Feature level classifier in Gabbar

[bkowshik]

Works on: https://github.com/mapbox/gabbar/issues/43

[bkowshik]

• Feature classifier - Gabbar - Jupyter notebook

Things are looking really interesting, @anandthakker please 👀 the notebook and give me some feedback:

• How is the ML workflow looking like
• What can we read from the current model performance
• Ideas to improve model performance

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cc: @batpad

[bkowshik]

Did a git rebase master to merge this branch to master.