Function mindspore::dataset::Mnist
Defined in File datasets.h
Function Documentation
Function to create a MnistDataset.
Note
The generated dataset has two columns [“image”, “label”]
- Parameters
dataset_dir – [in] Path to the root directory that contains the dataset
usage – [in] of MNIST, can be “train”, “test” or “all” (default = “all”).
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 MnistDataset
样例/* Define dataset path and MindData object */ std::string folder_path = "/path/to/mnist_dataset_directory"; std::shared_ptr<Dataset> ds = Mnist(folder_path, "all", std::make_shared<RandomSampler>(false, 20)); /* 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 MNIST dataset, each dictionary has keys "image" and "label" */ auto image = row["image"];