Stay curious. Look closely.保持好奇，认真看世界。
Start with a question or an observation. Make complex ideas clear, and keep the details worth noticing.从具体的问题与观察出发，把复杂的原理讲清楚，把值得留意的细节记录下来。
A matrix multiplication selects an implementation for its device and, when gradients are needed, records dependencies for the backward pass.一次矩阵乘法先选择设备上的实现；需要求导时，还会记录依赖关系，供反向传播使用。
The eye forms an image; the retina converts light into electrical responses and processes color and contrast before signals reach the brain.眼睛先成像，视网膜再把光转成电信号；神经回路提取颜色与对比，传向大脑。
From Shantou’s arcades to Nan’ao’s coast, then Chaozhou’s bridge, old streets and lingering flavours.从汕头的骑楼走到南澳的海边，再去潮州看桥、逛街、尝一碟咸鲜。
Submerged branches, reflected clouds and streams through grass: photographs lead back into the small details of Jiuzhaigou’s blue.水底倒木、半山云影、草间细流：沿着几张照片，重看九寨沟青碧深处的细节。
Compilation can fuse compatible operations and avoid intermediate data; later calls reuse the cached code only while its assumptions hold.编译把兼容运算融合，减少中间数据；输入仍满足缓存版本的条件时，后续调用才能复用它。
When several paths depend on one value, backward execution adds their gradient contributions before continuing through the graph.同一个变量沿多条路径影响结果时，反向传播先汇总各路梯度，再向它的上游继续计算。
A CPU call can return before the GPU finishes. Streams order work; synchronization boundaries determine what a timing actually measures.CPU 返回时，GPU 可能还没算完；流确定工作顺序，同步边界决定计时究竟测到了什么。
Derivations, experiments, and moments worth keeping.推导、实验，还有值得留下的片刻。
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