fix bug in MMC

[yangarbiter]

No description provided.

[codecov-io]

Codecov Report

Merging #85 into master will increase coverage by 0.66%.
The diff coverage is 97.95%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   87.48%   88.15%   +0.66%     
==========================================
  Files          27       28       +1     
  Lines         895      920      +25     
==========================================
+ Hits          783      811      +28     
+ Misses        112      109       -3

Impacted Files	Coverage Δ
libact/models/sklearn_adapter.py	95.65% <ø> (+4.34%)	✅
libact/models/multilabel/dummy_clf.py	94.11% <100%> (-5.89%)	❌
..._strategies/multilabel/maximum_margin_reduction.py	97.77% <100%> (-0.3%)	❌
libact/query_strategies/multilabel/init.py	100% <100%> (ø)	✅
libact/models/multilabel/binary_relevance.py	76.81% <100%> (ø)	✅
...query_strategies/multilabel/binary_minimization.py	100% <100%> (ø)
libact/models/logistic_regression.py	94.73% <ø> (+15.78%)	✅

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