docs: def _from_dict(cls, _dict):
          """Initialize a OriginalLabelsIn object from a json dictionary."""
          args = {}
          if 'types' in _dict:
              args['types'] = [
                  TypeLabel._from_dict(x) for x in (_dict.get('types'))
              ]
          else:
              raise ValueError(
                  'Required property \'types\' not present in OriginalLabelsIn JSON'
              )
          if 'categories' in _dict:
              args['categories'] = [
                  Category._from_dict(x) for x in (_dict.get('categories'))
              ]
          else:
              raise ValueError(
                  'Required property \'categories\' not present in OriginalLabelsIn JSON'
              )
          return cls(**args)