The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
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，这一点在91视频中也有详细论述
Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
公式： Softmax(xi)=exi∑jexj Softmax 输出的是一组归一化的概率，在图中使用 柱状图 (bar chart) 展示每个输入元素对应的概率值。