57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
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# Copyright 2019 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""FuncGraphs for V2 control flow."""
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from tensorflow.python.framework import func_graph
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from tensorflow.python.framework import ops
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class ControlFlowFuncGraph(func_graph.FuncGraph):
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"""Contains control flow-specific FuncGraph logic."""
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def __init__(self, *args, **kwargs):
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super(ControlFlowFuncGraph, self).__init__(*args, **kwargs)
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outer_graph = self.outer_graph
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# Unlike tf.function, control flow FuncGraphs are generally created one per
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# op. This means hard-coding any outer device scopes in the body (rather
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# than inspecting the call-time placement of the control flow op) makes
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# sense.
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self._device_function_stack = outer_graph._device_function_stack.copy() # pylint: disable=protected-access
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self.is_control_flow_graph = True
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if ops.executing_eagerly_outside_functions():
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func_graph.override_func_graph_name_scope(
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self, self.outer_graph.get_name_scope())
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class CondBranchFuncGraph(ControlFlowFuncGraph):
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"""FuncGraph for branches of tf.cond().
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This is used to distinguish cond branches from other functions.
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"""
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class WhileCondFuncGraph(ControlFlowFuncGraph):
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"""FuncGraph for the condition of tf.while_loop().
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This is used to distinguish while conditions from other functions.
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"""
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class WhileBodyFuncGraph(ControlFlowFuncGraph):
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"""FuncGraph for the body of tf.while_loop().
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This is used to distinguish while bodies from other functions.
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"""
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