docs: def load_transforms(transforms):
      """
      Load transform modules and return instance of transform class.
  
      Parameters
      ----------
      transforms : [str] or [[str]]
          array of transform module name,
          or nested array of transform module name with argv to load
  
      Returns
      -------
          array of transform instance
      """
  
      from . import Transform
      import inspect
  
      # normalize arguments to form as [(name, [option, ...]), ...]
      transforms_with_argv = map(lambda t: (t[0], t[1:]) if isinstance(t, list) else (t, []),
                                 transforms)
  
      def instantiate_transform(module_name, argv):
          tr_module = __import__(
              module_name if module_name.count('.') > 0 else TRANSFORM_MODULE_PREFIX + module_name,
              fromlist=['dummy'])
          tr_classes = inspect.getmembers(
              tr_module,
              lambda c: issubclass(c if inspect.isclass(c) else None.__class__,
                                   Transform))
  
          if len(tr_classes) != 1:
              raise TypeError('Transform module must have only one subclass of Transform')
  
          tr_class = tr_classes[0]
          return tr_class[1](argv)
  
      return [instantiate_transform(tr[0], tr[1])
              for tr in transforms_with_argv]