gabrielgoh | 6 years ago | on: Epidemic Calculator
gabrielgoh's comments
gabrielgoh | 6 years ago | on: Epidemic Calculator
(author here) - that is correct, those aren't sliders, just waypoints
gabrielgoh | 6 years ago | on: Epidemic Calculator
good questions! (author here)
I've had a hard time trying to find hard figures on these numbers, and am trying to steer as much from speculation as possible.
Your second observation is a very good one. This is true, e.g. for the default intervention. Adding initial infections has a similar effect to waiting, and delaying an intervention can have a tremendous effect (at least according to the model) on the course of the epidemic
gabrielgoh | 7 years ago | on: Optimization: An Introduction (2006) [pdf]
See the literature on exact penalty methods. I believe the short of it is yes, for a large class of problems this works, but the new problem will not be necessarily easier to solve. In the case of the abs(.) function, the nonlinearity at 0 makes subgradient methods slow, and the large constant in front of the abs(.) might prove numerically unstable.
gabrielgoh | 7 years ago | on: This is the most complete guide to finding anyone’s email
email them
gabrielgoh | 7 years ago | on: A high bias low-variance introduction to Machine Learning for physicists
I guess the author is not claiming a well rounded (low bias) introduction to ML to statistics, but a highly biased and specialized (low variance) course that is tailored to the author's own interests and tastes.
gabrielgoh | 8 years ago | on: Mathematical Illustrations: A manual of geometry and postscript
the illustration shows 4 an approximation with quadratic curves. There's no point drawing the one with 8 as it would be indistinguishable, as the article points out
gabrielgoh | 8 years ago | on: A UI Experiment with the iPhone X’s Front-Facing Camera
I don't think so. This effect, at least as described, can change even as the phone remains static, e.g. if you head moves while the phone sits still on the table.
gabrielgoh | 8 years ago | on: Machine learning algorithms used to decode and enhance human memory
could you clarify what you mean by an open-loop system, and why it must be compared with a closed-loop one?
gabrielgoh | 8 years ago | on: Non-Convex Optimization for Machine Learning
A simple example of this that has been shown rigorously is compressed sensing. Finding the sparsest vector, subject to linear constraints Ax = b is NP hard for general matrices, but is solvable in polynomial time if A satisfies the RIP property (e.g. w.h.p if A is generated by randomly sampling gaussians for each entry). Quite surprising!
gabrielgoh | 8 years ago | on: Buried Ice Water Discovered on Mars
is this a real concern? it should be relatively easy to distinguish life on earth from life on mars, should it exist. Especially considering it comes from a completely new path of evolution.
Furthermore, a mars station would allow science to be done directly on mars, rather than having payloads of material sent to and from earth.
gabrielgoh | 8 years ago | on: Evidence of exponential speed-up in the solution of hard optimization problems?
they did experiments on the 2016 Max-SAT challenge, which seems to me like a legitimate class of problem instances.
gabrielgoh | 8 years ago | on: Face ID beaten by mask
i enjoyed the presentation, he has a flair for the dramatic.
gabrielgoh | 8 years ago | on: Alpha Go Zero: How and Why It Works
could you elaborate on this point? what you're saying sounds like dynamic programming, which does not reduce the state space at all, just saves on redundant computations (and is a favourite of programming interviews everywhere)
gabrielgoh | 8 years ago | on: Modern terminal-based text editor
When working over ssh, its handy to have a text editor for making small edits here and there. I'm very excited about this editor!
gabrielgoh | 8 years ago | on: How are PCA and SVD related?
6 word answer
PCA is the SVD of A'A
gabrielgoh | 8 years ago | on: Show HN: Mathcha – Online Mathematics Editor
to those who are looking for a WYSIWYG editor which supports latex, try LyX. It's good and intuitive enough that I have used it as a tool for thought, and prefer to work straight from latex rather than a whiteboard or a paper and pen.
gabrielgoh | 8 years ago | on: The 'creepy Facebook AI' story that captivated the media
A fascinating aspect of this entire kerfuffle is that the meta story, the one about sensationalism and "bad journalism" is too, a form of media sensationalism that plays to the ears of a more sober and skeptical audience who wants news about "media sensationalism" and "AI hype".
A bit of digging reveals that no serious news outlet really got this wrong (correct me if I'm wrong!), and most of the sensationalist headlines were from British tabloids
https://www.theatlantic.com/technology/archive/2017/06/what-...
http://www.mirror.co.uk/tech/robot-intelligence-dangerous-ex...
but even more surprisingly, the articles themselves demonstrated a fairly sober understanding of what is going on. The only mistake they made was spinning a mundane story way out of proportion, something tabloids literally every day, and have done since their conception.
gabrielgoh | 8 years ago | on: Gallery of Data Visualization: the Best and Worst of Statistical Graphics
A great collection, but I thought the final diagram of
http://www.datavis.ca/gallery/say-something.php
that illustrated the orders of magnitude of radiation dosage was a great use of visual presentation to illustrate scale - why is it in the hall of shame?
gabrielgoh | 8 years ago | on: Tesla Model 3 Delivery Event Livestream
It'd be interesting in hearing about how far along autonomy is with the model 3, it seems Tesla may be playing it down in this presentation?
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default values are the best guesses for the parameters of the novel coronavirus based on my reading of the literature