武陵人走后怎样

“走在古北水镇的马路上,手里端着一杯冷萃,果然咖啡豆里过度烘培的焦糊味被冷萃完美过滤掉了。青石板路歪歪斜斜,导航带我走上一条一人宽的阶梯,两边的墙上路灯亮着,好像放学的孩子走在回家的路上,心满意足无忧无虑。”

计算矩阵函数的导数(以 Word2vec 为例)

一个输出为 ,输入为 的矩阵函数的导数是一个大小为 的(广义)雅可比张量。

Posted Mar 8, 2018

理解张量点乘 numpy.tensordot

常数、向量和矩阵两两之间的点乘都很容易理解,更高维的张量的点乘也许难以很直观地理解,但是其实也只是一些乘法和加法而已。

Posted Mar 7, 2018

Calculate gradients for a neural network with one hidden layer

I have always been struggling with calculating gradients in Back Propagation, especially when there are matrices involved. Here I will talk about how I solved the question below as an exercise. It is question 2(c) in Assignment 1 of CS224n, Winter 2017 from Stanford.

Posted Feb 9, 2018

《乡土中国》读书笔记

Reading From the Soil by Fei Xiaotong

Posted Oct 20, 2017

Using NASM on macOS and Windows

NASM is the only cross-platform assembler. And it works with Xcode!

Posted Dec 27, 2016

How we are humans

Reading The Language Instinct

Posted Dec 17, 2016

如何看美区 iTunes 电影

有些电影不会在国内上映,不会被国内的视频网站引进,也不会有字幕组分享资源,美区 iTunes 就是唯一的选项,几乎所有的电影上映之后一段时间都会出现在这里。

Posted Jun 24, 2016

生活

一首诗

Posted Feb 28, 2015