Original Weights can simply be calculated by removing the weight norm from the currrent weight norm layer, using the function “torch.nn.utils.remove_weight_norm(layer)”
Please run the below  code snippet once and check output values :
l = nn.Linear(2, 4)
print(l.state_dict())
w1 = weight_norm(l, name="weight")
print(w1.state_dict())
remove_weight_norm(w1)
print(w1.state_dict())