Commit bcc64f89 authored by A. Unique TensorFlower's avatar A. Unique TensorFlower Committed by TensorFlower Gardener
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Fix issue where re-entering a GradientTape context clears the tape 

* Changed behavior of GradientTape._push_tape() such that it always uses
  the existing tape if one is present.
* GradientTape.reset() clears the tape
* Added testGradientTapeReEnterContext to backprop_test.py

PiperOrigin-RevId: 212029862
parent 6d25ff7a
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