| # Copyright 2018 The TensorFlow Authors. All Rights Reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # ============================================================================== |
| """Gradient functions for optional ops.""" |
| |
| from tensorflow.python.framework import ops |
| from tensorflow.python.ops import gen_optional_ops |
| |
| |
| @ops.RegisterGradient("OptionalFromValue") |
| def _OptionalFromValueGrad(op, grad): |
| return gen_optional_ops.optional_get_value( |
| grad, [t.dtype for t in op.inputs], [t.shape for t in op.inputs] |
| ) |
| |
| |
| @ops.RegisterGradient("OptionalGetValue") |
| def _OptionalGetValueGrad(unused_op, *grads): |
| return gen_optional_ops.optional_from_value(grads) |