对于习惯使用 PyTorch 或 TensorFlow 的用户来说，调用 nn.LSTM 虽然高效，但也屏蔽了最核心的数学推导，结果代码写了好几年，loss 是怎么传回去的，脑子里还是一团浆糊。

Margin Lab has detected a 4.1% performance decline in Claude Code over 30 days through daily benchmarks, with 655 evaluations showing statistically valid degradation.

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