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33 lines
914 B
Python
33 lines
914 B
Python
from typing import Iterator, List
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from pts.feature import Chain, Transformation
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from .common import DataEntry, Dataset
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class TransformedDataset(Dataset):
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"""
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A dataset that corresponds to applying a list of transformations to each
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element in the base_dataset.
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This only supports SimpleTransformations, which do the same thing at
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prediction and training time.
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Parameters
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----------
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base_dataset
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Dataset to transform
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transformations
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List of transformations to apply
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"""
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def __init__(
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self, base_dataset: Dataset, transformations: List[Transformation]
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) -> None:
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self.base_dataset = base_dataset
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self.transformations = Chain(transformations)
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def __iter__(self) -> Iterator[DataEntry]:
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yield from self.transformations(self.base_dataset, is_train=True)
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def __len__(self):
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return sum(1 for _ in self)
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