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download_mnist.py
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from __future__ import division
from __future__ import print_function
import argparse
import gzip
import os
import sys
import urllib
try:
from urllib.error import URLError
from urllib.request import urlretrieve
except ImportError:
from urllib2 import URLError
from urllib import urlretrieve
RESOURCES = [
'train-images-idx3-ubyte.gz',
'train-labels-idx1-ubyte.gz',
't10k-images-idx3-ubyte.gz',
't10k-labels-idx1-ubyte.gz',
]
def report_download_progress(chunk_number, chunk_size, file_size):
if file_size != -1:
percent = min(1, (chunk_number * chunk_size) / file_size)
bar = '#' * int(64 * percent)
sys.stdout.write('\r0% |{:<64}| {}%'.format(bar, int(percent * 100)))
def download(destination_path, url, quiet):
if os.path.exists(destination_path):
if not quiet:
print('{} already exists, skipping ...'.format(destination_path))
else:
print('Downloading {} ...'.format(url))
try:
hook = None if quiet else report_download_progress
urlretrieve(url, destination_path, reporthook=hook)
except URLError:
raise RuntimeError('Error downloading resource!')
finally:
if not quiet:
# Just a newline.
print()
def unzip(zipped_path, quiet):
unzipped_path = os.path.splitext(zipped_path)[0]
if os.path.exists(unzipped_path):
if not quiet:
print('{} already exists, skipping ... '.format(unzipped_path))
return
with gzip.open(zipped_path, 'rb') as zipped_file:
with open(unzipped_path, 'wb') as unzipped_file:
unzipped_file.write(zipped_file.read())
if not quiet:
print('Unzipped {} ...'.format(zipped_path))
def main():
parser = argparse.ArgumentParser(
description='Download the MNIST dataset from the internet')
parser.add_argument(
'-d', '--destination', default='.', help='Destination directory')
parser.add_argument(
'-q',
'--quiet',
action='store_true',
help="Don't report about progress")
options = parser.parse_args()
if not os.path.exists(options.destination):
os.makedirs(options.destination)
try:
for resource in RESOURCES:
path = os.path.join(options.destination, re
353A
source)
url = 'http://yann.lecun.com/exdb/mnist/{}'.format(resource)
download(path, url, options.quiet)
unzip(path, options.quiet)
except KeyboardInterrupt:
print('Interrupted')
if __name__ == '__main__':
main()