[API] Add neg_sampling parameter

[massquantity]

No description provided.

[codecov]

Codecov Report

Merging #254 (b50a9ad) into master (d8a1f9a) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #254      +/-   ##
==========================================
+ Coverage   99.19%   99.43%   +0.23%     
==========================================
  Files         108      108              
  Lines        6835     6715     -120     
==========================================
- Hits         6780     6677     -103     
+ Misses         55       38      -17     

Flag	Coverage Δ
CI	99.43% <100.00%> (+0.23%)	⬆️

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Impacted Files	Coverage Δ
libreco/algorithms/svdpp.py	100.00% <ø> (ø)
libreco/algorithms/user_cf.py	100.00% <ø> (+7.14%)	⬆️
libreco/bases/base.py	100.00% <ø> (ø)
libreco/bases/sage_base.py	100.00% <ø> (ø)
libreco/training/tf_trainer.py	100.00% <ø> (ø)
libreco/training/torch_trainer.py	100.00% <ø> (ø)
libreco/algorithms/als.py	100.00% <100.00%> (ø)
libreco/algorithms/autoint.py	100.00% <100.00%> (ø)
libreco/algorithms/bpr.py	100.00% <100.00%> (ø)
libreco/algorithms/deepfm.py	100.00% <100.00%> (ø)
... and 22 more

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