2     

Impacted Files	Coverage Δ
torch_geometric/data/batch.py	96.29% <100.00%> (+2.62%)	⬆️
torch_geometric/data/collate.py	96.50% <100.00%> (+0.10%)	⬆️

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