| # Copyright 2017 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. |
| # ============================================================================== |
| """Decorator to overrides the gradient for a function.""" |
| |
| from tensorflow.python.client import pywrap_tf_session |
| from tensorflow.python.framework import cpp_shape_inference_pb2 |
| from tensorflow.python.framework import dtypes |
| from tensorflow.python.types import core |
| from tensorflow.python.util import compat |
| |
| |
| def get_resource_handle_data(graph_op): |
| assert (isinstance(graph_op, core.Symbol) |
| and not isinstance(graph_op, core.Value)) |
| |
| with graph_op.graph._c_graph.get() as c_graph: # pylint: disable=protected-access |
| handle_data = pywrap_tf_session.GetHandleShapeAndType( |
| c_graph, graph_op._as_tf_output()) # pylint: disable=protected-access |
| |
| return cpp_shape_inference_pb2.CppShapeInferenceResult.HandleData.FromString( |
| compat.as_bytes(handle_data)) |
| |
| |
| def get_handle_data(source_t): |
| """Obtains HandleData from a tensor.""" |
| if isinstance(source_t, core.Value): |
| return source_t._handle_data # pylint: disable=protected-access |
| return get_resource_handle_data(source_t) |
| |
| |
| def copy_handle_data(source_t, target_t): |
| """Copies HandleData for variant and resource type tensors if available. |
| |
| The CppShapeInferenceResult::HandleData proto contains information about the |
| shapes and types of the element tensors of resource/variant type tensors. |
| We need to copy this across function boundaries, i.e., when capturing a |
| placeholder or when returning a function tensor as output. If we don't do this |
| the element tensors will have unknown shapes, e.g., if a TensorList variant |
| tensor is captured as a placeholder, elements popped from that list would have |
| unknown shape. |
| |
| Args: |
| source_t: The tensor to copy HandleData from. |
| target_t: The tensor to copy HandleData to. |
| """ |
| if (target_t.dtype == dtypes.resource or |
| target_t.dtype == dtypes.variant): |
| handle_data = get_handle_data(source_t) |
| set_handle_data(target_t, handle_data) |
| |
| |
| def set_handle_data(target_t, handle_data): |
| """Sets handle data on the giver tensor.""" |
| if ( |
| handle_data is None |
| or not handle_data.is_set |
| or not handle_data.shape_and_type |
| ): |
| return |
| |
| # pylint: disable=protected-access |
| if isinstance(target_t, core.Value): |
| target_t._handle_data = handle_data |
| return |
| with target_t.graph._c_graph.get() as c_graph: |
| pywrap_tf_session.SetHandleShapeAndType(c_graph, target_t._as_tf_output(), |
| handle_data.SerializeToString()) |
| # pylint: enable=protected-access |
| |
| |
| def create_handle_data(shape, dtype): |
| handle_data = cpp_shape_inference_pb2.CppShapeInferenceResult.HandleData() |
| handle_data.is_set = True |
| handle_data.shape_and_type.append( |
| cpp_shape_inference_pb2.CppShapeInferenceResult.HandleShapeAndType( |
| shape=shape.as_proto(), dtype=dtype.as_datatype_enum)) |
| return handle_data |