1 /* Copyright 2020 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #ifndef TENSORFLOW_LITE_SUPPORT_CC_TASK_TEXT_QA_QUESTION_ANSWERER_H_ 17 #define TENSORFLOW_LITE_SUPPORT_CC_TASK_TEXT_QA_QUESTION_ANSWERER_H_ 18 19 #include <string> 20 #include <utility> 21 #include <vector> 22 23 #include "tensorflow_lite_support/cc/task/core/base_task_api.h" 24 #include "tensorflow_lite_support/cc/task/core/tflite_engine.h" 25 26 namespace tflite { 27 namespace task { 28 namespace text { 29 namespace qa { 30 31 // Struct for the Answer to QuestionAnswerer. 32 struct QaAnswer { 33 // struct to represent the logit and offset of the answer related to context. 34 struct Pos { PosQaAnswer::Pos35 Pos(int arg_start, int arg_end, float arg_logit) 36 : start(arg_start), end(arg_end), logit(arg_logit) {} 37 int start, end; 38 float logit; 39 bool operator<(const Pos& rhs) const { return rhs.logit < logit; } 40 }; 41 QaAnswerQaAnswer42 QaAnswer(std::string arg_text, Pos arg_pos) 43 : text(std::move(arg_text)), pos(arg_pos) {} 44 std::string text; 45 Pos pos; 46 }; 47 48 // Interface for an Question-Answer API. 49 class QuestionAnswerer 50 : public core::BaseTaskApi<std::vector<QaAnswer>, const std::string&, 51 const std::string&> { 52 public: QuestionAnswerer(std::unique_ptr<core::TfLiteEngine> engine)53 explicit QuestionAnswerer(std::unique_ptr<core::TfLiteEngine> engine) 54 : BaseTaskApi(std::move(engine)) {} 55 56 virtual std::vector<QaAnswer> Answer(const std::string& context, 57 const std::string& question) = 0; 58 }; 59 60 } // namespace qa 61 } // namespace text 62 } // namespace task 63 } // namespace tflite 64 65 #endif // TENSORFLOW_LITE_SUPPORT_CC_TASK_TEXT_QA_QUESTION_ANSWERER_H_ 66