Simplify label_semantic_roles book example using new LoDTensor API #10886
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Please check #10735 for why we are doing this.
To solve the issue above, we have merged a PR #10817 and now there is utility functions here to create LoDTensor.
So this means that we can simplify the book example code using the new API.
This PR tries to simplify the old label_semantic_roles book example.