code: def _make_info(shape_list, num_classes):
    
    feature_info = collections.namedtuple("FeatureInfo", ["shape", "num_classes"])
    cur_shape = list(shape_list[0])
    # We need to merge the provided shapes, put None where they disagree.
    for shape in shape_list:
      if len(shape) != len(cur_shape):
        raise ValueError("Shapes need to have the same number of dimensions.")
      for i in range(len(shape)):
        if cur_shape[i] is not None:
          if shape[i] != cur_shape[i]:
            cur_shape[i] = None
    return feature_info(cur_shape, num_classes)
docs: Create an info-like tuple for feature given some shapes and vocab size.