<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Hacker News: robertsdionne</title><link>https://news.ycombinator.com/user?id=robertsdionne</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Sat, 25 Apr 2026 19:13:39 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=robertsdionne" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by robertsdionne in "Abusing DuckDB-WASM by making SQL draw 3D graphics (Sort Of)"]]></title><description><![CDATA[
<p><a href="https://x.com/geocucu_t/status/1909291486367166717" rel="nofollow">https://x.com/geocucu_t/status/1909291486367166717</a></p>
]]></description><pubDate>Tue, 22 Apr 2025 16:19:01 +0000</pubDate><link>https://news.ycombinator.com/item?id=43763816</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=43763816</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43763816</guid></item><item><title><![CDATA[New comment by robertsdionne in "Tiny Pointers"]]></title><description><![CDATA[
<p>After reading more, it seems the novelty is in the two specific schemes that use these techniques to store data with high probability into tables of extremely high load factors with bounded pointer sizes, which are more complex than simple array indices due to having to resolve which fallback table is storing the key-value pair.<p>One scheme proves tiny pointer size bounds for fixed length tiny pointers. The other proves bounds for variable length pointers.</p>
]]></description><pubDate>Wed, 12 Feb 2025 19:40:55 +0000</pubDate><link>https://news.ycombinator.com/item?id=43028957</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=43028957</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43028957</guid></item><item><title><![CDATA[New comment by robertsdionne in "Tiny Pointers"]]></title><description><![CDATA[
<p>How is this novel?<p>This is like using a fixed sharding scheme plus delta-compression for indices relative to shard addresses plus varint encoding the deltas.</p>
]]></description><pubDate>Wed, 12 Feb 2025 19:29:29 +0000</pubDate><link>https://news.ycombinator.com/item?id=43028847</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=43028847</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43028847</guid></item><item><title><![CDATA[New comment by robertsdionne in "Differential Transformer"]]></title><description><![CDATA[
<p>It means one of these things: <a href="https://en.wikipedia.org/wiki/Simplex#Standard_simplex" rel="nofollow">https://en.wikipedia.org/wiki/Simplex#Standard_simplex</a></p>
]]></description><pubDate>Tue, 08 Oct 2024 17:44:37 +0000</pubDate><link>https://news.ycombinator.com/item?id=41779880</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=41779880</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=41779880</guid></item><item><title><![CDATA[New comment by robertsdionne in "Were RNNs all we needed?"]]></title><description><![CDATA[
<p>These are real RNNs, they still depend upon the prior hidden state, it’s just that the gating does not. The basic RNN equation can be parallelized with parallel prefix scan algorithms.</p>
]]></description><pubDate>Thu, 03 Oct 2024 21:19:14 +0000</pubDate><link>https://news.ycombinator.com/item?id=41735113</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=41735113</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=41735113</guid></item><item><title><![CDATA[New comment by robertsdionne in "Trump injured but ‘fine’ after attempted assassination at rally"]]></title><description><![CDATA[
<p>I think I hear in this video: <a href="https://twitter.com/JordanUhl/status/1812251693888975359" rel="nofollow">https://twitter.com/JordanUhl/status/1812251693888975359</a><p>"Take a look at what happened", then three initial shots, "Get down! Get down! Get down!", followed by four rapid shots, all likely from the shooter. Trump ducks after the third initial shot. They sound like "crack---boom" where the "crack" is the bullet passing the microphone and the "boom" is the gunfire arriving later due to speed of sound at distance from the shooter.<p>Immediately after, there is a three-round burst of automatic fire, then several seconds later there is a single silenced shot ("kill confirmed") all likely secret service.<p>I'd have to look at the audio waveform to distinguish whether the four rapid shots were the same shooter or return fire from secret service.<p>Edit: After watching this: <a href="https://twitter.com/BNONews/status/1812327502028669328" rel="nofollow">https://twitter.com/BNONews/status/1812327502028669328</a><p>It seems like the first 3 and then next 5 (not 4) shots were from the shooter, and there was a single sniper shot returned by secret service immediately after (some echo made it sound like a 3 round burst in the first video), with the final follow up confirmation shot several seconds later.</p>
]]></description><pubDate>Sun, 14 Jul 2024 01:56:45 +0000</pubDate><link>https://news.ycombinator.com/item?id=40958299</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40958299</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40958299</guid></item><item><title><![CDATA[New comment by robertsdionne in "Training of Physical Neural Networks"]]></title><description><![CDATA[
<p>This is “Mortal Computation” coined in Hinton’s The Forward-Forward Algorithm: Some Preliminary Investigations <a href="https://arxiv.org/abs/2212.13345" rel="nofollow">https://arxiv.org/abs/2212.13345</a>.</p>
]]></description><pubDate>Wed, 10 Jul 2024 21:43:39 +0000</pubDate><link>https://news.ycombinator.com/item?id=40931829</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40931829</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40931829</guid></item><item><title><![CDATA[New comment by robertsdionne in "Ask HN: What is the best code base you ever worked on?"]]></title><description><![CDATA[
<p>* <a href="https://abseil.io/resources/swe-book/html/ch16.html" rel="nofollow">https://abseil.io/resources/swe-book/html/ch16.html</a><p>* <a href="https://abseil.io/resources/swe-book/html/ch17.html" rel="nofollow">https://abseil.io/resources/swe-book/html/ch17.html</a></p>
]]></description><pubDate>Fri, 28 Jun 2024 18:53:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=40823842</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40823842</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40823842</guid></item><item><title><![CDATA[New comment by robertsdionne in "Ask HN: What is the best code base you ever worked on?"]]></title><description><![CDATA[
<p>Cannot overstate.</p>
]]></description><pubDate>Fri, 28 Jun 2024 18:49:32 +0000</pubDate><link>https://news.ycombinator.com/item?id=40823788</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40823788</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40823788</guid></item><item><title><![CDATA[New comment by robertsdionne in "Super Heavy has splashed down in The Gulf of Mexico"]]></title><description><![CDATA[
<p>You are not riding the atmosphere down, the atmosphere is riding you.</p>
]]></description><pubDate>Thu, 06 Jun 2024 20:54:54 +0000</pubDate><link>https://news.ycombinator.com/item?id=40602290</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40602290</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40602290</guid></item><item><title><![CDATA[New comment by robertsdionne in "Sphere Rendering: Flat Planets"]]></title><description><![CDATA[
<p>Love the gas giant and the corresponding page: <a href="https://emildziewanowski.com/flowfields/" rel="nofollow">https://emildziewanowski.com/flowfields/</a></p>
]]></description><pubDate>Wed, 05 Jun 2024 00:02:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=40580149</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40580149</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40580149</guid></item><item><title><![CDATA[New comment by robertsdionne in "Sphere Rendering: Flat Planets"]]></title><description><![CDATA[
<p><a href="https://en.wikipedia.org/wiki/Peirce_quincuncial_projection" rel="nofollow">https://en.wikipedia.org/wiki/Peirce_quincuncial_projection</a></p>
]]></description><pubDate>Tue, 04 Jun 2024 23:47:56 +0000</pubDate><link>https://news.ycombinator.com/item?id=40580079</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=40580079</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=40580079</guid></item><item><title><![CDATA[New comment by robertsdionne in "Prolly Trees"]]></title><description><![CDATA[
<p>Also the rolling hash is only on map keys, so replacing fixed-size values requires no splits.</p>
]]></description><pubDate>Sat, 09 Mar 2024 17:17:07 +0000</pubDate><link>https://news.ycombinator.com/item?id=39653109</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=39653109</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=39653109</guid></item><item><title><![CDATA[New comment by robertsdionne in "Motion blur all the way down (2022)"]]></title><description><![CDATA[
<p>I think the best implementation (without eye-tracking) would not motion-blur the entire scene when the player moves themselves (ego-motion-blur) but would blur moving objects. However, if the player's view motion happens to coincide with the motion of objects in the scene, for instance if the player is tracking the object (maybe another player so they can shoot it in an FPS) then the object-motion-blur should be reduced according to the degree of tracking. I'm sure some game engines already do this.</p>
]]></description><pubDate>Mon, 04 Mar 2024 18:16:20 +0000</pubDate><link>https://news.ycombinator.com/item?id=39593854</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=39593854</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=39593854</guid></item><item><title><![CDATA[New comment by robertsdionne in "Motion blur all the way down (2022)"]]></title><description><![CDATA[
<p>The point is that ego-motion-blur is dumb. (It can also make players motion-sick.)<p>You say it yourself: "your brain compensates for saccades by censoring input for a while. And it has built-in motion stabilization which allows you to read a sign while walking down the street."</p>
]]></description><pubDate>Mon, 04 Mar 2024 18:01:55 +0000</pubDate><link>https://news.ycombinator.com/item?id=39593673</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=39593673</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=39593673</guid></item><item><title><![CDATA[New comment by robertsdionne in "Sieve is simpler than LRU"]]></title><description><![CDATA[
<p>I wonder about allowing the hand to 1-D random walk left or right when examining the visited bit for evicting an item.</p>
]]></description><pubDate>Tue, 09 Jan 2024 23:26:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=38933827</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=38933827</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=38933827</guid></item><item><title><![CDATA[New comment by robertsdionne in "What is the index of an empty string in an empty string?"]]></title><description><![CDATA[
<p>The string of all strings that don’t contain themselves as substrings.</p>
]]></description><pubDate>Thu, 14 Dec 2023 19:07:18 +0000</pubDate><link>https://news.ycombinator.com/item?id=38645693</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=38645693</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=38645693</guid></item><item><title><![CDATA[New comment by robertsdionne in "Show HN: Visualize rotating objects from the 4th, 5th, nth dimensions"]]></title><description><![CDATA[
<p>Related, but still 3D, these are non-euclidean 3d geometries: <a href="https://3-dimensional.space/" rel="nofollow noreferrer">https://3-dimensional.space/</a><p>I like the S3 geometry, which is essentially floating around on the 3d-surface of a 4d ball, also described here: <a href="https://www.mathinees-lacaniennes.net/images/stories/articles/dante.pdf" rel="nofollow noreferrer">https://www.mathinees-lacaniennes.net/images/stories/article...</a></p>
]]></description><pubDate>Wed, 13 Dec 2023 07:51:35 +0000</pubDate><link>https://news.ycombinator.com/item?id=38623962</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=38623962</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=38623962</guid></item><item><title><![CDATA[New comment by robertsdionne in "AI system self-organises to develop features of brains of complex organisms"]]></title><description><![CDATA[
<p><a href="https://x.com/tegmark/status/1658438666182688768?s=46" rel="nofollow noreferrer">https://x.com/tegmark/status/1658438666182688768?s=46</a></p>
]]></description><pubDate>Fri, 24 Nov 2023 13:23:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=38403716</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=38403716</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=38403716</guid></item><item><title><![CDATA[New comment by robertsdionne in "Non-Euclidean Geometry Online: A Guide to Resources (2008)"]]></title><description><![CDATA[
<p>related resource: <a href="https://www.3-dimensional.space/" rel="nofollow noreferrer">https://www.3-dimensional.space/</a></p>
]]></description><pubDate>Mon, 21 Aug 2023 01:10:23 +0000</pubDate><link>https://news.ycombinator.com/item?id=37204420</link><dc:creator>robertsdionne</dc:creator><comments>https://news.ycombinator.com/item?id=37204420</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=37204420</guid></item></channel></rss>