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Use `deque` for batch queue in `_PrefetchDataFetcher` - #22052

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deep1blue:perf/prefetch-data-fetcher-deque

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Use `deque` for batch queue in `_PrefetchDataFetcher`#22052
deep1blue wants to merge 2 commits into
Lightning-AI:masterfrom
deep1blue:perf/prefetch-data-fetcher-deque

Commits on Oct 23, 2026
- Use deque for O(1) batch queue pops in _PrefetchDataFetcher
  deep1blue
  committed
  35b092b
Commits on Oct 29, 2026
- test: assert reset() empties pending prefetched batches instead of isinstance
  
  deep1blue
  and
  Copilot
  committed
  60ff6ed