PACELC theorem
A few years ago I learned about ACID, BASE, and the CAP theorem.
Recently I learned about an extension, the PACELC theorem. So some recap:
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Evolution of HTTP
In the beginning, there were HTTP. Then we started to version it. First we have HTTP/0.9, then HTTP/1.0 (RFC1945), then HTTP/1.1 (RFC2068 in 1997), and recently we have HTTP/2 (RFC7540 in 2015) and HTTP/3 (Internet draft in 2018). So it should be a time to review how the protocol evolved...
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Solving Sudoku with Simulated Annealing
Recently I encountered a problem of mixed integer programming with linear constraints but non-linear convex objective function. There do not seem to have any nice solver package available in Python. Even if I tried to look for anything with a C/C++ API, there are not many open source solutions, AFAIK....
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Gaussian copula and multivariate normal distribution
This is a failed attempt to simplify the process to generate multivariate
Gaussian distribution by utilizing the
copula function.
However, it has the merit of figuring out what information a copula function
failed to provide.
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Agrawal et al (2018) A rewriting system for convex optimization problems
I learn about this paper when I am studying the python package cvxpy. This is an interface to other solvers such as glpk and Boyd who authored the book of Boyd & Vandenberghe is one of the creator. This package, however, requires some special formulation of the problem called “disciplined...
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