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修复 docs/guide/chapter4.md 中 RunnableMap 示例的 target_audience 传递逻辑#85

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修复 docs/guide/chapter4.md 中 RunnableMap 示例的 target_audience 传递逻辑#85
Scent-z wants to merge 1 commit into
datawhalechina:mainfrom
Scent-z:refactor/runnable-chain

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@Scent-z

@Scent-z Scent-z commented Jun 25, 2026

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原示例中使用 RunnablePassthrough(),会将完整输入字典传递给 target_audience,
而营销话术生成阶段只需要 target_audience 字段本身。

本次修改将其调整为 lambda x: x["target_audience"],
使 RunnableMap 输出结构更符合后续 PromptTemplate 的输入预期。

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