code: def read_devkit(f):
      
      with tar_open(f) as tar:
          # Metadata table containing class hierarchy, textual descriptions, etc.
          meta_mat = tar.extractfile(DEVKIT_META_PATH)
          synsets, cost_matrix = read_metadata_mat_file(meta_mat)
  
          # Raw validation data groundtruth, ILSVRC2010 IDs. Confusingly
          # distributed inside the development kit archive.
          raw_valid_groundtruth = numpy.loadtxt(tar.extractfile(
              DEVKIT_VALID_GROUNDTRUTH_PATH), dtype=numpy.int16)
      return synsets, cost_matrix, raw_valid_groundtruth
docs: Read relevant information from the development kit archive.
  
      Parameters
      ----------
      f : str or file-like object
          The filename or file-handle for the gzipped TAR archive
          containing the ILSVRC2010 development kit.
  
      Returns
      -------
      synsets : ndarray, 1-dimensional, compound dtype
          See :func:`read_metadata_mat_file` for details.
      cost_matrix : ndarray, 2-dimensional, uint8
          See :func:`read_metadata_mat_file` for details.
      raw_valid_groundtruth : ndarray, 1-dimensional, int16
          The labels for the ILSVRC2010 validation set,
          distributed with the development kit code.