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Dropout 的共享子网络机制落到 GPT 训练

Hinton 把 dropout 解释为许多共享权重的子网络;Karpathy 在 GPT 教程中每轮随机屏蔽节点,并在测试时启用完整网络,提供同一正则化机制的具体实现。

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对照原文

all of these architectures are sharing the same weights, which is regularizing them a lot.
Brains, Sex, and Machine Learning · ▶ 17:13–17:20
training an ensemble of sub networks and then at test time everything is fully enabled
Let's build GPT: from scratch, in code, spelled out. · ▶ 99:07–99:16

测试时启用完整非线性网络并不等于显式平均所有子网络;也不能把教程多项扩容带来的效果单独归因于 dropout。