1/* Copyright 2021 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/lite/signature_runner.h"
17
18#include "tensorflow/lite/c/c_api_types.h"
19
20namespace tflite {
21
22SignatureRunner::SignatureRunner(const internal::SignatureDef* signature_def,
23 Subgraph* subgraph)
24 : signature_def_(signature_def), subgraph_(subgraph) {
25 // Collects the list of input and output tensor names.
26 for (const auto& it : signature_def_->inputs) {
27 input_names_.push_back(it.first.c_str());
28 }
29 for (const auto& it : signature_def_->outputs) {
30 output_names_.push_back(it.first.c_str());
31 }
32}
33
34TfLiteTensor* SignatureRunner::input_tensor(const char* input_name) {
35 const auto& it = signature_def_->inputs.find(input_name);
36 if (it == signature_def_->inputs.end()) {
37 subgraph_->ReportError("Input name %s was not found", input_name);
38 return nullptr;
39 }
40 return subgraph_->tensor(it->second);
41}
42
43const TfLiteTensor* SignatureRunner::output_tensor(
44 const char* output_name) const {
45 const auto& it = signature_def_->outputs.find(output_name);
46 if (it == signature_def_->outputs.end()) {
47 subgraph_->ReportError("Output name %s was not found", output_name);
48 return nullptr;
49 }
50 return subgraph_->tensor(it->second);
51}
52
53TfLiteStatus SignatureRunner::ResizeInputTensor(
54 const char* input_name, const std::vector<int>& new_size) {
55 const auto& it = signature_def_->inputs.find(input_name);
56 if (it == signature_def_->inputs.end()) {
57 subgraph_->ReportError("Input name %s was not found", input_name);
58 return kTfLiteError;
59 }
60 return subgraph_->ResizeInputTensor(it->second, new_size);
61}
62
63TfLiteStatus SignatureRunner::ResizeInputTensorStrict(
64 const char* input_name, const std::vector<int>& new_size) {
65 const auto& it = signature_def_->inputs.find(input_name);
66 if (it == signature_def_->inputs.end()) {
67 subgraph_->ReportError("Input name %s was not found", input_name);
68 return kTfLiteError;
69 }
70 return subgraph_->ResizeInputTensorStrict(it->second, new_size);
71}
72
73TfLiteStatus SignatureRunner::Invoke() {
74 TF_LITE_ENSURE_STATUS(subgraph_->Invoke());
75
76 // Makes sure output tensors are readable.
77 for (int tensor_index : subgraph_->outputs()) {
78 TF_LITE_ENSURE_STATUS(subgraph_->EnsureTensorDataIsReadable(tensor_index));
79 }
80 return kTfLiteOk;
81}
82
83} // namespace tflite
84