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37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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from pydantic import BaseModel
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from bytelatent.data.iterators.abstract_iterator import IteratorState, StatefulIterator
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from bytelatent.data.iterators.arrow_iterator import (
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ArrowFileIterator,
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ArrowFileIteratorState,
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)
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class LoopingIteratorState(BaseModel, IteratorState):
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file_iterator_state: ArrowFileIteratorState
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epoch: int
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def build(self) -> "LoopingIterator":
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return LoopingIterator(
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file_iterator=self.file_iterator_state.build(),
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epoch=self.epoch,
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)
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class LoopingIterator(StatefulIterator):
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def __init__(self, file_iterator: ArrowFileIterator, epoch: int = -1):
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self.file_iterator = file_iterator
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self.epoch = epoch
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def get_state(self):
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return LoopingIteratorState(
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file_iterator_state=self.file_iterator.get_state(), epoch=self.epoch
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)
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def create_iter(self):
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while True:
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self.epoch += 1
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iterator = self.file_iterator.create_iter()
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yield from iterator
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