新版教程英文原文勘误表.md

新版UFLDL教程英文原文勘误表（Errata）

逻辑斯特回归

原文：位于 练习 1B（Exercise 1B）
Each of the digits is is represented by a 28x28 grid of pixel intensities, which we will reformat as a vector x(i) with 28*28 = 784 elements. The label is binary, so y(i)∈{0,1}.

多写了一个 is 。