@samra-irshad, If you look at the equation proposed to calculate the standard deviation by he et al, in the paper https://arxiv.org/abs/1502.01852 1.

where a = the negative slope of the rectifier used after this layer.
So I guess this to initialize the distribution, where mean is zero and std is calculated using the above formula.
https://pytorch.org/docs/stable/modules/torch/nn/init.html#kaiming_uniform 2