比爾·蓋茨據報承認與兩俄羅斯女性有染並道歉 梅琳達稱想起「令人痛苦的時光」
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f(x)=(xW1)⊙σ(xW2)
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.