Score The Fraction Of Sentences In The Answer That Are Directly Supported By The Retrieved Documents

An educational evaluation metric inspired by RAGAS Context Recall, measuring the proportion of an AI's answer sentences that are fully grounded in the provided retrieved documents.

As an expert educational evaluator, your task is to score the fraction of sentences in the student's answer that are directly supported by the retrieved documents. Inspired by the RAGAS Context Recall metric, this assessment ensures the reliability and groundedness of educational AI. Please review the `[student_answer]` and the `[retrieved_documents]`. Identify the sentences in the answer that are fully grounded in the provided documents. Calculate the `[supported_fraction]` by dividing the number of supported sentences by the total number of sentences in the answer. Finally, output the calculated supported fraction to complete the evaluation.