Initialize a SemanticRolesResultSubject object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a SemanticRolesResultSubject object from a json dictionary."""
        args = {}
        if 'text' in _dict:
            args['text'] = _dict.get('text')
        if 'entities' in _dict:
            args['entities'] = [
                SemanticRolesEntity._from_dict(x)
                for x in (_dict.get('entities'))
            ]
        if 'keywords' in _dict:
            args['keywords'] = [
                SemanticRolesKeyword._from_dict(x)
                for x in (_dict.get('keywords'))
            ]
        return cls(**args)