Changes to reflect TF 2 compatible

[tnsharath]

Issue: Could not run the code due to Tensorflow version mismatch in colab.
Solution: Made compatible by using tf.compat.v1.

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[review-notebook-app]

Check out this pull request on 

Review Jupyter notebook visual diffs & provide feedback on notebooks.

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[tnsharath]

@googlebot I signed it!

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[aniketmaurya]

does the library support tf 2.x?