--- Output ---
{
 'signature': StringSignature(sentence -> sentiment
     instructions='Given the fields `sentence`, produce the fields `sentiment`.'
     sentence = Field(annotation=str required=True json_schema_extra={'__dspy_field_type': 'input', 'prefix': 'Sentence:', 'desc': '${sentence}'})
     sentiment = Field(annotation=str required=True json_schema_extra={'__dspy_field_type': 'output', 'prefix': 'Sentiment:', 'desc': '${sentiment}'})
 ),
 'some_other_attributes': 'xxx'}