Sigmoid 函數
Sigmoid 函數（英文：sigmoid function，借入粵語作粵拼：sik1 moi4，假借作息牦moi4）係統稱啲有S形曲線嘅函數嘅，因為呢啲函數嘅圖畫出嚟好似拉長嘅「S」咁，又叫做S型函數或S型曲線。息牦函數係有界、可微嘅實函數，係實數範圍內都有取值，而且導數始終唔會係負嘅。
最常見嘅息牦函數係Logistic 函數（logistic function）：
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