1/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#ifndef TENSORFLOW_CORE_KERNELS_ASSIGN_OP_H_
17#define TENSORFLOW_CORE_KERNELS_ASSIGN_OP_H_
18
19#define EIGEN_USE_THREADS
20
21#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
22#include "tensorflow/core/framework/op_kernel.h"
23#include "tensorflow/core/framework/ref_var.h"
24#include "tensorflow/core/framework/tensor_types.h"
25
26namespace tensorflow {
27
28// TODO(jeff): Get rid of use_exclusive_lock_ option
29
30// Computes *input[0] = input[1]
31class AssignOp : public OpKernel {
32 public:
33 explicit AssignOp(OpKernelConstruction* context) : OpKernel(context) {
34 OP_REQUIRES_OK(context,
35 context->GetAttr("use_locking", &use_exclusive_lock_));
36 OP_REQUIRES_OK(context,
37 context->GetAttr("validate_shape", &validate_shape_));
38 OP_REQUIRES(context, IsRefType(context->input_type(0)),
39 errors::InvalidArgument("lhs input needs to be a ref type"));
40 if (!context
41 ->GetAttr("_grappler_relax_allocator_constraints",
42 &relax_constraints_)
43 .ok()) {
44 relax_constraints_ = false;
45 }
46 }
47
48 void Compute(OpKernelContext* context) override {
49 constexpr int input_ref_index = 0;
50 constexpr int output_ref_index = 0;
51 constexpr int value_index = 1;
52
53 auto copy = [this](OpKernelContext* cc_ctx, Tensor* lhs,
54 const Tensor& rhs) { Copy(cc_ctx, lhs, rhs); };
55
56 AssignRefVariable(context, input_ref_index, output_ref_index, value_index,
57 use_exclusive_lock_, validate_shape_, relax_constraints_,
58 copy);
59 }
60
61 virtual void Copy(OpKernelContext* context, Tensor* lhs,
62 const Tensor& rhs) = 0;
63
64 bool use_exclusive_lock_;
65 bool validate_shape_;
66 bool relax_constraints_;
67};
68
69} // end namespace tensorflow
70
71#endif // TENSORFLOW_CORE_KERNELS_ASSIGN_OP_H_
72