Repository: explodinggradients/ragas
Issue: Generate a Synthetic Test Set In Other Language
Root cause: Unimplemented Feature Gap

 I checked the [documentation](https://docs.ragas.io/) and related resources and couldn't find an answer to my question.

**Your Question**
what is unclear to you? What would you like to know?
when I use the function generate_with_langchain_docs to generate a test, the columns of  question ,ground_truth is generated in ENGLISH, how could I set them in other language?

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<!-- Answer -->
To generate the "question" and "ground_truth" columns in a different language using the `generate_with_langchain_docs` function, you need to adapt the language settings of the `generator_llm` and `critic_llm` used in the `TestsetGenerator`. Here's how you can modify the function to include a language parameter:

```python
def generate_with_langchain_docs(
    self,
    documents: t.Sequence[LCDocument],
    test_size: int,
    distributions: t.Optional[Distributions] = None,
    with_debugging_logs=False,
    is_async: bool = True,
    raise_exceptions: bool = True,
    run_config: t.Optional[RunConfig] = None,
    language: str = "en"  # Add a language parameter with a default value
):
    distributions = distributions or {}
    # chunk documents and add to docstore
    self.docstore.add_documents(
        [Document.from_langchain_document(doc) for doc in documents]
    )

    # Adapt the language for the generator and critic LLMs
    self.generator_llm.adapt(language)
    self.critic_llm.adapt(language)

    return self.generate(
        test_size=test_size,
        distributions=distributions,
        with_debugging_logs=with_debugging_logs,
        is_async=is_async,
        raise_exceptions=raise_exceptions,
        run_config=run_config,
    )
```

In this modification, the `language` parameter is added to the `generate_with_langchain_docs` function. The `adapt` method is called on both `generator_llm` and `critic_llm` to set the desired language before generating the test set. This ensures that the "question" and "ground_truth" columns are generated in the specified language <sup>[[1]](https://github.com/explodinggradients/ragas/blob/main/src/ragas/testset/generator.py)</sup>.


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Hey @AprilJoy We understand this is important, but the current version of test generation itself has many other limitations which is why we are working on #1016 . An initial version of this will be merged by early next week and then we will collect and work on issues like this which need attention. 

keeping a tab on #1016 

I suppose there is not really an update on this one? I followed the tutorial https://docs.ragas.io/en/stable/howtos/customizations/testgenerator/_language_adaptation/ with the only change that I'm using German data instead of Spanish. However, most of the questions and answers generated are in English