+ @staticmethod
+ def expand_down(relative_width, doublings, current_bound):
+ """Return rate of expanded logarithmic width below.
+
+ :param relative_width: The base relative width to double.
+ :param doublings: How many doublings to do for expansion.
+ :param current_bound: The current target transmit rate to move [pps].
+ :type relative_width: float
+ :type doublings: int
+ :type current_bound: float
+ :returns: Transmit rate smaller by logarithmically double width [pps].
+ :rtype: float
+ """
+ for _ in range(doublings):
+ relative_width = MultipleLossRatioSearch.double_relative_width(
+ relative_width)
+ return current_bound * (1.0 - relative_width)
+