Adding support for TensorFlow 2.x#372

Merged

ifielker merged 12 commits intomlkit-10from

Dec 10, 2019

Commits on Dec 2, 2019

Commits on Dec 5, 2019

fix lint
ifielker
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Commits on Dec 9, 2019

added comments and fix
ifielker
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Commits on Dec 10, 2019

applied review suggestion
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