新增多任务模型 Dev zsx mtl1

[zanshuxun]

1. Add multi-task models: SharedBottom, ESMM, MMOE, PLE
2. Bugfix: https://github.com/shenweichen/DeepCTR-Torch/issues/240 https://github.com/shenweichen/DeepCTR-Torch/issues/232

[codecov[bot]]

Codecov Report

Merging #255 (90cae06) into master (2cd84f3) will increase coverage by 0.26%. The diff coverage is 93.23%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
+ Coverage   92.31%   92.58%   +0.26%     
==========================================
  Files          30       35       +5     
  Lines        2069     2333     +264     
==========================================
+ Hits         1910     2160     +250     
- Misses        159      173      +14     

Flag	Coverage Δ
pytest	92.58% <93.23%> (+0.26%)	:arrow_up:

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

Impacted Files	Coverage Δ
deepctr_torch/models/basemodel.py	86.45% <87.50%> (+1.35%)	:arrow_up:
deepctr_torch/models/multitask/esmm.py	90.24% <90.24%> (ø)
deepctr_torch/models/multitask/sharedbottom.py	91.30% <91.30%> (ø)
deepctr_torch/models/multitask/mmoe.py	92.53% <92.53%> (ø)
deepctr_torch/models/multitask/ple.py	95.87% <95.87%> (ø)
deepctr_torch/models/__init__.py	100.00% <100.00%> (ø)
deepctr_torch/models/dcnmix.py	88.37% <100.00%> (ø)
deepctr_torch/models/dien.py	97.23% <100.00%> (ø)
deepctr_torch/models/multitask/__init__.py	100.00% <100.00%> (ø)

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