Parameters initilization of BatchNorm

[EddieEduardo]

Should parametres in BatchNorm not be initialized ? I just read the way of initializing for the params in Conv2d like follows :
"""
def weights_init(m):
if isinstance(m, nn.Conv2d):
xavier(m.weight.data)
m.bias.data.zero_()
"""
What about the initialization for the params in BN ？ But I did read the net construction with
"def add_extras(cfg, i, batch_norm=True):"
and
"def selector(vgg, extra_layers, batch_normal=True):"
and corresponding calling to them
"return SST(phase, *selector(vgg(base[str(size)], 3),add_extras(extras[str(size)],
1024)),add_final(final[str(size)]), use_gpu )",
or is there something that I mistook ? Welcom to leave your perspectives , thanks a lot.