rkevingibson (u/rkevingibson)

rkevingibson commented on How Mandelbrot set images are affected by floating point precision github.com/ProfJski/Float... · Posted by u/todsacerdoti

rkevingibson · 2 years ago

From a cursory look at the code, I don't see any use of fused-multiply-add (FMA) which would likely help with precision issues in a number of places with the float version. The "problem in more detail"[1] readme specifically calls out computation of `x^2 - y^2` as a source for error, and that has methods that dramatically reduce error with FMAs[2].

[1] https://github.com/ProfJski/FloatCompMandelbrot/blob/master/... [2] https://pharr.org/matt/blog/2019/11/03/difference-of-floats

rkevingibson commented on Washington state approves capital gains tax geekwire.com/2021/washing... · Posted by u/elsewhen

seattle_spring · 5 years ago

For those that support this, I have a question:

Combined with the federal tax changes, this may increase LTCG rates for Washington residents to more than 60%. I can see folks wanting this for people that regularly make more than a million a year, but what about the situation more common amongst this community where you take below-market pay in exchange for a potential lump payout in one year.

For example, say a startup employee works somewhere for 6 years. They reach a moderately successful exit and realize $1.2m all at once.

Do you feel it's fair they lose more than half of at least some of that money to taxes, even though if they would have realized it equally over those 6 years they would have paid far less in taxes?

rkevingibson · 5 years ago

Not sure how you arrived at 60% - aren't federal capital gains topped off at 20%, and this bill only 7% for gains over $250,000?

Even if it is 60%, I think that's reasonable. In your case, why is the employee selling all of their stock in one year? If they sell over multiple years, they could get gains of up to $250,000 without paying any state tax, which is plenty.

I'd also be in favor of a state income tax, since the sales tax regime in Washington is very regressive.

rkevingibson commented on Neural Networks as Ordinary Differential Equations rkevingibson.github.io/bl... · Posted by u/agronaut

itin · 7 years ago

specifically, I don't see where the last step G(h_t) = etc. follows from

rkevingibson · 7 years ago

Yup, that's a mistake. Shouldn't have the +h term at the end.

rkevingibson commented on Neural Ordinary Differential Equations arxiv.org/abs/1806.07366... · Posted by u/asparagui

duvenaud · 7 years ago

Senior author here, I'm happy to answer any questions.

We just released source code: https://github.com/rtqichen/torchdiffeq . This includes PyTorch implementations of adaptive ODE solvers that can be differentiated through automatically. So you can mix and match these ODE solvers with any other differentiable model component.

There's already been a bit of follow-up work, turning Continuous Normalizing Flows into a practical generative density model: https://arxiv.org/abs/1810.01367

And now we're mainly working on 1) Regularizing ODE nets to be faster to solve and 2) getting the time-series model to scale up and extend it to stochastic differential equations.

rkevingibson · 7 years ago

I'm a little late to this thread, but wanted to thank you for the paper! I found it interesting enough to blog about it (https://rkevingibson.github.io/blog/neural-networks-as-ordin...).

I wonder if you've given any thought to generalizing to fractional differential equations? My intuition tells me that the dynamics that you're learning are "local" in the sense that the ODE solvers depend only on the current state (and maybe some recent history), whereas learning the dynamics of a fractional system could give the system a larger "history" in the case of your time-series models.

rkevingibson commented on RIP Turkey, 1921 – 2017 foreignpolicy.com/2017/04... · Posted by u/sushobhan

dleslie · 9 years ago

The party whip makes parliamentary confirmations a formality.

rkevingibson · 9 years ago

Only if the current party has a majority government, which isn't always the case.

rkevingibson commented on Mdmath – LaTeX Math for Markdown inside of Visual Studio Code github.com/goessner/mdmat... · Posted by u/fango

rkevingibson · 9 years ago

Surprised I haven't seen anyone post Markdeep here yet: https://casual-effects.com/markdeep/

Seems to cover a lot of the same ground, though it's not restricted to visual studio code.

rkevingibson commented on Yes, You Have Been Writing SPSC Queues Wrong vitorian.com/x1/archives/... · Posted by u/NotThe1Pct

rkevingibson · 9 years ago

I'm curious what you think the problems are that unbounded indices causes? Unsigned overflow is well defined in C++, so I don't see the problem here. AFAIK, the only issue would be with requiring power of 2 sizes.

rkevingibson commented on October Special Event Keynote [video] apple.com/apple-events/oc... · Posted by u/0x7fffffff

rkevingibson · 9 years ago

So they managed to make the touchpad twice as large, but couldn't find room for a row of keys?

rkevingibson commented on Ask HN: Why are newspapers not talking about Wikileaks? · Posted by u/angry-hacker

rkevingibson · 9 years ago

I've seen articles in the past few days about the email leaks on the washington post, and looking on CNN right now I see an article on the Podesta emails on the politics page. I've seen a lot of talk about hacking and emails this election. I would say the media is talking more about Trump's sexual assault accusers right now because either: a) The emails haven't been verified (as far as I know) b) There's nothing in them as scandalous as a sex scandal (as far as I can tell) c) Trump keeps saying scandalous things, which draws attention to himself.

A lot of the problems with the media, as far as I can tell, stem from the fact that no one is paying for it anymore. This leads the media to going for attention grabbing headlines, which means a sex scandal will always win out over any allegations of corruption.

rkevingibson commented on JALI: Animator-Centric Procedural Lip Synch youtube.com/watch?v=vniMs... · Posted by u/rkevingibson

rkevingibson · 10 years ago

This is the research project of another PhD student in my lab. It takes an audio file and a script and generates a facial animation to lip synch to the audio. The key contribution (in my view) is that the animation curves it generates are much simpler than those generated by motion capture, so even when the results aren't perfect, they are easily tweaked by animators.