Repository: explodinggradients/ragas
Issue: [ERROR] Prompt xxx failed to  parse output:The output parser failed to parse the output including retries.
Root cause: Validation Gap

[ ] I have checked the [documentation](https://docs.ragas.io/) and related resources and couldn't resolve my bug.

**Describe the bug**
I have the same problem. When the length of reference and response is very long (response 665 characters, reference 2745 characters), llm_context_precision_with_reference,context_recall and fectual_correctness are all nan, and then the error message is: [ERROR] Prompt xxx failed to parse output: The output parser failed to parse the output including retries.

Ragas version:
Python version:3.11.0

**Code to Reproduce**

  def count_score(self, result) -> dict:
        scores = asdict(result).get("scores", [])
        print(f'result==分数计算算==>{result}')
        if not scores:
            return {}  # 如果 "scores" 列表为空，直接返回空字典
        score = {}
        for case in scores:
            for metrics, value in case.items():
                if math.isnan(value):
                    value = 0  # 将 nan 替换为 0
                if metrics not in score:
                    score[metrics] = value
                else:
                    score[metrics] += value
        mean_score = {metrics: round(value / len(scores),2) for metrics, value in score.items()}
        return mean_score
    
    async def evaluation(self) -> Data:
        result = Data(text="")
        if not self.user_input or not self.response or not self.retrieved_contexts:
            self.status = result
            return None
        if not self.referenceContent:
            if self.ContextPrecision: result.data["ContextPrecision"]= "Disabled(reference required)"
            if self.ContextRecall: result.data["ContextRecall"]= " Disabled(reference required)"
            if self.FactualCorrectness: result.data["FactualCorrectness"] = "Disabled(reference required)"
            if self.SemanticSimilarity: result.data["SemanticSimilarity"]= "Disabled(reference required)"
            # self.ContextPrecision = self.ContextRecall = self.FactualCorrectness = self.SemanticSimilarity = False
            # self.reference = ""
        
        _retrive_contexts = []
        for context in self.retrieved_contexts:
            _retrive_contexts.append(context.data["Generate"])
        print(f'{"-"*100}\nretrieved_contexts+++>{_retrive_contexts}\n{"-"*100}')
        
        _referenceContent = self.referenceContent
        
        sample = [SingleTurnSample(
            user_input = self.user_input,
            response = self.response,
            retrieved_contexts = _retrive_contexts,
            reference=_referenceContent,
            reference_contexts =[ _referenceContent ]
        )]
        print(f'{"-"*30}  self.referenceContent==>{type(self.referenceContent)}= self.referenceContent===>{self.referenceContent} \nsample ==>{sample}\n{"-"*30}')

        default_url = "http://0.0.0.0:11435"
        # llm = self.model
        llm = ChatOllama(model="qwen2.5:14b-instruct-fp16", temperature=0,  base_url=default_url) 
        # evaluator_llm = LlamaIndexLLMWrapper(llm)
        evaluator_llm = LangchainLLMWrapper(llm)
        evaluator_embeddings = LangchainEmbeddingsWrapper(self.embedding)
        eval_dataset = EvaluationDataset(sample)
        
        metrics = []
        if self.ContextPrecision: metrics.append(LLMContextPrecisionWithReference(llm=evaluator_llm))
        if self.ContextRecall: metrics.append(LLMContextRecall(llm=evaluator_llm))
        if self.FactualCorrectness: metrics.append(FactualCorrectness(llm=evaluator_llm))
        if self.Faithfulness :metrics.append(Faithfulness(llm=evaluator_llm))
        if self.ResponseRelevancy: metrics.append(ResponseRelevancy(llm=evaluator_llm, embeddings=evaluator_embeddings))
        if self.SemanticSimilarity: metrics.append(SemanticSimilarity(embeddings=evaluator_embeddings))

        evaluation_result = evaluate(dataset=eval_dataset, metrics=metrics  , run_config=RunConfig(max_workers=4,timeout=3200000))
        score = self.count_score(evaluation_result)
        
        # context_precision = LLMContextPrecisionWithReference(llm=evaluator_llm)
        # sample2 = SingleTurnSample(
        #     user_input = self.user_input,
        #     retrieved_contexts = _retrive_contexts,
        #     reference = self.referenceContent
        # )
        # print(f'sample2222=>{sample2}')
        # resss =  await context_precision.single_turn_ascore(sample2)
        # print(f'test LLMContextPrecisionWithReference测试===>{resss}')
        # for metrics, value in score.items():
        #     result += f"{metrics}: {value}\n"
        result_docs = self.retrieved_contexts if  isinstance(self.retrieved_contexts,list) else [self.retrieved_contexts]
        print(f'score==>P{score},===>{result_docs}')
        source = []
        content = []
        for item in result_docs:
            if item.data["source"]:
                source.append(item.data["source"])
            if item.text:
                content.append(item.text)
        resultData = Data(data=dict(score,question=self.user_input, answer = self.response,sources = '\n'.join(source),retrieval_content='\n----------------------------分割线------------------------\n'.join(content) ))
        self.status =  resultData
        return resultData



**Error trace**
[ERROR] Prompt xxx failed to  parse output:The output parser failed to parse the output including retries.

**Expected behavior**
I hope these three values ​​llm_context_precision_with_reference,context_recall and fectual_correctness can be calculated

**Additional context**
Add any other context about the problem here.

<!-- PS: bugs suck but is also part of the process. We sincerely apologies for breaking your flow because of it, but don't worry, we got your back ❤️. We will get this fixed as fast as we can and thanks for helping us out by reporting it 🙏. -->


<!-- Answer -->
The issue you're encountering with NaN values for `llm_context_precision_with_reference`, `context_recall`, and `factual_correctness` metrics, especially with long reference and response lengths, might be related to the limitations of the evaluation framework or the specific configuration of the language model and embeddings.

Here are a few suggestions to address the problem:

1. **Upgrade Ragas Version**: Ensure you are using Ragas version 0.2.9 or later, as this version addresses issues related to NaN values in metrics by providing better handling for undetermined states <sup>[[1]](https://github.com/explodinggradients/ragas/issues/1784)</sup>.

2. **Batch Processing**: Consider splitting your dataset into smaller batches and evaluating them independently. This can help manage memory usage and processing time, which might be contributing to the NaN values.

3. **Check LLM and Embeddings Configuration**: Ensure that the `LangchainLLMWrapper` and `LangchainEmbeddingsWrapper` are correctly configured and compatible with the metrics you are using. These wrappers are crucial for providing the necessary LLM and embeddings for evaluation <sup>[[2]](https://github.com/explodinggradients/ragas/blob/main/src/ragas/evaluation.py)</sup><sup>[[3]](https://github.com/explodinggradients/ragas/blob/main/src/ragas/integrations/langchain.py)</sup>.

4. **Handle NaN Values**: In your `count_score` function, you are already replacing NaN values with 0. This is a good practice to ensure that your scoring logic can proceed without errors. However, it's important to understand why NaN values are occurring to address the root cause.

5. **Review Metric Requirements**: Ensure that all required inputs for the metrics are provided. For example, some metrics might require specific reference content or context to function correctly.

By following these steps, you should be able to mitigate the issue and obtain meaningful evaluation results. If the problem persists, consider reviewing the specific configurations and inputs used in your evaluation setup.


<!-- Dosu Comment Footer -->
*To continue talking to [Dosu](https://dosu.dev), mention @dosu.*

---
<sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/94d6c2ed-c158-4843-a043-8a7db4fd18ce?feedback_type=other)</sup>