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65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
"""Deterministic answer grading + coarse error classification for Mastery Path."""
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from __future__ import annotations
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from difflib import SequenceMatcher
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import re
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from deeptutor.learning.models import ErrorType
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def grade_answer(user_answer: str, expected_answer: str, question_type: str = "short") -> bool:
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"""Grade user answer against expected answer.
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Args:
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user_answer: The user's submitted answer.
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expected_answer: The stored expected answer.
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question_type: One of "choice", "short", "open".
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Returns:
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True if answer is correct.
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"""
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user = user_answer.strip().lower()
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expected = expected_answer.strip().lower()
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if not expected:
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return False
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if question_type == "choice":
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user_norm = user.replace(" ", "")
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expected_norm = expected.replace(" ", "")
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return user_norm == expected_norm
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if question_type == "short":
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if user == expected:
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return True
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if len(expected) <= 30:
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return SequenceMatcher(None, user, expected).ratio() >= 0.85
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return False
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if question_type == "open":
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keywords = [k.strip() for k in re.split(r"[,;，；。\n]+", expected) if k.strip()]
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if not keywords:
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return False
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matched = sum(1 for kw in keywords if kw in user)
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return matched / len(keywords) >= 0.6
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return False
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def classify_error(user_answer: str) -> ErrorType:
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"""Coarse error classification for a wrong answer.
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A blank answer signals the student did not know (metacognitive); anything
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else is treated as a wrong application. The richer four-type taxonomy is
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assigned later by the LLM in the error-diagnosis stage.
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"""
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from deeptutor.learning.models import ErrorType
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return ErrorType.METACOGNITIVE if not user_answer.strip() else ErrorType.APPLICATION_ERROR
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__all__ = ["grade_answer", "classify_error"]
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