1"""Gradients for XLA ops.""" 2# Copyright 2018 The TensorFlow Authors. All Rights Reserved. 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15# ============================================================================== 16 17from __future__ import absolute_import 18from __future__ import division 19from __future__ import print_function 20 21from tensorflow.python.framework import ops 22 23 24@ops.RegisterGradient("XlaClusterOutput") 25def _XlaClusterOutputGrad(_, grad): 26 del grad # unused 27 raise RuntimeError("Gradient computation of graph in xla.compile() is " 28 "prohibited because it can cause performance degradation." 29 "Please move gradient computation inside xla.compile().") 30