Commit 1038927c authored by Saurabh Saxena's avatar Saurabh Saxena Committed by TensorFlower Gardener
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Add SerializeIterator op that serializes an IteratorResource into a variant tensor. 

Add DeserializeIterator op that builds IteratorResource from a variant tensor.
Move BundleReaderWrapper and BundleWriterWrapper from dataset.h to iterator_ops.cc.
Add generic key-value store interfaces IteratorStateReader and IteratorStateWriter for reading/writing state of iterators.
Get rid of IteratorBundleReader and IteratorBundleWriter.

PiperOrigin-RevId: 173140858
parent 57f3e529
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