text: # Copyright 2021 Huawei Technologies Co., Ltd
  #
  # 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.
  # ===========================================================================
  """generate json desc for relu_grad"""
  from ._utils import Expander, ExpanderInfoValidator as VLD
  
  
  @VLD.check_all_formats_same
  class ReluGrad(Expander):
      """ReLU expander"""
  
      def _expand(self, graph_builder):
          input_x = self.inputs[0]
          input_y = self.inputs[1]
  
          const_zero = graph_builder.value(input_y.dtype, 0)
          ge_result = graph_builder.emit('Greater', [input_y, const_zero])
          ge_result = graph_builder.emit('Cast', [ge_result], attrs={'dst_type': input_x.dtype})
          result = graph_builder.emit('Mul', [ge_result, input_x])
  
          return result
  