def _deprecate_positional_args(f):
    """Decorator for methods that issues warnings for positional arguments

    Using the keyword-only argument syntax in pep 3102, arguments after the
    * will issue a warning when passed as a positional argument.

    Parameters
    ----------
    f : function
        function to check arguments on.
    """
    sig = signature(f)
    kwonly_args = []
    all_args = []

    for name, param in sig.parameters.items():
        if param.kind == Parameter.POSITIONAL_OR_KEYWORD:
            all_args.append(name)
        elif param.kind == Parameter.KEYWORD_ONLY:
            kwonly_args.append(name)

    @wraps(f)
    def inner_f(*args, **kwargs):
        extra_args = len(args) - len(all_args)
        if extra_args > 0:
            # ignore first 'self' argument for instance methods
            args_msg = [
                f"{name}={arg}"
                for name, arg in zip(kwonly_args[:extra_args], args[-extra_args:])
            ]
            warnings.warn(
                (
                    f"Pass {', '.join(args_msg)} as keyword args. From version 0.9 "
                    "passing these as positional arguments will "
                    "result in an error"
                ),
                FutureWarning,
            )
        kwargs.update({k: arg for k, arg in zip(sig.parameters, args)})
        return f(**kwargs)

    return inner_f
Decorator for methods that issues warnings for positional arguments

    Using the keyword-only argument syntax in pep 3102, arguments after the
    * will issue a warning when passed as a positional argument.

    Parameters
    ----------
    f : function
        function to check arguments on.
    
imblearn/utils/_validation.py