Fix fidelity metric and assigning edge masks as tensors

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6510 (51bb206) into master (a7a5fd2) will decrease coverage by 1.75%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #6510      +/-   ##
==========================================
- Coverage   87.42%   85.68%   -1.75%     
==========================================
  Files         406      406              
  Lines       22694    22659      -35     
==========================================
- Hits        19840    19415     -425     
- Misses       2854     3244     +390     

Impacted Files	Coverage Δ
torch_geometric/explain/metric/fidelity.py	100.00% <ø> (ø)
torch_geometric/explain/algorithm/utils.py	96.77% <75.00%> (-3.23%)	⬇️
torch_geometric/nn/models/dimenet_utils.py	0.00% <0.00%> (-75.52%)	⬇️
torch_geometric/nn/models/dimenet.py	17.84% <0.00%> (-49.66%)	⬇️
torch_geometric/visualization/graph.py	68.25% <0.00%> (-26.99%)	⬇️
torch_geometric/profile/profile.py	33.33% <0.00%> (-25.39%)	⬇️
torch_geometric/nn/conv/utils/typing.py	83.75% <0.00%> (-15.00%)	⬇️
torch_geometric/nn/pool/asap.py	92.00% <0.00%> (-8.00%)	⬇️
torch_geometric/nn/inits.py	67.85% <0.00%> (-7.15%)	⬇️
torch_geometric/resolver.py	82.75% <0.00%> (-6.90%)	⬇️
... and 33 more

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