# FeedbackFormulaWeightedVariable

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/schemas/FeedbackFormulaWeightedVariable)

A feedback key and weight used when calculating feedback formulas.

.. admonition:: Deprecated

    Composite feedback formulas are no longer supported in the SDK.
    Add composite feedback scores via the LangSmith UI instead. This
    schema is retained only for backwards compatibility and will be
    removed in a future release.

## Signature

```python
FeedbackFormulaWeightedVariable()
```

## Extends

- `BaseModel`

## Properties

- `part_type`
- `weight`
- `key`

---

[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/52e79add98f6559235d1eb00f5f533b9be6d4cf6/python/langsmith/schemas.py#L1686)