104 lines
3.6 KiB
Python
104 lines
3.6 KiB
Python
""" Trainer module. """
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import torch
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import pytorch_lightning
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from .utils import check_consistency
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from .data import PinaDataModule
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from .solvers.solver import SolverInterface
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class Trainer(pytorch_lightning.Trainer):
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def __init__(self, solver, batch_size=None, train_size=.7, test_size=.2,
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eval_size=.1, **kwargs):
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"""
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PINA Trainer class for costumizing every aspect of training via flags.
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:param solver: A pina:class:`SolverInterface` solver for the differential problem.
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:type solver: SolverInterface
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:param batch_size: How many samples per batch to load. If ``batch_size=None`` all
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samples are loaded and data are not batched, defaults to None.
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:type batch_size: int | None
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:Keyword Arguments:
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The additional keyword arguments specify the training setup
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and can be choosen from the `pytorch-lightning
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Trainer API <https://lightning.ai/docs/pytorch/stable/common/trainer.html#trainer-class-api>`_
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"""
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super().__init__(**kwargs)
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# check inheritance consistency for solver and batch size
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check_consistency(solver, SolverInterface)
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if batch_size is not None:
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check_consistency(batch_size, int)
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self.train_size = train_size
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self.test_size = test_size
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self.eval_size = eval_size
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self.solver = solver
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self.batch_size = batch_size
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self._create_loader()
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self._move_to_device()
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def _move_to_device(self):
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device = self._accelerator_connector._parallel_devices[0]
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# move parameters to device
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pb = self.solver.problem
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if hasattr(pb, "unknown_parameters"):
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for key in pb.unknown_parameters:
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pb.unknown_parameters[key] = torch.nn.Parameter(
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pb.unknown_parameters[key].data.to(device)
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)
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def _create_loader(self):
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"""
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This method is used here because is resampling is needed
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during training, there is no need to define to touch the
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trainer dataloader, just call the method.
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"""
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if not self.solver.problem.collector.full:
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error_message = '\n'.join(
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[
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f"""{" " * 13} ---> Condition {key} {"sampled" if value else
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"not sampled"}"""
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for key, value in
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self._solver.problem.collector._is_conditions_ready.items()
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]
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)
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raise RuntimeError('Cannot create Trainer if not all conditions '
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'are sampled. The Trainer got the following:\n'
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f'{error_message}')
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devices = self._accelerator_connector._parallel_devices
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if len(devices) > 1:
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raise RuntimeError("Parallel training is not supported yet.")
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device = devices[0]
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data_module = PinaDataModule(problem=self.solver.problem, device=device,
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train_size=self.train_size,
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test_size=self.test_size,
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eval_size=self.eval_size)
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data_module.setup()
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self._loader = data_module.train_dataloader()
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def train(self, **kwargs):
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"""
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Train the solver method.
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"""
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return super().fit(
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self.solver, train_dataloaders=self._loader, **kwargs
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)
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@property
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def solver(self):
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"""
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Returning trainer solver.
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"""
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return self._solver
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@solver.setter
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def solver(self, solver):
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self._solver = solver
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