parameters: (f)
docstring: Extract the images into a 4D uint8 numpy array [index, y, x, depth].
  
    Args:
      f: A file object that can be passed into a gzip reader.
  
    Returns:
      data: A 4D unit8 numpy array [index, y, x, depth].
  
    Raises:
      ValueError: If the bytestream does not start with 2051.
docstring_summary: Extract the images into a 4D uint8 numpy array [index, y, x, depth].
docstring_tokens: Extract the images into a 4D uint8 numpy array [ index y x depth ] .
function: def extract_images(f):
    """Extract the images into a 4D uint8 numpy array [index, y, x, depth].
  
    Args:
      f: A file object that can be passed into a gzip reader.
  
    Returns:
      data: A 4D unit8 numpy array [index, y, x, depth].
  
    Raises:
      ValueError: If the bytestream does not start with 2051.
  
    """
    print('Extracting', f.name)
    with gzip.GzipFile(fileobj=f) as bytestream:
      magic = _read32(bytestream)
      if magic != 2051:
        raise ValueError('Invalid magic number %d in MNIST image file: %s' %
                         (magic, f.name))
      num_images = _read32(bytestream)
      rows = _read32(bytestream)
      cols = _read32(bytestream)
      buf = bytestream.read(rows * cols * num_images)
      data = numpy.frombuffer(buf, dtype=numpy.uint8)
      data = data.reshape(num_images, rows, cols, 1)
      return data
function_tokens: def extract_images ( f ) : print ( 'Extracting' , f . name ) with gzip . GzipFile ( fileobj = f ) as bytestream : magic = _read32 ( bytestream ) if magic != 2051 : raise ValueError ( 'Invalid magic number %d in MNIST image file: %s' % ( magic , f . name ) ) num_images = _read32 ( bytestream ) rows = _read32 ( bytestream ) cols = _read32 ( bytestream ) buf = bytestream . read ( rows * cols * num_images ) data = numpy . frombuffer ( buf , dtype = numpy . uint8 ) data = data . reshape ( num_images , rows , cols , 1 ) return data