圖像來源，Getty Images
What's newI used to recommend the M4 MacBook Pro as a cheaper alternative to the M5 model, but as of February 2026, it's no longer available in new condition at any third-party retailers. (The Apple Store discontinued it right when the M5 MacBook Pro came out.) As such, I've removed all mentions of it from this guide.
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2.4 Leaky ReLU / Parametric ReLU（PReLU）
res[i] = stack.length ? cur - stack[stack.length - 1] : cur;