1.
np.array才可以broadcasting
Screen Shot 2017-10-14 at 12.18.38 PM.png2.
Screen Shot 2017-09-23 at 2.44.38 PM.png Screen Shot 2017-09-23 at 2.44.54 PM.png Screen Shot 2017-10-14 at 12.25.23 PM.png3.
乘* 号表示在每个维度上,都是元素对应相乘,得到新的向量。
Screen Shot 2017-09-24 at 6.46.19 AM.png Screen Shot 2017-10-14 at 12.30.42 PM.png Screen Shot 2017-10-14 at 12.30.54 PM.png
4.
-1出现在reshape中
Screen Shot 2017-10-14 at 12.41.28 PM.png
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