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这篇文章很好地解释了forward mode：https://jingnanshi.com/blog/autodiff.html，但是backward mode省略了太多细节。 如果记不清backward mode怎么work的了，可以看这篇文章：https://rufflewind.com/2016-12-30/reverse-mode-automatic-differentiation。这篇文章从更简单的角度讲解了，并且用的例子也更简单。

I will change my company soon. The follow is to record some advice from more senior engineers and leaders.

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graph TB; A[Do you have a problem in your life?] B[Then don't worry] C[Can you do something about it?] A--no-->B; A--yes-->C; C--no-->B; C--yes-->B; graph TB; A[Client] B[Master] C[Secondary Replica A] D[Primary Replica] A --> B; B --> A; A ==> C; A --> D; ...