feat: implement DeepFM

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Patch coverage: 69.93% and project coverage change: +0.02% 🎉

Comparison is base (634d24d) 70.23% compared to head (8deb4e8) 70.26%.

❗ Current head 8deb4e8 differs from pull request most recent head fbe83c9. Consider uploading reports for the commit fbe83c9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #728      +/-   ##
==========================================
+ Coverage   70.23%   70.26%   +0.02%     
==========================================
  Files          65       65              
  Lines       12279    12502     +223     
==========================================
+ Hits         8624     8784     +160     
- Misses       2870     2911      +41     
- Partials      785      807      +22     

Files Changed	Coverage Δ
config/config.go	72.90% <ø> (ø)
master/master.go	1.14% <0.00%> (-0.02%)	⬇️
model/click/unified_index.go	91.00% <0.00%> (-1.86%)	⬇️
server/rest.go	76.24% <0.00%> (-0.66%)	⬇️
worker/worker.go	66.08% <31.57%> (-0.98%)	⬇️
model/click/model.go	76.98% <53.84%> (-1.50%)	⬇️
base/encoding/encoding.go	73.80% <60.00%> (+1.30%)	⬆️
model/click/deepfm.go	83.41% <79.91%> (+2.04%)	⬆️
model/click/evaluator.go	86.51% <100.00%> (ø)
model/params.go	94.31% <100.00%> (+0.72%)	⬆️

... and 1 file with indirect coverage changes

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