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1

MNIST WebDataset PNG

The MNIST dataset with samples stored as PNG images and compiled into the WebDataset format.

DALI/JAX Example

The following code shows how this dataset can be loaded into JAX arrays by DALI.

from nvidia.dali import pipeline_def
import nvidia.dali.fn as fn
import nvidia.dali.types as types
from nvidia.dali.plugin.jax import DALIGenericIterator
from nvidia.dali.plugin.base_iterator import LastBatchPolicy

def get_data_iterator(batch_size, dataset_path):
    @pipeline_def(batch_size=batch_size, num_threads=4, device_id=0)
    def wds_pipeline():
        raw_image, ascii_label = fn.readers.webdataset(
            paths=dataset_path, 
            ext=['png', 'cls'], 
            missing_component_behavior='error',
        )
        image = fn.decoders.image(raw_image)
        ascii_shift = types.Constant(48).uint8()
        label = ascii_label - ascii_shift
        return image, label

    data_pipeline = wds_pipeline()
    data_iterator = DALIGenericIterator(
        pipelines=[data_pipeline], 
        output_map=['x', 'y'], 
        last_batch_policy=LastBatchPolicy.DROP
    )
    return data_iterator

data_iterator = get_data_iterator(
    batch_size=32, 
    dataset_path='data/mnist_webdataset_numpy_flat_9/data.tar'
)
batch = next(data_iterator)
x = batch['x']
y = batch['y']
print('x shape:', x.shape)
print('y shape:', y.shape)
print('y:', y[:, 0])

Output:

x shape: (32, 28, 28, 3)
y shape: (32, 1)
y: [5 0 4 1 9 2 1 3 1 4 3 5 3 6 1 7 2 8 6 9 4 0 9 1 1 2 4 3 2 7 3 8]

Acknowledgements

  • Yann LeCun, Courant Institute, NYU
  • Corinna Cortes, Google Labs, New York
  • Christopher J.C. Burges, Microsoft Research, Redmond
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