1/* Copyright 2017 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#include <cstdio>
16#include <memory>
17#include <string>
18
19#include "absl/strings/string_view.h"
20#include "tensorflow/lite/toco/model.h"
21#include "tensorflow/lite/toco/model_cmdline_flags.h"
22#include "tensorflow/lite/toco/model_flags.pb.h"
23#include "tensorflow/lite/toco/toco_cmdline_flags.h"
24#include "tensorflow/lite/toco/toco_flags.pb.h"
25#include "tensorflow/lite/toco/toco_port.h"
26#include "tensorflow/lite/toco/toco_tooling.h"
27#include "tensorflow/lite/toco/toco_types.h"
28#include "tensorflow/core/lib/core/errors.h"
29#include "tensorflow/core/platform/logging.h"
30
31namespace toco {
32namespace {
33
34// Checks the permissions of the output file to ensure it is writeable.
35void CheckOutputFilePermissions(const Arg<std::string>& output_file) {
36 QCHECK(output_file.specified()) << "Missing required flag --output_file.\n";
37 QCHECK(port::file::Writable(output_file.value()).ok())
38 << "Specified output_file is not writable: " << output_file.value()
39 << ".\n";
40}
41
42// Checks the permissions of the frozen model file.
43void CheckFrozenModelPermissions(const Arg<std::string>& input_file) {
44 QCHECK(input_file.specified()) << "Missing required flag --input_file.\n";
45 QCHECK(port::file::Exists(input_file.value(), port::file::Defaults()).ok())
46 << "Specified input_file does not exist: " << input_file.value() << ".\n";
47 QCHECK(port::file::Readable(input_file.value(), port::file::Defaults()).ok())
48 << "Specified input_file exists, but is not readable: "
49 << input_file.value() << ".\n";
50}
51
52// Reads the contents of the GraphDef from either the frozen graph file or the
53// SavedModel directory. If it reads the SavedModel directory, it updates the
54// ModelFlags and TocoFlags accordingly.
55void ReadInputData(const ParsedTocoFlags& parsed_toco_flags,
56 const ParsedModelFlags& parsed_model_flags,
57 std::string* graph_def_contents) {
58 port::CheckInitGoogleIsDone("InitGoogle is not done yet.\n");
59
60 // Ensure savedmodel_directory is not set.
61 QCHECK(!parsed_toco_flags.savedmodel_directory.specified())
62 << "Use `tensorflow/lite/python/tflite_convert` script with "
63 << "SavedModel directories.\n";
64
65 // Checks the input file permissions and reads the contents.
66 CheckFrozenModelPermissions(parsed_toco_flags.input_file);
67 CHECK(port::file::GetContents(parsed_toco_flags.input_file.value(),
68 graph_def_contents, port::file::Defaults())
69 .ok());
70}
71} // namespace
72
73tensorflow::Status Convert(const std::string& graph_def_contents,
74 const TocoFlags& toco_flags,
75 const ModelFlags& model_flags,
76 std::string* output_file_contents,
77 int64_t* arithmetic_ops_count = nullptr) {
78 std::unique_ptr<Model> model =
79 Import(toco_flags, model_flags, graph_def_contents);
80 TF_RETURN_IF_ERROR(TransformWithStatus(toco_flags, model.get()));
81 TF_RETURN_IF_ERROR(Export(toco_flags, *model, toco_flags.allow_custom_ops(),
82 output_file_contents));
83 if (arithmetic_ops_count != nullptr) {
84 *arithmetic_ops_count = model->ArithmeticOpsCount();
85 }
86 return ::tensorflow::OkStatus();
87}
88
89tensorflow::Status Convert(const ParsedTocoFlags& parsed_toco_flags,
90 const ParsedModelFlags& parsed_model_flags) {
91 ModelFlags model_flags;
92 ReadModelFlagsFromCommandLineFlags(parsed_model_flags, &model_flags);
93
94 TocoFlags toco_flags;
95 ReadTocoFlagsFromCommandLineFlags(parsed_toco_flags, &toco_flags);
96
97 std::string graph_def_contents;
98 ReadInputData(parsed_toco_flags, parsed_model_flags, &graph_def_contents);
99 CheckOutputFilePermissions(parsed_toco_flags.output_file);
100
101 std::string output_file_contents;
102 TF_RETURN_IF_ERROR(Convert(graph_def_contents, toco_flags, model_flags,
103 &output_file_contents));
104
105 TF_RETURN_IF_ERROR(
106 port::file::SetContents(parsed_toco_flags.output_file.value(),
107 output_file_contents, port::file::Defaults()));
108 return tensorflow::Status();
109}
110
111} // namespace toco
112