Thoughts on data science, statistics and machine learning.

Evangelism in Foss

One of the most dangerous things that can affect any FOSS community is the tendency of evangelism for the sake of evangelism. Promoting the Python stack, expanding the userbase, etc, should come only as a consequence of the content we produce as developers. If evangelism even remotely becomes one of your goals, your quality is sure to suffer. And it’s not just the empirical evidence that prompts me to say this.

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Organizing a Bookshelf with Multivariate Analysis

I have recently moved from Pune to Delhi. I had spent only a year in Pune, having moved there from Mumbai, where I lived for three years. Whenever I move, the bulk of my luggage consists of books and clothes. My stay in Pune was just a transition, so I never bothered to unpack and store all my stuff too carefully. Thus, a corner of my bedroom in my Pune apartment always looked like this: The actual volume of books that I carried from Pune to Delhi is about twice of what is seen in the picture.

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Limitations of the Fourier Transform

My implementation of the Hilbert Huang transform (PyHHT) is quite close to a beta release. After nearly three years of inactivity, I’ve found some time to develop the PyHHT library in the last few weeks. In all this time many people have written to me about a lot of things - from the inability to use the module because of the lack of documentation, to comparison between the results of HHT and conventional time series analysis techniques.

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Edge Effects in Empirical Mode Decomposition

It has been a little over three years since I started working on a Python implementation of the Hilbert Huang Transform. When I first presented it at SciPy India 2011 (video) it was just a collection of small scripts, without packaging, testing or even docstrings. Over time PyHHT has garnered some interest, and I have, since the last few weeks, found the time to regularly work on it. I have been able to come up with a decent implementation of empirical mode decomposition, pretty much in line with everything described in the original paper by Huang et al.

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