raluk

10 дней назадdiscuss

In similar fashon in year 2009 Amazon deleted books from Kindle. One of them was 1984 from George Orwell.

16 дней назадdiscuss

This algebra is also called bicyclic semigroup https://en.wikipedia.org/wiki/Bicyclic_semigroup

2 месяца назадdiscuss

In C / C++ there are two kinds of undefined behaviour. One is where there is written in standard what UB is. Another one is everthing else that is not in standard.

raluk

3 месяца назадdiscuss

Spending few weeks trying to understand Kalman filterm, I figured out that I need to understand all if the following:

1. Model of system

2. Internal state

3. How is optimal estimation defined

4. Covariance (statistics)

Kalman filter is optimal estimation of internal state and covariance of system based on measurements so far.

Kalman process/filter is mathematical solution to this problem as the system is evolving based on input and observable measurements. Turns out that internal state that includes both estimated value and covariance is all that is needed to fully capture internal state for such model.

It is important to undrstand, that having different model for what is optimum, uncertenty or system model, compared to what Rudolf Kalman presented, gives just different mathematical solution for this problem. Examples of different optimal solutions for different estimation models are nonlinear Kalman filters and Wiener filter.

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I think that book on this topic from author Alex Becker is great and possibly best introduction into this topic. It has lot of examples and builds requred intuition really well. All I was missing is little more emphasis into mathematical rigor and chapter about LQG regulator, but you can find both of this in original paper by Rudolf Kalman.

raluk

6 месяцев назадdiscuss

It improves immune system and geneal wellbeing. It is pain that you can get used to and I kind of enyoj it now in some weird way. It is hard, requires some dedication and brings some benefits, but does not requre extra time or planning. Great morale booster.

raluk

6 месяцев назадdiscuss

Over the hollidays I was working on Steve Balmers interview puzzle. https://rahne.si/optimisation/2026/01/07/steve-ballmer-inter...

What I am most proud of is that I got the solution in the corse of apporx 1 week working on this!

raluk

6 месяцев назадdiscuss

Using only cold water for showers.

raluk

6 месяцев назадdiscuss

What are protental issues with compiler, by just disabling borrow checker? If I recall correctly some compiler optimisations for rust can not be done in C/C++ because of restrictions implied by borrow checker.

raluk

7 месяцев назадdiscuss

"Math nerd explains how to spend 3 days proving 1+1=2" -> Original "From Zero to QED: An informal introduction to formality with Lean 4" https://news.ycombinator.com/item?id=46259343

raluk

7 месяцев назадdiscuss

Years ago I wrote c++ library for stream compostion. Something like C++20 ranges. It turns out that as long as you compose everything with lambdas, compiled code is same as it would be with naive loops. Everything gets optimised.

For example, you can write sum of numbers less than n as:

  count(uint64_t(0)) 
   | take(n) 
   | sum<uint64_t>();

Clang converted this into n*(n-1)/2.

raluk

9 месяцев назадdiscuss

How much is fft used for AI? Seems that attention and convolution could benefit from this.

raluk

12 месяцев назадdiscuss

This is what i hand in mind whit "manually handing of futures". In this case you have to write

   Promise1 = f1(); Promise2 = f2();
   v1,v2 = await Join(Promise1, Promise2);
   return v1 + v2

I think this is just too much of synthactic noise.

On the other hand, it is necessary becase some of underlying async calls can be order dependend.

for example

    await sock.rec(1) == 'A' && await sock.rec(1) == 'B'

checks that first received socket byte is A and second is B. This is clearly order dependant that can't be executed concurrently out of order.

raluk

12 месяцев назадdiscuss

In there is also ApplicativeDo that works nicely with this.

    do 
      x <- f1
      y <- f2
      return $ x + y

this is evaluated as applicative in same way.

raluk

12 месяцев назадdiscuss

One thing that most languages are lacking is expressing lazy return values. -> await f1() + await f2() and to express this concurently requres manually handing of futures.

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