tensorflow笔记：MNIST数据集无法下载的解决

在tensorflow教程中，运行下面的代码下载mnist数据集：

#coding:utf-8
from tensorflow.examples.tutorials.mnist import input_data
mnist=input_data.read_data_sets('/home/zhangkf/tf/tf5/mnist',one_hot=True)

但实际运行时根本无法通过网络下载，网上可以查到一些解决方法，但说得不是很清楚，这里整理一下，大小神请无视。

解决方案就是手工下载数据，然后直接导入使用。

(tf13) zhangkf@Ubuntu2:~/tf/tf5$ python mnist.py 
Traceback (most recent call last):
  File "mnist.py", line 4, in 
    mnist=input_data.read_data_sets('/home/zhangkf/tf/tf5/mnist',one_hot=True)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/datasets/mnist.py", line 235, in read_data_sets
    SOURCE_URL + TRAIN_IMAGES)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/datasets/base.py", line 208, in maybe_download
    temp_file_name, _ = urlretrieve_with_retry(source_url)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/datasets/base.py", line 165, in wrapped_fn
    return fn(*args, **kwargs)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/datasets/base.py", line 190, in urlretrieve_with_retry
    return urllib.request.urlretrieve(url, filename)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/urllib.py", line 98, in urlretrieve
    return opener.retrieve(url, filename, reporthook, data)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/urllib.py", line 245, in retrieve
    fp = self.open(url, data)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/urllib.py", line 213, in open
    return getattr(self, name)(url)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/urllib.py", line 443, in open_https
    h.endheaders(data)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/httplib.py", line 1038, in endheaders
    self._send_output(message_body)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/httplib.py", line 882, in _send_output
    self.send(msg)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/httplib.py", line 844, in send
    self.connect()
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/httplib.py", line 1263, in connect
    server_hostname=server_hostname)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/ssl.py", line 363, in wrap_socket
    _context=self)
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/ssl.py", line 611, in __init__
    self.do_handshake()
  File "/home/zhangkf/.conda/envs/tf13/lib/python2.7/ssl.py", line 840, in do_handshake
    self._sslobj.do_handshake()
IOError: [Errno socket error] EOF occurred in violation of protocol (_ssl.c:661)

一、手工下载地址： http://yann.lecun.com/exdb/mnist/

4个文件，注意下载后不需要解压，不需要解压，不需要解压。

二、导入数据

如果把上述下载的文件放在与运行的.py文件同一个目录下，那么就这样：

#coding:utf-8
from tensorflow.examples.tutorials.mnist import input_data
mnist=input_data.read_data_sets('./',one_hot=True)

运行成功显示如下，算是解决了上述的问题。

(tf13) zhangkf@Ubuntu2:~/tf/tf5$ python mnist.py 
Extracting ./train-images-idx3-ubyte.gz
Extracting ./train-labels-idx1-ubyte.gz
Extracting ./t10k-images-idx3-ubyte.gz
Extracting ./t10k-labels-idx1-ubyte.gz