| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 SINGA_IO_DECODER_H_ |
| #define SINGA_IO_DECODER_H_ |
| |
| #include <vector> |
| #include <string> |
| #include "singa/core/tensor.h" |
| #include "singa/proto/io.pb.h" |
| |
| namespace singa { |
| /// The base decoder that converts a string into a set of tensors. |
| class Decoder { |
| public: |
| Decoder() { } |
| virtual ~Decoder() { } |
| |
| virtual void Setup(const DecoderConf& conf) {} |
| |
| /// Decode value to get data and labels |
| virtual std::vector<Tensor> Decode(std::string value) = 0; |
| }; |
| |
| #ifdef USE_OPENCV |
| /// Decode the string as an ImageRecord object and convert it into a image |
| /// tensor (dtype is kFloat32) and a label tensor (dtype is kInt). |
| class JPGDecoder : public Decoder { |
| public: |
| void Setup(const DecoderConf& conf) override { |
| image_dim_order_ = conf.image_dim_order(); |
| } |
| std::vector<Tensor> Decode(std::string value) override; |
| |
| const std::string image_dim_order() const { return image_dim_order_; } |
| |
| private: |
| /// Indicate the dimension order for the output image tensor. |
| std::string image_dim_order_ = "CHW"; |
| }; |
| #endif |
| |
| /// Decode the string of csv formated data into data tensor |
| /// (dtype is kFloat32) and optionally a label tensor (dtype is kInt). |
| class CSVDecoder : public Decoder { |
| public: |
| void Setup(const DecoderConf& conf) override { |
| has_label_ = conf.has_label(); |
| } |
| std::vector<Tensor> Decode(std::string value) override; |
| |
| bool has_label() const { return has_label_; } |
| |
| private: |
| /// if ture the first value is the label |
| bool has_label_ = false; |
| }; |
| } // namespace singa |
| #endif // SINGA_IO_DECODER_H_ |