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| <label class="menu-button float-right" for=menu-toggle><i class="fa fa-bars fa-fw" aria-hidden=true></i></label><ul class=navigation-list><li class=navigation-item><a class=navigation-link href=/about/>About</a></li><li class=navigation-item><a class=navigation-link href=/posts/>Blog</a></li><li class=navigation-item><a class=navigation-link href=/projects/>Projects</a></li><li class=navigation-item><a class=navigation-link href=/contact/>Contact me</a></li></ul></section></nav><div class=content><section class="container page"><article><header><h1 class=title><a class=title-link href=https://n1o.github.io/about/></a></h1></header><h1 id=about>About | ||
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| <span class=sr-only>Link to heading</span></a></h1><p>I’m Marek Barak, I started my journey into computer science when I was 15 and started to code in C++. Since then more than 15 years has passed, and I managed to get an Master degree in computer science and statistics from the University of Economics in Bratislava. I had to opportunity to do data science consulting, work for multiple startups in their various stages.</p><p>My professional interests are:</p><ul><li>Machine Learning</li><li>High performance and distributed computing</li><li>Reverse Engineering and Vunerability Exploitation</li></ul><p>As of my personal life, I am a father of three sons, cat person and a book worm committed to life long geek-hood.</p></article></section><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css integrity=sha384-vKruj+a13U8yHIkAyGgK1J3ArTLzrFGBbBc0tDp4ad/EyewESeXE/Iv67Aj8gKZ0 crossorigin=anonymous><script defer src=https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js integrity=sha384-PwRUT/YqbnEjkZO0zZxNqcxACrXe+j766U2amXcgMg5457rve2Y7I6ZJSm2A0mS4 crossorigin=anonymous></script><script defer src=https://cdn.jsdelivr.net/npm/[email protected]/dist/contrib/auto-render.min.js integrity=sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05 crossorigin=anonymous onload='renderMathInElement(document.body,{delimiters:[{left:"$$",right:"$$",display:!0},{left:"$",right:"$",display:!1},{left:"\\(",right:"\\)",display:!1},{left:"\\[",right:"\\]",display:!0}]})'></script></div><footer class=footer><section class=container>© | ||
| <span class=sr-only>Link to heading</span></a></h1><p>I’m Marek Barak, I started my journey into computer science when I was 15 by coding in C++, without having access to the internet and in good old fashioned <a href=https://www.bloodshed.net/>Bloodshed C++</a> Since then more than 15 years has passed, and I managed to get an Master degree in computer science and statistics from the University of Economics in Bratislava. I had to opportunity to do build machine learning and distributed systems for early to mid sage startups. Currently my day job is at <a href=https://paiqo.com/>Paiqo</a> tackling anything Data related. At nights I am an independent Cyber Security Researcher figuring out how to apply Machine Learning to Cyber Security especially in the field of Reverse Engineering and Vulnerability Exploitation.</p><p>My professional interests are:</p><ul><li>Machine Learning</li><li>High performance and distributed computing</li><li>Reverse Engineering and Vulnerability Exploitation</li><li>Secure Coding</li></ul><p>As of my personal life, I am married (Still fiding it hard to figure out why she said yes!). I am also an father of three sons, cat person and a book worm committed to life long geek-hood.</p></article></section><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css integrity=sha384-vKruj+a13U8yHIkAyGgK1J3ArTLzrFGBbBc0tDp4ad/EyewESeXE/Iv67Aj8gKZ0 crossorigin=anonymous><script defer src=https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js integrity=sha384-PwRUT/YqbnEjkZO0zZxNqcxACrXe+j766U2amXcgMg5457rve2Y7I6ZJSm2A0mS4 crossorigin=anonymous></script><script defer src=https://cdn.jsdelivr.net/npm/[email protected]/dist/contrib/auto-render.min.js integrity=sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05 crossorigin=anonymous onload='renderMathInElement(document.body,{delimiters:[{left:"$$",right:"$$",display:!0},{left:"$",right:"$",display:!1},{left:"\\(",right:"\\)",display:!1},{left:"\\[",right:"\\]",display:!0}]})'></script></div><footer class=footer><section class=container>© | ||
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@@ -5,4 +5,4 @@ If I perform a hypothetical sequence of interventions how will my time series ev | |
| An example and some details Link to heading Example Link to heading As a medical doctor in a hospital, if a patient has a high fever and is at risk of dying, a common practice is to measure their levels of C-reactive protein (CRP) to determine if they need antibiotics.</description></item><item><title>Hierarchical Probabilistic Matrix Factorization</title><link>https://n1o.github.io/posts/pooled_matrix_factorization/</link><pubDate>Thu, 17 Dec 2020 10:19:42 +0100</pubDate><guid>https://n1o.github.io/posts/pooled_matrix_factorization/</guid><description>Probabilistic Matrix factorization is a simple but useful model for matrix imputation. The main idea is to decompose a tall and wide matrix into a product of two matrices, one tall and thin and one short and wide. | ||
| $$ R_{n\times m} = U_{m \times d} \cdot V_{d \times n} $$ | ||
| If you are a Bayesian, you can express this model as: | ||
| $$ R_{ij} \sim \mathcal{N}(u_i \cdot v_j^T, \sigma) $$ $$ u_i \sim \mathcal{N}(\mu_u, \Sigma_u) $$ $$ v_j \sim \mathcal{N}(\mu_v, \Sigma_v) $$</description></item><item><title/><link>https://n1o.github.io/about/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/about/</guid><description>About Link to heading I&rsquo;m Marek Barak, I started my journey into computer science when I was 15 and started to code in C++. Since then more than 15 years has passed, and I managed to get an Master degree in computer science and statistics from the University of Economics in Bratislava. I had to opportunity to do data science consulting, work for multiple startups in their various stages.</description></item><item><title/><link>https://n1o.github.io/contact/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/contact/</guid><description>Contact Link to heading Feel free to contact me via email [email protected] or socials.</description></item><item><title/><link>https://n1o.github.io/projects/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/projects/</guid><description>Projects Link to heading Study notes Link to heading This is my compilation of notes from various subjects. This is work in progress, where I continuously migrate, rewrite, simplify the notes I have. During the years I wrote thousands of pages worth of notes, not always concise. Right now I prefer taking notes that are somewhat similar to the Zettelkasten method. Thus keeping them short, easy to follow, covering at most a single subject.</description></item></channel></rss> | ||
| $$ R_{ij} \sim \mathcal{N}(u_i \cdot v_j^T, \sigma) $$ $$ u_i \sim \mathcal{N}(\mu_u, \Sigma_u) $$ $$ v_j \sim \mathcal{N}(\mu_v, \Sigma_v) $$</description></item><item><title/><link>https://n1o.github.io/about/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/about/</guid><description>About Link to heading I&rsquo;m Marek Barak, I started my journey into computer science when I was 15 by coding in C++, without having access to the internet and in good old fashioned Bloodshed C++ Since then more than 15 years has passed, and I managed to get an Master degree in computer science and statistics from the University of Economics in Bratislava. I had to opportunity to do build machine learning and distributed systems for early to mid sage startups.</description></item><item><title/><link>https://n1o.github.io/contact/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/contact/</guid><description>Contact Link to heading Feel free to contact me via email [email protected] or socials.</description></item><item><title/><link>https://n1o.github.io/projects/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://n1o.github.io/projects/</guid><description>Projects Link to heading Study notes Link to heading This is my compilation of notes from various subjects. This is work in progress, where I continuously migrate, rewrite, simplify the notes I have. During the years I wrote thousands of pages worth of notes, not always concise. Right now I prefer taking notes that are somewhat similar to the Zettelkasten method. Thus keeping them short, easy to follow, covering at most a single subject.</description></item></channel></rss> | ||
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