human
Here's a good function header given the following:
I wrote the below code

    @wraps(func)
    def check_pipeline(self, *args, **kwargs):
        bad_pipeline = True
        num_test = 0
        while (bad_pipeline and (num_test < NUM_TESTS)):
            args = [(self._toolbox.clone(arg) if isinstance(arg, creator.Individual) else arg) for arg in args]
            try:
                with warnings.catch_warnings():
                    warnings.simplefilter('ignore')
                    expr = func(self, *args, **kwargs)
                    expr_tuple = (expr if isinstance(expr, tuple) else (expr,))
                    for expr_test in expr_tuple:
                        pipeline_code = generate_pipeline_code(expr_to_tree(expr_test, self._pset), self.operators)
                        sklearn_pipeline = eval(pipeline_code, self.operators_context)
                        if self.classification:
                            sklearn_pipeline.fit(pretest_X, pretest_y)
                        else:
                            sklearn_pipeline.fit(pretest_X_reg, pretest_y_reg)
                        bad_pipeline = False
            except BaseException as e:
                if (self.verbosity > 2):
                    message = '_pre_test    decorator:    {fname}:    num_test={n}    {e}'.format(n=num_test, fname=func.__name__, e=e)
                    if (not isinstance(self._pbar, type(None))):
                        self._pbar.write(message)
                    else:
                        print(message)
            finally:
                num_test += 1
        return expr
    return check_pipeline

What's a good function header?
assistant
#Here's a good function header.

def _pre_test(func):