Downloads the image that corresponds to the given row.
  Prints a notification if the download fails.

def get_image(row, output_dir):
  """Downloads the image that corresponds to the given row.
  Prints a notification if the download fails."""
  if not download_image(image_id=row[0],
                        url=row[1],
                        x1=float(row[2]),
                        y1=float(row[3]),
                        x2=float(row[4]),
                        y2=float(row[5]),
                        output_dir=output_dir):
    print("Download failed: " + str(row[0]))