Math Answer Verification with Equivalence Checking

import re
from typing import Union

def normalize_answer(answer: str) -> str:
    answer = answer.strip()
    answer = answer.replace(" ", "")
    answer = re.sub(r'\\left|\\right', '', answer)
    answer = answer.replace("\\frac", "frac")
    answer = answer.replace("\\cdot", "*")
    answer = answer.replace("\\times", "*")
    return answer

def try_parse_number(s: str) -> Union[float, None]:
    s = s.strip().replace(",", "")
    # Handle fractions like 3/4
    frac_match = re.match(r'^(-?\d+)\s*/\s*(-?\d+)$', s)
    if frac_match:
        num, den = int(frac_match.group(1)), int(frac_match.group(2))
        return num / den if den != 0 else None
    try:
        return float(s)
    except ValueError:
        return None

def math_answer_verify(
    student_answer: str,
    reference_answer: str,
    tolerance: float = 1e-6
) -> bool:
    s_num = try_parse_number(student_answer)
    r_num = try_parse_number(reference_answer)

    if s_num is not None and r_num is not None:
        return abs(s_num - r_num) <= tolerance

    s_norm = normalize_answer(student_answer)
    r_norm = normalize_answer(reference_answer)

    return s_norm == r_norm