old_contents: #   Copyright (c) 2018 PaddlePaddle 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.
  
  LOOKUP_TABLE_TYPE = "lookup_table"
  
  
  def find_distributed_lookup_table(program):
      # process lookup_table_op
      # 1. check all lookup_table_op is distributed
      # 2. check all lookup_table_op share the same table.
      distributed_lookup_table_ops = []
      # support only one distributed_lookup_table now
      table_name = None
  
      for op in program.global_block().ops:
          if op.type == LOOKUP_TABLE_TYPE:
              if op.attr('is_distributed') is True:
                  if table_name is None:
                      table_name = op.input("W")[0]
                  if table_name != op.input("W")[0]:
                      raise RuntimeError("all distributed lookup_table_ops"
                                         " should have only one table")
                  distributed_lookup_table_ops.append(op)
              else:
                  if table_name is not None:
                      assert op.input("W")[0] != table_name
  
      return table_name
  
new_contents: #   Copyright (c) 2018 PaddlePaddle 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.
  
  LOOKUP_TABLE_TYPE = "lookup_table"
  
  
  def find_distributed_lookup_table(program):
      """
      Find distribute lookup table in program.
      We only support one distribute table now.
      :param program:
      :return: table_name or None
      """
      table_name = None
  
      for op in program.global_block().ops:
          if op.type == LOOKUP_TABLE_TYPE:
              if op.attr('is_distributed') is True:
                  if table_name is None:
                      table_name = op.input("W")[0]
                  if table_name != op.input("W")[0]:
                      raise RuntimeError("all distributed lookup_table_ops"
                                         " should have only one table")
              else:
                  if table_name is not None:
                      assert op.input("W")[0] != table_name
  
      return table_name
  
subject: optimize code test=develop