from typing import Iterable
from typing import Set


def lower_transform(predictions: Iterable[str]) -> Set[str]:
	"""
	Transforms the items of the given Iterable with str.lower() function.\n
	Used as a default transform function.

	Params
	---------
	predictions: (Iterable[str]) Collection of texts to transform.

	Return
	---------
	(Set[str]): Set of transformed items.
	"""
	return {pred.lower() for pred in predictions}