Add a num_nodes parameter to the HypergraphConv layer

[piotrchmiel]

No description provided.

[codecov]

Codecov Report

Merging #7560 (f6c8a04) into master (e4297b1) will decrease coverage by 0.33%.
The diff coverage is 85.71%.

❗ Current head f6c8a04 differs from pull request most recent head af8020a. Consider uploading reports for the commit af8020a to get more accurate results

@@            Coverage Diff             @@
##           master    #7560      +/-   ##
==========================================
- Coverage   91.73%   91.40%   -0.33%     
==========================================
  Files         449      449              
  Lines       25027    25028       +1     
==========================================
- Hits        22958    22877      -81     
- Misses       2069     2151      +82     

Impacted Files	Coverage Δ
torch_geometric/nn/conv/hypergraph_conv.py	98.75% <85.71%> (-1.25%)	⬇️

... and 17 files with indirect coverage changes

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