53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
"""GLVQ example using the spiral dataset."""
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import prototorch as pt
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import pytorch_lightning as pl
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import torch
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class StopOnNaN(pl.Callback):
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def __init__(self, param):
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super().__init__()
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self.param = param
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def on_epoch_end(self, trainer, pl_module, logs={}):
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if torch.isnan(self.param).any():
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raise ValueError("NaN encountered. Stopping.")
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if __name__ == "__main__":
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# Dataset
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train_ds = pt.datasets.Spiral(n_samples=600, noise=0.6)
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# Dataloaders
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train_loader = torch.utils.data.DataLoader(train_ds,
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num_workers=0,
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batch_size=256)
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# Hyperparameters
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nclasses = 2
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prototypes_per_class = 20
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hparams = dict(
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distribution=(nclasses, prototypes_per_class),
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prototype_initializer=pt.components.SSI(train_ds, noise=1e-1),
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transfer_function="sigmoid_beta",
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transfer_beta=10.0,
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lr=0.01,
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)
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# Initialize the model
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model = pt.models.GLVQ(hparams)
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# Callbacks
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vis = pt.models.VisGLVQ2D(train_ds, show_last_only=True, block=True)
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snan = StopOnNaN(model.proto_layer.components)
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# Setup trainer
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trainer = pl.Trainer(
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max_epochs=200,
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callbacks=[vis, snan],
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)
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# Training loop
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trainer.fit(model, train_loader)
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