1/* Copyright 2016 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_CC_OPS_CONST_OP_H_
17#define TENSORFLOW_CC_OPS_CONST_OP_H_
18
19#include <vector>
20
21#include "tensorflow/cc/framework/ops.h"
22#include "tensorflow/cc/framework/scope.h"
23#include "tensorflow/core/graph/node_builder.h"
24
25namespace tensorflow {
26namespace ops {
27
28/// @defgroup const_op Const Op
29/// @{
30
31Output Const(const Scope& scope, const Input::Initializer& val);
32
33Output ConstFromProto(const Scope& scope, const TensorProto& proto);
34
35NodeBuilder::NodeOut AsNodeOut(const Scope& scope, const Input& inp);
36
37template <typename T>
38Output Const(const Scope& scope, const Input::Initializer& val) {
39 auto orig_const_output = Const(scope, val);
40 if (!scope.ok()) return Output();
41
42 typedef typename Input::Initializer::RealType<T>::type DstT;
43
44 if (val.tensor.dtype() == DataTypeToEnum<DstT>::v()) {
45 return orig_const_output;
46 }
47 if (val.tensor.NumElements() == 0) {
48 Tensor t(DataTypeToEnum<DstT>::v(), val.tensor.shape());
49 return Const(scope, Input::Initializer(t));
50 }
51
52 // TODO(keveman): Refactor Cast op's kernel implementation such that the code
53 // can be directly called here instead of adding the Cast op to the graph.
54 auto orig_const = AsNodeOut(scope, orig_const_output);
55 const auto cast_op_name = scope.GetUniqueNameForOp("Cast");
56
57 auto cast_builder = NodeBuilder(cast_op_name, "Cast")
58 .Input(orig_const)
59 .Attr("DstT", DataTypeToEnum<DstT>::v());
60 scope.UpdateBuilder(&cast_builder);
61 Node* ret;
62 scope.UpdateStatus(cast_builder.Finalize(scope.graph(), &ret));
63 if (!scope.ok()) return Output();
64 scope.UpdateStatus(scope.DoShapeInference(ret));
65 return Output(ret, 0);
66}
67
68template <typename T>
69Output Const(const Scope& scope, const T& v, const TensorShape shape) {
70 return Const(scope, Input::Initializer(v, shape));
71}
72
73template <typename T>
74Output Const(const Scope& scope, const std::initializer_list<T>& v,
75 const TensorShape shape) {
76 return Const(scope, Input::Initializer(v, shape));
77}
78
79std::vector<NodeBuilder::NodeOut> AsNodeOutList(const Scope& scope,
80 const InputList& inp);
81
82/// }@
83
84} // namespace ops
85} // namespace tensorflow
86
87#endif // TENSORFLOW_CC_OPS_CONST_OP_H_
88