# LLMStringRunMapper

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper)

Extract items to evaluate from the run object.

## Signature

```python
LLMStringRunMapper()
```

## Extends

- `StringRunMapper`

## Methods

- [`serialize_chat_messages()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper/serialize_chat_messages)
- [`serialize_inputs()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper/serialize_inputs)
- [`serialize_outputs()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper/serialize_outputs)
- [`map()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper/map)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/b302691ff9ad841804e93e5addbdc53b6974473b/libs/langchain/langchain_classic/smith/evaluation/string_run_evaluator.py#L58)