Function mindspore::dataset::Album

Function Documentation

inline std::shared_ptr<AlbumDataset> mindspore::dataset::Album(const std::string &dataset_dir, const std::string &data_schema, const std::vector<std::string> &column_names = {}, bool decode = false, const std::shared_ptr<Sampler> &sampler = std::make_shared<RandomSampler>(), const std::shared_ptr<DatasetCache> &cache = nullptr)

Function to create an AlbumDataset.

Note

The generated dataset is specified through setting a schema

Parameters

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

  • data_schema – [in] Path to dataset schema file

  • column_names – [in] Column names used to specify columns to load, if empty, will read all columns. (default = {})

  • 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 current Dataset

样例
/* Define dataset path and MindData object */
std::string folder_path = "/path/to/album_dataset_directory";
std::string schema_file = "/path/to/album_schema_file";
std::vector<std::string> column_names = {"image", "label", "id"};
std::shared_ptr<Dataset> ds = Album(folder_path, schema_file, column_names);

/* Create iterator to read dataset */
std::shared_ptr<Iterator> iter = ds->CreateIterator();
std::unordered_map<std::string, mindspore::MSTensor> row;
iter->GetNextRow(&row);

/* Note: As we defined before, each data dictionary owns keys "image", "label" and "id" */
auto image = row["image"];