Initialize a QueryRelationsRelationship object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a QueryRelationsRelationship object from a json dictionary."""
        args = {}
        if 'type' in _dict:
            args['type'] = _dict.get('type')
        if 'frequency' in _dict:
            args['frequency'] = _dict.get('frequency')
        if 'arguments' in _dict:
            args['arguments'] = [
                QueryRelationsArgument._from_dict(x)
                for x in (_dict.get('arguments'))
            ]
        if 'evidence' in _dict:
            args['evidence'] = [
                QueryEvidence._from_dict(x) for x in (_dict.get('evidence'))
            ]
        return cls(**args)