update example code for libtorch 1.2 API

[deepali-c]

This is proposed to fix - #910

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[deepali-c]

@jlin27, I am trying to update the example for libtorch 1.2 API, please advise what can be done next as my PR validation has failed.

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[holly1238]

Hi @deepali-c! Can you sign the CLA agreement so that I can merge the pull request? Thanks!

[holly1238]

Fix pushed in #1767