Add computation graph based logistic regression

[Benardi]

Add computation graph based logistic regression

Description

Remove supv module. Break lgx_rg into lgx_rg/sgl_parm and lgx_rg/cmpt_grf. Add tests and documentation.

Fixes #51

Type of change

Please mark options that are relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How Has This Been Tested?

• [x] Existing tox test environments have been run
• [x] New tests have been cross checked against validated implementation
• [x] Documentation has been manually checked

Checklist:

• [x] I did follow the contribution guidelines
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[codecov[bot]]

Codecov Report

Merging #52 into master will increase coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   99.76%   99.78%   +0.01%     
==========================================
  Files          11       12       +1     
  Lines         430      457      +27     
==========================================
+ Hits          429      456      +27     
  Misses          1        1

Impacted Files	Coverage Δ
touvlo/nn_clsf.py	98.91% <ø> (ø)
touvlo/lin_rg.py	100% <ø> (ø)
touvlo/lgx_rg/cmpt_grf.py	100% <100%> (ø)
touvlo/lgx_rg/__init__.py	100% <100%> (ø)
touvlo/lgx_rg/sgl_parm.py	100% <100%> (ø)

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