graph: bring keras_util.py up to date with TF #2052
Merged
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Summary:
Fixes #2051. This cherry-picks part of Google-internal cl/239834276 to
fix a change made in TensorFlow 90f1ed7cd3ae167b60c1b0acc6f45af454c8d592
that first appeared in the 20190323 nightly.
Test Plan:
Running
bazel test //tensorboard/plugins/graph:keras_util_test
failsbefore this patch but passes after it, on tf-nightly-20190325-py2.7.
wchargin-branch: fix-2051