[SOLVED]
params = self.net.state_dict()
pas = list(params['net.0.weight']) + list(params['net.0.bias']) + list(params['net.3.weight'] + list(params['net.3.bias'])  + list(params['net.6.weight']) + list(params['net.6.bias']))
self.optimizer1 = optim.Adam(pas, lr = 0.01)

Here is my code. I think everything is ok