docs: def _from_dict(cls, _dict):
          """Initialize a TrainingQuery object from a json dictionary."""
          args = {}
          if 'query_id' in _dict:
              args['query_id'] = _dict.get('query_id')
          if 'natural_language_query' in _dict:
              args['natural_language_query'] = _dict.get('natural_language_query')
          if 'filter' in _dict:
              args['filter'] = _dict.get('filter')
          if 'examples' in _dict:
              args['examples'] = [
                  TrainingExample._from_dict(x) for x in (_dict.get('examples'))
              ]
          return cls(**args)