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The tee() memory cliff: Stream.share() requires explicit buffer configuration. You choose the highWaterMark and backpressure policy upfront: no more silent unbounded growth when consumers run at different speeds.，详情可参考91视频
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常用于： EfficientNet、Transformer。
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Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.