| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef KNOWLEDGE_CEREBRA_SENSE_TEXT_CLASSIFIER_LIB2_CACHED_FEATURES_H_ |
| #define KNOWLEDGE_CEREBRA_SENSE_TEXT_CLASSIFIER_LIB2_CACHED_FEATURES_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "model-executor.h" |
| #include "model_generated.h" |
| #include "types.h" |
| |
| namespace libtextclassifier2 { |
| |
| // Holds state for extracting features across multiple calls and reusing them. |
| // Assumes that features for each Token are independent. |
| class CachedFeatures { |
| public: |
| CachedFeatures( |
| const TokenSpan& extraction_span, |
| const std::vector<std::vector<int>>& sparse_features, |
| const std::vector<std::vector<float>>& dense_features, |
| const std::vector<int>& padding_sparse_features, |
| const std::vector<float>& padding_dense_features, |
| const FeatureProcessorOptions_::BoundsSensitiveFeatures* config, |
| EmbeddingExecutor* embedding_executor, int feature_vector_size); |
| |
| // Gets a vector of features for the given token span. |
| std::vector<float> Get(TokenSpan selected_span) const; |
| |
| private: |
| // Appends token features to the output. The intended_span specifies which |
| // tokens' features should be used in principle. The read_mask_span restricts |
| // which tokens are actually read. For tokens outside of the read_mask_span, |
| // padding tokens are used instead. |
| void AppendFeatures(const TokenSpan& intended_span, |
| const TokenSpan& read_mask_span, |
| std::vector<float>* output_features) const; |
| |
| // Appends features of one padding token to the output. |
| void AppendPaddingFeatures(std::vector<float>* output_features) const; |
| |
| // Appends the features of tokens from the given span to the output. The |
| // features are summed so that the appended features have the size |
| // corresponding to one token. |
| void AppendSummedFeatures(const TokenSpan& summing_span, |
| std::vector<float>* output_features) const; |
| |
| int NumFeaturesPerToken() const; |
| |
| const TokenSpan extraction_span_; |
| const FeatureProcessorOptions_::BoundsSensitiveFeatures* config_; |
| int output_features_size_; |
| std::vector<float> features_; |
| std::vector<float> padding_features_; |
| }; |
| |
| } // namespace libtextclassifier2 |
| |
| #endif // KNOWLEDGE_CEREBRA_SENSE_TEXT_CLASSIFIER_LIB2_CACHED_FEATURES_H_ |