format according to pep8

[sepilqi]

• line length of 80
• add standard docs for better usage.

[codecov]

Codecov Report

Base: 95.31% // Head: 95.09% // Decreases project coverage by -0.21% ⚠️

Coverage data is based on head (5e89b80) compared to base (9564e05).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   95.31%   95.09%   -0.22%     
==========================================
  Files          60       41      -19     
  Lines        3158     2549     -609     
==========================================
- Hits         3010     2424     -586     
+ Misses        148      125      -23     

Flag	Coverage Δ
pytest	95.09% <ø> (-0.22%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
deepctr/models/nfm.py
deepctr/models/fibinet.py
deepctr/models/deepfm.py
deepctr/models/xdeepfm.py
deepctr/inputs.py
deepctr/models/ccpm.py
deepctr/feature_column.py
deepctr/models/autoint.py
deepctr/models/fnn.py
deepctr/models/__init__.py
... and 9 more

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