old_contents: import hashlib
  import os
  import shutil
  import urllib2
  
  __all__ = ['DATA_HOME', 'download']
  
  DATA_HOME = os.path.expanduser('~/.cache/paddle_data_set')
  
  if not os.path.exists(DATA_HOME):
      os.makedirs(DATA_HOME)
  
  
  def download(url, md5):
      filename = os.path.split(url)[-1]
      assert DATA_HOME is not None
      filepath = os.path.join(DATA_HOME, md5)
      if not os.path.exists(filepath):
          os.makedirs(filepath)
      __full_file__ = os.path.join(filepath, filename)
  
      def __file_ok__():
          if not os.path.exists(__full_file__):
              return False
          md5_hash = hashlib.md5()
          with open(__full_file__, 'rb') as f:
              for chunk in iter(lambda: f.read(4096), b""):
                  md5_hash.update(chunk)
  
          return md5_hash.hexdigest() == md5
  
      while not __file_ok__():
          response = urllib2.urlopen(url)
          with open(__full_file__, mode='wb') as of:
              shutil.copyfileobj(fsrc=response, fdst=of)
      return __full_file__
  
new_contents: import hashlib
  import os
  import shutil
  import urllib2
  
  __all__ = ['DATA_HOME', 'download']
  
  DATA_HOME = os.path.expanduser('~/.cache/paddle/dataset')
  
  if not os.path.exists(DATA_HOME):
      os.makedirs(DATA_HOME)
  
  
  def download(url, md5):
      filename = os.path.split(url)[-1]
      assert DATA_HOME is not None
      filepath = os.path.join(DATA_HOME, md5)
      if not os.path.exists(filepath):
          os.makedirs(filepath)
      __full_file__ = os.path.join(filepath, filename)
  
      def __file_ok__():
          if not os.path.exists(__full_file__):
              return False
          md5_hash = hashlib.md5()
          with open(__full_file__, 'rb') as f:
              for chunk in iter(lambda: f.read(4096), b""):
                  md5_hash.update(chunk)
  
          return md5_hash.hexdigest() == md5
  
      while not __file_ok__():
          response = urllib2.urlopen(url)
          with open(__full_file__, mode='wb') as of:
              shutil.copyfileobj(fsrc=response, fdst=of)
      return __full_file__
  
subject: Set data cache home directory to ~/.cache/paddle/dataset