docs: def _from_dict(cls, _dict):
          """Initialize a ClassificationCollection object from a json dictionary."""
          args = {}
          if 'classifier_id' in _dict:
              args['classifier_id'] = _dict.get('classifier_id')
          if 'url' in _dict:
              args['url'] = _dict.get('url')
          if 'collection' in _dict:
              args['collection'] = [
                  CollectionItem._from_dict(x) for x in (_dict.get('collection'))
              ]
          return cls(**args)