# SummarizerMixin

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin)

Mixin for summarizer.

## Signature

```python
SummarizerMixin()
```

## Extends

- `BaseModel`

## Properties

- `human_prefix`
- `ai_prefix`
- `llm`
- `prompt`
- `summary_message_cls`

## Methods

- [`predict_new_summary()`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/predict_new_summary)
- [`apredict_new_summary()`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/apredict_new_summary)

## ⚠️ Deprecated

Deprecated since version 0.2.12.

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/b302691ff9ad841804e93e5addbdc53b6974473b/libs/langchain/langchain_classic/memory/summary.py#L19)