fix dataset and benchmark test && fix eval and doc

[codecov[bot]]

Codecov Report

Merging #42 (ce5d0ce) into main (1c26800) will increase coverage by 4.74%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   87.60%   92.35%   +4.74%     
==========================================
  Files          17       17              
  Lines        6359     6280      -79     
==========================================
+ Hits         5571     5800     +229     
+ Misses        788      480     -308     

Impacted Files	Coverage Δ
pygmtools/benchmark.py	97.28% <100.00%> (+1.64%)	:arrow_up:
pygmtools/dataset.py	90.83% <100.00%> (+15.73%)	:arrow_up:
pygmtools/dataset_config.py	100.00% <100.00%> (ø)
pygmtools/tensorflow_backend.py	94.53% <0.00%> (-0.02%)	:arrow_down:
pygmtools/numpy_backend.py	94.63% <0.00%> (+1.33%)	:arrow_up:
pygmtools/linear_solvers.py	78.94% <0.00%> (+1.48%)	:arrow_up:
pygmtools/jittor_backend.py	93.77% <0.00%> (+1.76%)	:arrow_up:
pygmtools/pytorch_backend.py	94.36% <0.00%> (+1.79%)	:arrow_up:
pygmtools/paddle_backend.py	93.85% <0.00%> (+2.19%)	:arrow_up:
... and 8 more

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