ee39b39805
* modify examples/problems * modify tutorials --------- Co-authored-by: Dario Coscia <dariocoscia@dhcp-235.eduroam.sissa.it> Co-authored-by: Dario Coscia <dariocoscia@dhcp-015.eduroam.sissa.it>
74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
import argparse
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import torch
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from torch.nn import Softplus
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from pina import Plotter, LabelTensor, Trainer
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from pina.solvers import PINN
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from pina.model import FeedForward
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from problems.parametric_poisson import ParametricPoisson
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class myFeature(torch.nn.Module):
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"""
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"""
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def __init__(self):
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super(myFeature, self).__init__()
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def forward(self, x):
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t = (
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torch.exp(
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- 2*(x.extract(['x']) - x.extract(['mu1']))**2
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- 2*(x.extract(['y']) - x.extract(['mu2']))**2
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)
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)
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return LabelTensor(t, ['k0'])
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description="Run PINA")
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parser.add_argument("--load", help="directory to save or load file", type=str)
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parser.add_argument("--features", help="extra features", type=int)
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parser.add_argument("--epochs", help="extra features", type=int, default=1000)
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args = parser.parse_args()
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if args.features is None:
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args.features = 0
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# extra features
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feat = [myFeature()] if args.features else []
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# create problem and discretise domain
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ppoisson_problem = ParametricPoisson()
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ppoisson_problem.discretise_domain(n=100, mode='random', variables = ['x', 'y'], locations=['D'])
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ppoisson_problem.discretise_domain(n=100, mode='random', variables = ['mu1', 'mu2'], locations=['D'])
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ppoisson_problem.discretise_domain(n=20, mode='random', variables = ['x', 'y'], locations=['gamma1', 'gamma2', 'gamma3', 'gamma4'])
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ppoisson_problem.discretise_domain(n=5, mode='random', variables = ['mu1', 'mu2'], locations=['gamma1', 'gamma2', 'gamma3', 'gamma4'])
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# create model
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model = FeedForward(
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layers=[10, 10, 10],
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output_dimensions=len(ppoisson_problem.output_variables),
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input_dimensions=len(ppoisson_problem.input_variables) + len(feat),
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func=Softplus
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)
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# create solver
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pinn = PINN(
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problem=ppoisson_problem,
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model=model,
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extra_features=feat,
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optimizer_kwargs={'lr' : 0.006}
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)
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# create trainer
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directory = 'pina.parametric_poisson_extrafeats_{}'.format(bool(args.features))
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trainer = Trainer(solver=pinn, accelerator='cpu', max_epochs=args.epochs, default_root_dir=directory)
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if args.load:
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pinn = PINN.load_from_checkpoint(checkpoint_path=args.load, problem=ppoisson_problem, model=model, extra_features=feat)
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plotter = Plotter()
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plotter.plot(pinn, fixed_variables={'mu1': 1, 'mu2': -1})
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else:
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trainer.train()
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