Paddle/doc_cn/ui/data_provider/mnist_provider.py

from paddle.trainer.PyDataProvider2 import *


# Define a py data provider
@provider(input_types=[
    dense_vector(28 * 28),
    integer_value(10)
])
def process(settings, filename):  # settings is not used currently.
    f = open(filename, 'r')  # open one of training file

    for line in f:  # read each line
        label, pixel = line.split(';')

        # get features and label
        pixels_str = pixel.split(' ')

        pixels_float = []
        for each_pixel_str in pixels_str:
            pixels_float.append(float(each_pixel_str))

        # give data to paddle.
        yield pixels_float, int(label)

    f.close()  # close file