code_filter.py

def code_filter(code):
    """
    Filters out low quality training code, with an aim to improving benchmark performance.  Works best with Python.
    """
    # Python keywords
    keywords = ["assert", "async", "await", "break", "class", "continue", "def", "del", "elif", "else", "except",
                "finally", "for", "from", "global", "if", "import", "in", "is", "lambda", "nonlocal", "not", "or",
                "pass", "raise", "return", "try", "while", "with", "yield"]
    # This covers single line comments in python + other common languages
    comment_symbols = ["#", "//"]

    # Filter out todos
    pattern = r'TODO.{0,3}(put|fill|implement|write|your)'
    if re.search(pattern, code, flags=re.IGNORECASE):
        return False

    # Filter commented code
    pattern = "|".join([re.escape(symbol) + '.{0,1}' + keyword + r'\s' for symbol in comment_symbols for keyword in keywords])
    if re.search(pattern, code):
        return False
    
    # Filter out numbers after comment symbols
    pattern = r'\#.{0,1}1\.\s|/.{0,1}1\.\s'
    if re.search(pattern, code):
        return False

    # Empty comments
    pattern = r'(#|//)\n'
    if re.search(pattern, code):
        return False

    # Functions not implemented
    if "\n  pass" in code or "\n    pass" in code or "NotImplemented" in code:
        return False

    # Ensure we return something in at least one line
    pattern = r'^\s*return\s(?!None).+$'
    if not re.search(pattern, code, re.MULTILINE):
        return False

    return True