Use local LLMs about ragas HOT 8 CLOSED

`ValidationError                           Traceback (most recent call last)
Cell In[39], line 6
      4 import torch
      5 from langchain.llms import HuggingFacePipeline
----> 6 from ragas.metrics import Faithfulness
      9 DATASET_PATH = "explodinggradients/ragas-wikiqa"
     10 MODEL_PATH = "llama-2-7b-chat-hf"

File ~/.local/lib/python3.8/site-packages/ragas/__init__.py:1
----> 1 from ragas.evaluation import evaluate
      3 try:
      4     from ._version import version as __version__

File ~/.local/lib/python3.8/site-packages/ragas/evaluation.py:9
      6 from datasets import Dataset, concatenate_datasets
      8 from ragas._analytics import EvaluationEvent, track
----> 9 from ragas.metrics.base import Metric
     10 from ragas.metrics.critique import AspectCritique
     11 from ragas.validation import validate_column_dtypes, validate_evaluation_modes

File ~/.local/lib/python3.8/site-packages/ragas/metrics/__init__.py:2
      1 from ragas.metrics.answer_relevance import AnswerRelevancy, answer_relevancy
----> 2 from ragas.metrics.context_relevance import ContextRelevancy, context_relevancy
      3 from ragas.metrics.critique import AspectCritique
      4 from ragas.metrics.faithfulnes import Faithfulness, faithfulness

File ~/.local/lib/python3.8/site-packages/ragas/metrics/context_relevance.py:173
    168             scores.append(agr_score * np.mean(overlap_scores))
    170         return dataset.add_column(f"{self.name}", scores)  # type: ignore
--> 173 context_relevancy = ContextRelevancy()

File <string>:4, in __init__(self, batch_size, llm, name, evaluation_mode, strictness, agreement_metric, model_name)

File ~/.local/lib/python3.8/site-packages/ragas/metrics/base.py:69, in _llm_factory()
     68 def _llm_factory():
---> 69     return ChatOpenAI(model_name="gpt-3.5-turbo-16k")

File ~/.local/lib/python3.8/site-packages/langchain/load/serializable.py:74, in Serializable.__init__(self, **kwargs)
     73 def __init__(self, **kwargs: Any) -> None:
---> 74     super().__init__(**kwargs)
     75     self._lc_kwargs = kwargs

File ~/.local/lib/python3.8/site-packages/pydantic/main.py:341, in pydantic.main.BaseModel.__init__()

ValidationError: 1 validation error for ChatOpenAI
__root__
  Did not find openai_api_key, please add an environment variable `OPENAI_API_KEY` which contains it, or pass  `openai_api_key` as a named parameter. (type=value_error)`