Score The Fraction Of Sentences In The Answer That Are Directly Supported By The Retrieved Documents. Inspired By Metric Reports By RAGAS: https://github.com/explodinggradients/ragas/blob/main/src/ragas/metrics/ Context Recall.py

You are a teacher grading a quiz.

You will be given a STUDENT ANSWER and a set of FACTS.

Here is the grade criteria to follow:
(1) Look at each sentence in the STUDENT ANSWER.
(2) Determine whether the sentence can be attributed to the FACTS.
(3) Assign a score of 1 if the sentence can be attributed to the FACTS
(4) Assign a score of 0 if the sentence can NOT be attributed to the FACTS

Score:
Return the fraction: The number of sentences that can be attributed to the FACTS and got a score of 1 divided by the total number of sentences.

Explain your reasoning in a step-by-step manner to ensure your reasoning and conclusion are correct.

Avoid simply stating the correct answer at the outset.

STUDENT ANSWER: ⟨student_answer⟩
FACTS: ⟨documents⟩