Paddle/doc_cn/ui/data_provider/mnist_config.py

from paddle.trainer_config_helpers import *

define_py_data_sources2(train_list='train.list',
                        test_list=None,
                        module='mnist_provider',
                        obj='process')
img = data_layer(name='pixel', size=784)
label = data_layer(name='label', size=10)