Qingkai Kong
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Convert word document to PDF with hyperlinks on Mac
Recently, I need to generate a PDF from a word document on Mac with hyperlinks in it. I found that if I directly print it to PDF, the hyperlinks will not work anymore. It searched online, and found two ways that I can have the hyperlinks work again. First m...
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2018 - I am coming
How time flies! We are at 2018! Happy new year, everyone! Look back of last year, I feel I am really lucky to have so much different experiences, the selected highlights are: I had a faculty job interview at one university, even though I didn't get the job,...
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Use K-D Tree to query points - Part 2 (Use geo-coordinates and real distances)
In the previous post, we talked about using KD-tree to find the closest points from a reference point in a group. But we notice that it is using the  Euclidean distance . In reality, we use the points on the earth, and want to use the real distance between ...
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Use K-D Tree to query points - Part 1
We have a group of 2D points, for example, group A, contains 50 data points. We have another point B (or another group of points), that we want to find n points in A that are closest to the point in B. How do we do that? The simplest thinking is that, we ca...
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Create discrete colormap
Many times, we need different color scales to emphasize different parts. But sometimes, we want to specify some color maps by ourselves, there are  ways to do this . Also, sometimes, we want to specify some colors bins, and if my value falls into the bin, I...
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What is ablation study in machine learning
We often come across 'ablation study' in machine learning papers, for example, in this paper with the original R-CNN , it has a section of ablation studies. But what does this means? Well, we know that when we build a model, we usually have different compon...