LangChain integration does not work for summarization_score

[Peilun-Li]

• I have checked the documentation and related resources and couldn't resolve my bug.

Describe the bug
EvaluatorChain errors out for summariztion_score metric. ValueError: Missing some input keys: {'answer'}

Ragas version: 0.1.15
Python version: 3.9

Code to Reproduce

from ragas.integrations.langchain import EvaluatorChain
from ragas.metrics import summarization_score 

chain=EvaluatorChain(metric=summarization_score)

chain.run({"contexts": ["hello"], "summary": "hello"})

Error trace

File /.../python3.9/site-packages/langchain/chains/base.py:284, in Chain._validate_inputs(self, inputs)
    282 missing_keys = set(self.input_keys).difference(inputs)
    283 if missing_keys:
--> 284     raise ValueError(f"Missing some input keys: {missing_keys}")
ValueError: Missing some input keys: {'answer'}

Expected behavior
Expect summarization_score could work with LangChain (EvaluatorChain)

Additional context
The same setting above works for other ragas metrics like faithfulness. Example

from ragas.integrations.langchain import EvaluatorChain
from ragas.metrics import faithfulness 

chain=EvaluatorChain(metric=faithfulness)

chain.run({"question": "What is the capital of France?",
    "answer": "The capital of France is Paris.",
    "contexts": [
        "France, in Western Europe, encompasses medieval cities, alpine villages and Mediterranean beaches. Paris, its capital, is famed for its fashion houses, classical art museums including the Louvre and monuments like the Eiffel Tower.",
        "Paris is the capital and most populous city of France. It has an area of 105 square kilometers and a population of over 2 million residents."
    ],
    "ground_truth": "Paris"
})

[dosubot]

@Peilun-Li Hello there! I'm here to help you with bugs, questions, and becoming a contributor.

Could you provide the exact definition of the summarization_score metric? Specifically, what input keys does it require? This will help determine if there are any missing keys that need to be included in the chain.run method.

To continue talking to Dosu, mention @dosu.

[anistark]

Please try with latest ragas 0.3.9 use from ragas.metrics.collections import SummaryScore
We're not supporting 0.1.15 anymore.