Merge pull request #1383 from eyumboo/dev-postgresql

Add the implementation for downloading mnist

Author: moazreyad

examples/singa_peft/examples/data/download_mnist.py

@@ -0,0 +1,59 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+
+import argparse
+import os
+import urllib.request
+
+
+def check_exist_or_download(url, download_dir):
+    download_dir = os.path.abspath(download_dir)
+    os.makedirs(download_dir, exist_ok=True)
+
+    name = url.rsplit('/', 1)[-1]
+    filename = os.path.join(download_dir, name)
+
+    if not os.path.isfile(filename):
+        print("Downloading %s -> %s" % (url, filename))
+        urllib.request.urlretrieve(url, filename)
+    else:
+        print("Already Downloaded: %s -> %s" % (url, filename))
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description='Download the MNIST dataset.'
+    )
+    parser.add_argument(
+        '-dir',
+        '--dir-path',
+        dest='dir_path',
+        default='/tmp/mnist',
+        help='Directory to save the MNIST dataset.'
+    )
+    args = parser.parse_args()
+
+    train_x_url = 'https://github.com/fgnt/mnist/raw/master/train-images-idx3-ubyte.gz'
+    train_y_url = 'https://github.com/fgnt/mnist/raw/master/train-labels-idx1-ubyte.gz'
+    valid_x_url = 'https://github.com/fgnt/mnist/raw/master/t10k-images-idx3-ubyte.gz'
+    valid_y_url = 'https://github.com/fgnt/mnist/raw/master/t10k-labels-idx1-ubyte.gz'
+
+    check_exist_or_download(train_x_url, args.dir_path)
+    check_exist_or_download(train_y_url, args.dir_path)
+    check_exist_or_download(valid_x_url, args.dir_path)
+    check_exist_or_download(valid_y_url, args.dir_path)