LangChain 中强制让模型结构化输出

By | 11 1 月, 2025
88 Comments

可以通过 langchain 中的 StructuredOutputParser/ResponseSchema 来在 prompt_template 中添加对应的结构化输出 Prompt 引导说明，来强制模型按要求输出。

示例代码：

from langchain.prompts import PromptTemplate
from langchain.output_parsers import StructuredOutputParser, ResponseSchema

prompt_template = """您是一位专业的鲜花店文案撰写员。\n
对于售价为 {price} 元的 {flower_name}，您能提供一个吸引人的简短描述吗？

{format_instructions}
"""
response_schemas = [
    ResponseSchema(name="description", description="鲜花的描述文案"),
    ResponseSchema(name="reason", description="问为什么要这样写这个文案"),
]
output_parser = StructuredOutputParser.from_response_schemas(response_schemas)
format_instructions = output_parser.get_format_instructions()
prompt = PromptTemplate.from_template(
    prompt_template,
    partial_variables={"format_instructions": format_instructions},
)
input = prompt.format(flower_name="玫瑰", price="50")
output = model.invoke(input)
print("原始输出: \n{output}\n".format(output=output.content))
parsed_output = output_parser.parse(output.content)
print("结构化输出：\n{output}\n".format(output=json.dumps(parsed_output, ensure_ascii=False, indent=4)))

运行结果：

原始输出: 
```json
{
    "description": "这束由绚丽玫瑰组成的花束，每一朵花瓣都承载着浓烈而纯粹的爱意，适合表达最真挚的情感。",
    "reason": "该文案强调玫瑰花寓意的爱情，突出其情感价值，以吸引想表达爱意的顾客。"
}
```

结构化输出：
{
    "description": "这束由绚丽玫瑰组成的花束，每一朵花瓣都承载着浓烈而纯粹的爱意，适合表达最真挚的情感。",
    "reason": "该文案强调玫瑰花寓意的爱情，突出其情感价值，以吸引想表达爱意的顾客。"
}

88 thoughts on “LangChain 中强制让模型结构化输出”

  1. Pingback: MyBlog

  2. Pingback: get androxal generic form

  3. Pingback: buy cheap enclomiphene generic health

  4. Pingback: cheap rifaximin how to purchase viagra

  5. Pingback: how to order xifaxan australia over the counter

  6. Pingback: ordering staxyn cost per tablet

  7. Pingback: buying avodart generic overnight delivery

  8. Pingback: how to order dutasteride usa discount

  9. Pingback: buy cheap flexeril cyclobenzaprine generic india

  10. Pingback: how to order gabapentin purchase online uk

  11. Pingback: comprar kamagra pela internet

  12. Pingback: medicament kamagra tablette pharmacie

  13. Pingback: cheap fildena us overnight delivery

  14. Pingback: discount itraconazole uk where buy

  44. Fran

    how to hack australian pokies, what is a blackjack dealer
    called (Fran) there a casino in sydney united states
    and safest online casino in australia, or usa $200 no deposit bonus 200 free spins

    Reply ↓
  46. Shayne

    top bingo site uk, gambling stocks in united states and real money poker
    united states app, or top usa online poker sites

    Also visit my web-site :: hoyle casino games for mac (Shayne)

    Reply ↓
  48. Augustus

    usa casino queen (Augustus) providers, casino toronto canada and
    same-day withdrawal online casinos united states, or big poker tournaments in australia

    Reply ↓
  49. Miquel

    no wager united statesn grand casino tycoon cheats (Miquel), usa blackjack online free and play free
    usa bingo, or usa real money slots no deposit bonus

    Reply ↓
  50. Avis

    online casino games australia free, uk no deposit casino and best sign up bonus does the queen mary 2 have a casino (Avis) united kingdom, or canadian casino
    guide 2021 review

    Reply ↓
  51. Wilmer

    free australian pokies wheres the gold, poker site usa and jackpot pokies canada, or new zealandn online gambling
    pokies

    Feel free to surf to my website – epiphone casino john lennon edition (Wilmer)

    Reply ↓

回复 wettbüro nüRnberg 取消回复

您的邮箱地址不会被公开。 必填项已用 * 标注