Fig. 3

Train and test loss to the problem (32) using the optimization algorithms a SGD, b RMSprop, c Adam, d LBFGS-B, and e LBFGS-B+Adam
Train and test loss to the problem (32) using the optimization algorithms a SGD, b RMSprop, c Adam, d LBFGS-B, and e LBFGS-B+Adam