langchain/client/langchain.py/LangChainPlusClient/create_dataset
class LangChainPlusClient:    def create_dataset(self, dataset_name: str, description: str) -> Dataset:
        """Create a dataset in the LangChain+ API."""
        dataset = DatasetCreate(
            tenant_id=self.tenant_id,
            name=dataset_name,
            description=description,
        )
        response = requests.post(
            self.api_url + "/datasets",
            headers=self._headers,
            data=dataset.json(),
        )
        raise_for_status_with_text(response)
        return Dataset(**response.json())