Description : save parameter of network weight

def save_model(self, epoch, loss):
        """
        Description : save parameter of network weight
        """
        prefix = 'checkpoint/epoches'
        file_name = "{prefix}_{epoch}_loss_{l:.4f}".format(prefix=prefix,
                                                           epoch=str(epoch),
                                                           l=loss)
        self.net.save_parameters(file_name)