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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""MNIST handwritten digits dataset."""

import numpy as np

from keras.utils.data_utils import get_file
from tensorflow.python.util.tf_export import keras_export


@keras_export('keras.datasets.mnist.load_data')
def load_data(path='mnist.npz'):
  """Loads the MNIST dataset.

  This is a dataset of 60,000 28x28 grayscale images of the 10 digits,
  along with a test set of 10,000 images.
  More info can be found at the
  [MNIST homepage](http://yann.lecun.com/exdb/mnist/).

  Args:
    path: path where to cache the dataset locally
      (relative to `~/.keras/datasets`).

  Returns:
    Tuple of NumPy arrays: `(x_train, y_train), (x_test, y_test)`.

  **x_train**: uint8 NumPy array of grayscale image data with shapes
    `(60000, 28, 28)`, containing the training data. Pixel values range
    from 0 to 255.

  **y_train**: uint8 NumPy array of digit labels (integers in range 0-9)
    with shape `(60000,)` for the training data.

  **x_test**: uint8 NumPy array of grayscale image data with shapes
    (10000, 28, 28), containing the test data. Pixel values range
    from 0 to 255.

  **y_test**: uint8 NumPy array of digit labels (integers in range 0-9)
    with shape `(10000,)` for the test data.

  Example:

  ```python
  (x_train, y_train), (x_test, y_test) = keras.datasets.mnist.load_data()
  assert x_train.shape == (60000, 28, 28)
  assert x_test.shape == (10000, 28, 28)
  assert y_train.shape == (60000,)
  assert y_test.shape == (10000,)
  ```

  License:
    Yann LeCun and Corinna Cortes hold the copyright of MNIST dataset,
    which is a derivative work from original NIST datasets.
    MNIST dataset is made available under the terms of the
    [Creative Commons Attribution-Share Alike 3.0 license.](
    https://creativecommons.org/licenses/by-sa/3.0/)
  """
  origin_folder = 'https://storage.googleapis.com/tensorflow/tf-keras-datasets/'
  path = get_file(
      path,
      origin=origin_folder + 'mnist.npz',
      file_hash=
      '731c5ac602752760c8e48fbffcf8c3b850d9dc2a2aedcf2cc48468fc17b673d1')
  with np.load(path, allow_pickle=True) as f:  # pylint: disable=unexpected-keyword-arg
    x_train, y_train = f['x_train'], f['y_train']
    x_test, y_test = f['x_test'], f['y_test']

    return (x_train, y_train), (x_test, y_test)