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This post is a summary of the code I wrote in Python for my then-desperate wife to automatically generate hundreds of invoices. Suppose you have an excel sheet with hundreds of rows and a couple of columns (a sample is shown below), and would like to generate pdf reports for individual rows according to column values. With MS office, the sheet...

Disclaimer: this guideline is only suggested for servers within secure local connections, e.g. within an institution or corporation’s network. SSH port forwarding is a common way of connecting to remote jupyter notebooks. This typically takes three steps: run jupyter on the server, ssh tunneling to the jupyter instance, and then type the localh...

Here we mean scientific models, not fashion models;) What is a model? Supposing we want to know how fast the enzymes in our stomach catalyze the digestion of the proteins in our food, we first need to understand in general how enzymatic reactions work. As early as 1903, Victor Henri discovered that the enzymatic reactions were initiated by a bin...

In an earlier post, we get to know the concept of Bayesian reasoning. In this post we show Bayesian way of inferring basic statistics and briefly compare the Maximum a Posteriori to Maximum likelihood. As a simple example of Bayesian inference in action, we estimate the expectation \(\mu\) of univariate Gaussian with known variance \(\sigma^2\)...

For minimizing a differentiable multivariable function \(f(\mathbf x)\) with initial value of \(\mathbf x_0\), the fastest decreasing would be the direction of negative gradient of \(f(x)\) since its gradient points to fastest ascending direction. The updating rule

This post is an expansion of my answer on Cross Validated Intuitively we can take Kullbach-Leibler(KL) divergence which quantifies the distance between two distributions as the error function, but why the cross entropy arises for classification problems? For answering it, let us first recall that entropy is used to measure the uncertainty of a...

Pytorch的设计哲学： GPU版的Numpy 高效灵活的深度学习平台

Update July 2018: This post is outdated as the issues stated at the time of writing are not issues anymore. It is still kept for potential interest.