2Lottery Ticket Hypothesis states that each neural model contains a sub-
network (a “winning ticket”) that can match or even outperform the perfor-
mance of the original model when trained in isolation.

mask matrix in Child-TuningD is constructed by setting the
position of the child network to be 1 and the non-child network
to be 0.
Parameter-EfficientFine-TuningMethods