fix generate_is_isomorphic_graphs func (Tensorflow)

[codecov[bot]]

Codecov Report

Merging #39 (5fc9d3e) into main (1573b5d) will increase coverage by 0.02%. The diff coverage is 61.81%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   83.69%   83.71%   +0.02%     
==========================================
  Files          24       24              
  Lines        6918     6891      -27     
==========================================
- Hits         5790     5769      -21     
+ Misses       1128     1122       -6     

Impacted Files	Coverage Δ
pygmtools/tensorflow_backend.py	81.69% <17.64%> (+0.05%)	:arrow_up:
pygmtools/utils.py	71.86% <64.70%> (-0.82%)	:arrow_down:
pygmtools/pytorch_backend.py	89.41% <75.00%> (+0.01%)	:arrow_up:
pygmtools/jittor_backend.py	84.11% <100.00%> (+0.01%)	:arrow_up:
pygmtools/numpy_backend.py	89.37% <100.00%> (+0.01%)	:arrow_up:
pygmtools/paddle_backend.py	86.22% <100.00%> (+0.02%)	:arrow_up:
tests/test_multi_graph_solvers.py	95.31% <100.00%> (+6.35%)	:arrow_up:
tests/test_neural_solvers.py	92.85% <100.00%> (+0.22%)	:arrow_up:

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