# tinker_cookbook.supervised.ChatDatasetBuilder

## *class* [**tinker_cookbook.supervised.ChatDatasetBuilder**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/supervised/types.py#L100)(*[SupervisedDatasetBuilder](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/supervised/superviseddatasetbuilder/index.md)*)

Build a chat dataset that uses a renderer to tokenise message lists.

Subclasses must implement `__call__` to return the concrete datasets.

**Fields:**

- [**common_config**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/supervised/types.py#L110) (*[ChatDatasetBuilderCommonConfig](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/supervised/chatdatasetbuildercommonconfig/index.md)*)

### [**__call__**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/supervised/types.py#L112)()

Build and return (train_dataset, eval_dataset).

**Returns:** *tuple\[[SupervisedDataset](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/supervised/superviseddataset/index.md), [SupervisedDataset](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/supervised/superviseddataset/index.md) | None\]* – Training dataset and an optional evaluation dataset.

### *property* [**tokenizer**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/supervised/types.py#L122)

Get the tokenizer for this dataset's model.

**Returns:** *Tokenizer*

### *property* [**renderer**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/supervised/types.py#L127)

Get the renderer for this dataset's model.

**Returns:** *renderers.[Renderer](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/renderers/renderer/index.md)*

## Referenced by

- [tinker_cookbook.preference.Config](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/preference/config/index.md)
- [tinker_cookbook.supervised.FromConversationFileBuilder](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/supervised/fromconversationfilebuilder/index.md)