Initialize `m` weights with `func` and set `bias` to 0.

def init_default(m:nn.Module, func:LayerFunc=nn.init.kaiming_normal_)->None:
    "Initialize `m` weights with `func` and set `bias` to 0."
    if func:
        if hasattr(m, 'weight'): func(m.weight)
        if hasattr(m, 'bias') and hasattr(m.bias, 'data'): m.bias.data.fill_(0.)
    return m