Change L-BFGS option gtol

Author: lululxvi

deepxde/train.py

@@ -29,10 +29,11 @@ def get_train_op(loss, optimizer, lr=None, decay=None):
                 "disp": None,
                 "maxcor": 50,
                 "ftol": np.finfo(float).eps,
-                "gtol": 1e-5,
+                "gtol": 1e-8,
                 "eps": 1e-8,
                 "maxfun": 15000,
                 "maxiter": 15000,
+                "iprint": -1,
                 "maxls": 50,
             },
         )