79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
// Copyright 2022 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/util/label_map_util.h"
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#include <string>
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#include <vector>
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#include "absl/strings/str_format.h"
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#include "absl/strings/str_split.h"
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#include "absl/strings/string_view.h"
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#include "mediapipe/framework/port/statusor.h"
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#include "mediapipe/util/label_map.pb.h"
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namespace mediapipe {
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absl::StatusOr<proto_ns::Map<int64, LabelMapItem>> BuildLabelMapFromFiles(
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absl::string_view labels_file_contents,
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absl::string_view display_names_file) {
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if (labels_file_contents.empty()) {
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return absl::InvalidArgumentError("Expected non-empty labels file.");
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}
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std::vector<absl::string_view> labels =
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absl::StrSplit(labels_file_contents, '\n');
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// In most cases, there is an empty line (i.e. newline character) at the end
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// of the file that needs to be ignored. In such a situation, StrSplit() will
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// produce a vector with an empty string as final element. Also note that in
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// case `labels_file_contents` is entirely empty, StrSplit() will produce a
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// vector with one single empty substring, so there's no out-of-range risk
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// here.
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if (labels[labels.size() - 1].empty()) {
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labels.pop_back();
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}
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std::vector<LabelMapItem> label_map_items;
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label_map_items.reserve(labels.size());
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for (int i = 0; i < labels.size(); ++i) {
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LabelMapItem item;
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item.set_name(std::string(labels[i]));
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label_map_items.emplace_back(item);
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}
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if (!display_names_file.empty()) {
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std::vector<std::string> display_names =
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absl::StrSplit(display_names_file, '\n');
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// In most cases, there is an empty line (i.e. newline character) at the end
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// of the file that needs to be ignored. See above.
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if (display_names[display_names.size() - 1].empty()) {
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display_names.pop_back();
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}
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if (display_names.size() != labels.size()) {
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return absl::InvalidArgumentError(absl::StrFormat(
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"Mismatch between number of labels (%d) and display names (%d).",
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labels.size(), display_names.size()));
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}
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for (int i = 0; i < display_names.size(); ++i) {
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label_map_items[i].set_display_name(display_names[i]);
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}
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}
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proto_ns::Map<int64, LabelMapItem> label_map;
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for (int i = 0; i < label_map_items.size(); ++i) {
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label_map[i] = label_map_items[i];
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}
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return label_map;
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}
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} // namespace mediapipe
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