how to access objective value for trained model

[JayYDG]

For example in 4.DiffusionEquation.ipynb

After training, I would like to access the value of 'ell_f' and 'ell_u' on the test data. Below is my code:

# evaluate trained PINN on test data
PINN = problem.nodes[0]
y1= PINN(test_data.datadict)['y_hat']
ell_f({**PINN(test_data.datadict), **test_data.datadict})

[JayYDG]

Add following code solve problems
X_test.requires_grad = True
T_test.requires_grad = True