You're reading the documentation of the 0.2. For the latest released version, please have a look at 0.4.

merlin.datasets.mnist_digits module

merlin.datasets.mnist_digits.get_data_test_original()

merlin.datasets.mnist_digits.get_data_test_percevalquest()

merlin.datasets.mnist_digits.get_data_train_original()

merlin.datasets.mnist_digits.get_data_train_percevalquest()