Function mindspore::dataset::WIDERFace

• Defined in File datasets.h

Function Documentation

inline std::shared_ptr<WIDERFaceDataset> mindspore::dataset::WIDERFace(const std::string &dataset_dir, const std::string &usage = "all", bool decode = false, const std::shared_ptr<Sampler> &sampler = std::make_shared<RandomSampler>(), const std::shared_ptr<DatasetCache> &cache = nullptr)

Function to create a WIDERFace Dataset.

Note

When usage is “train”, “valid” or “all”, the generated dataset has eight columns [“image”, “bbox”, “blur”, “expression”, “illumination”, “occlusion”, “pose”, “invalid”]. When usage is “test”, it only has one column [“image”].

Parameters

• dataset_dir – [in] Path to the root directory that contains the dataset.

• usage – [in] The type of data to be read, can be “train”, “test”, “valid” or “all” (default=”all”). “all” will read samples from “train” and “valid”.

• decode – [in] The option to decode the images in dataset (default = false).

• sampler – [in] Shared pointer to a sampler object used to choose samples from the dataset. If sampler is not given, a RandomSampler will be used to randomly iterate the entire dataset (default = RandomSampler()).

• cache – [in] Tensor cache to use (default=nullptr, which means no cache is used).

Returns

Shared pointer to the WIDERFaceDataset.

样例

        /* Define dataset path and MindData object */
        std::string folder_path = "/path/to/wider_face_dataset_directory";
        std::shared_ptr<Dataset> ds = WIDERFace(folder_path, "train", std::make_shared<SequentialSampler>(0, 2));
  
        /* Create iterator to read dataset */
        std::shared_ptr<Iterator> iter = ds->CreateIterator();
        std::unordered_map<std::string, mindspore::MSTensor> row;
        iter->GetNextRow(&row);
  
        /* Note: In WIDERFace dataset, if task='test', each dictionary has key "image" */
        /* Note: In WIDERFace dataset, if task='all', 'train' or 'valid', each dictionary has keys "image", "bbox",
*       "blur", "expression", "illumination", "occlusion", "pose", "invalid" */
        auto image = row["image"];