Add support for what-if (witwidget)

Description

what-if (witwidget) adds support for analyzing and understanding trained ML models. It is by google:
https://pair-code.github.io/what-if-tool/

This PR adds the pip library witwidget to the base environment and a jupyter notebook extension to allow it to be used in notebooks (only in Google Chrome).

Assignee

Jim Dowling

Reporter

Jim Dowling

Labels

None

Fix versions

Priority

Medium
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