38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
from pina.callbacks import SwitchOptimizer
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import torch
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import pytest
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from pina.solvers import PINN
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from pina.trainer import Trainer
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from pina.model import FeedForward
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from pina.problem.zoo import Poisson2DSquareProblem as Poisson
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from pina.optim import TorchOptimizer
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# make the problem
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poisson_problem = Poisson()
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boundaries = ['nil_g1', 'nil_g2', 'nil_g3', 'nil_g4']
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n = 10
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poisson_problem.discretise_domain(n, 'grid', locations=boundaries)
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poisson_problem.discretise_domain(n, 'grid', locations='laplace_D')
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model = FeedForward(len(poisson_problem.input_variables),
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len(poisson_problem.output_variables))
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# make the solver
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solver = PINN(problem=poisson_problem, model=model)
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adam_optimizer = TorchOptimizer(torch.optim.Adam, lr=0.01)
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lbfgs_optimizer = TorchOptimizer(torch.optim.LBFGS, lr= 0.001)
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def test_switch_optimizer_constructor():
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SwitchOptimizer(adam_optimizer, epoch_switch=10)
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def test_switch_optimizer_routine():
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# make the trainer
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switch_opt_callback = SwitchOptimizer(lbfgs_optimizer, epoch_switch=3)
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trainer = Trainer(solver=solver,
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callbacks=[switch_opt_callback],
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accelerator='cpu',
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max_epochs=5)
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trainer.train()
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