human
I wrote the below code

    if (labeled is None):
        labeled = (toks and isinstance(toks[0], (tuple, list)))
    if labeled:
        def lazy_func(labeled_token):
            return (feature_func(labeled_token[0]), labeled_token[1])
        return LazyMap(lazy_func, toks)
    else:
        return LazyMap(feature_func, toks)

What's a good function header?

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

def apply_features(feature_func, toks, labeled=None):