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#include "tensorflow/cc/ops/const_op.h"
17#include "tensorflow/core/framework/types.h"
18
19namespace tensorflow {
20namespace ops {
21
22namespace {
23template <typename T>
24Output ConstHelper(const Scope& scope, const T& value, DataType dtype) {
25 if (!scope.ok()) return Output();
26
27 Node* ret;
28 Graph* graph = scope.graph();
29 const string unique_name = scope.GetUniqueNameForOp("Const");
30 auto builder = NodeBuilder(unique_name, "Const")
31 .Attr("value", value)
32 .Attr("dtype", dtype);
33 scope.UpdateBuilder(&builder);
34 scope.UpdateStatus(builder.Finalize(graph, &ret));
35 if (!scope.ok()) return Output();
36
37 scope.UpdateStatus(scope.DoShapeInference(ret));
38 if (!scope.ok()) return Output();
39
40 return Output(ret);
41}
42} // namespace
43
44Output Const(const Scope& scope, const Input::Initializer& val) {
45 if (!val.status.ok()) {
46 scope.UpdateStatus(val.status);
47 return Output();
48 }
49 return ConstHelper(scope, val.tensor, val.tensor.dtype());
50}
51
52Output ConstFromProto(const Scope& scope, const TensorProto& proto) {
53 return ConstHelper(scope, proto, proto.dtype());
54}
55
56NodeBuilder::NodeOut AsNodeOut(const Scope& scope, const Input& inp) {
57 if (!inp.status().ok()) {
58 scope.UpdateStatus(inp.status());
59 return NodeBuilder::NodeOut(inp.node(), inp.index());
60 }
61 if (inp.node()) {
62 return NodeBuilder::NodeOut(inp.node(), inp.index());
63 }
64 if (!inp.node_name().empty()) {
65 return NodeBuilder::NodeOut(inp.node_name(), inp.index(), inp.data_type());
66 }
67 auto transformed = Input{
68 Const(scope.NewSubScope("Const"), Input::Initializer(inp.tensor()))};
69 return NodeBuilder::NodeOut{transformed.node(), transformed.index()};
70}
71
72std::vector<NodeBuilder::NodeOut> AsNodeOutList(const Scope& scope,
73 const InputList& inp) {
74 std::vector<NodeBuilder::NodeOut> out;
75 for (const auto& i : inp) {
76 const auto node_out = AsNodeOut(scope, i);
77 if (!scope.ok()) {
78 return {};
79 }
80 out.push_back(node_out);
81 }
82 return out;
83}
84
85} // namespace ops
86} // namespace tensorflow
87