| # Copyright 2019 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. |
| # ============================================================================== |
| """FuncGraphs for V2 control flow.""" |
| |
| from tensorflow.python.framework import func_graph |
| from tensorflow.python.framework import ops |
| |
| |
| class ControlFlowFuncGraph(func_graph.FuncGraph): |
| """Contains control flow-specific FuncGraph logic.""" |
| |
| def __init__(self, *args, **kwargs): |
| super(ControlFlowFuncGraph, self).__init__(*args, **kwargs) |
| outer_graph = self.outer_graph |
| # Unlike tf.function, control flow FuncGraphs are generally created one per |
| # op. This means hard-coding any outer device scopes in the body (rather |
| # than inspecting the call-time placement of the control flow op) makes |
| # sense. |
| self._device_function_stack = outer_graph._device_function_stack.copy() # pylint: disable=protected-access |
| self.is_control_flow_graph = True |
| if ops.executing_eagerly_outside_functions(): |
| func_graph.override_func_graph_name_scope( |
| self, self.outer_graph.get_name_scope()) |
| |
| |
| class CondBranchFuncGraph(ControlFlowFuncGraph): |
| """FuncGraph for branches of tf.cond(). |
| |
| This is used to distinguish cond branches from other functions. |
| """ |
| |
| |
| class WhileCondFuncGraph(ControlFlowFuncGraph): |
| """FuncGraph for the condition of tf.while_loop(). |
| |
| This is used to distinguish while conditions from other functions. |
| """ |
| |
| |
| class WhileBodyFuncGraph(ControlFlowFuncGraph): |
| """FuncGraph for the body of tf.while_loop(). |
| |
| This is used to distinguish while bodies from other functions. |
| """ |