Download the MNIST with mnist

download_mnist.rs

use mnist::*;

fn main()-> Result<(), Box<dyn, Error>>{
    // Deconstruct the returned Mnist struct.
    let Mnist {
        trn_img,
        trn_lbl,
        val_img, 
        val_lbl,
        tst_img,
        tst_lbl,
    } = MnistBuilder::new()
        .download_and_extract()
        .label_format_digit()
        .training_set_length(TRAIN_SIZE as u32)
        .validation_set_length(VAL_SIZE as u32)
        .test_set_length(TEST_SIZE as u32)
        .finalize();
    Ok(())
}