Cuckoo Hashing - Radium Software
ãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ルã‹ã‚‰ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã‚’検索ã™ã‚‹å‡¦ç†ã¯ï¼Œä¸€èˆ¬ã«å®šæ•°æ™‚é–“ã§æ¸ˆã‚€ã¨ã•ã‚Œã¦ã„る。ã¤ã¾ã‚Šï¼Œã©ã‚“ãªã«ã‚¨ãƒ³ãƒˆãƒªãƒ¼ãŒå¢—ãˆã¦ã‚‚検索ã®é€Ÿã•ã¯å¤‰ã‚らãªã„，ã¨ã„ã†ã“ã¨ã€‚ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã®æ•™ç§‘書ã«ã¯å¿…ãšè¼‰ã£ã¦ã„ã‚‹ã“ã¨ã ã。 ã§ã‚‚実際ã«ã¯ï¼Œãƒãƒƒã‚·ãƒ¥ã®è¡çªãŒèµ·ã“ã£ãŸå ´åˆã«ï¼Œé€Ÿåº¦ã®ä½Žä¸‹ãŒç™ºç”Ÿã™ã‚‹å¯èƒ½æ€§ãŒã‚る。例ãˆã°ï¼Œä¸€èˆ¬çš„ãªãƒã‚§ã‚¤ãƒ³æ³•ï¼ˆã‚ªãƒ¼ãƒ—ンãƒãƒƒã‚·ãƒ¥ï¼‰ã ã¨ï¼Œè¡çªã—ãŸã‚¨ãƒ³ãƒˆãƒªãƒ¼ã«é–¢ã—ã¦ç·šå½¢æ¤œç´¢ã‚’è¡Œã†ã“ã¨ã«ãªã‚‹ã‹ã‚‰ï¼Œè¡çªãŒå¤šã‘ã‚Œã°å¤šã„ã»ã©ï¼Œå®šæ•°æ™‚é–“ã‹ã‚‰ã¯é ã®ã„ã¦ã—ã¾ã†ã€‚ ã“ã®é€Ÿåº¦ä½Žä¸‹ã‚’防ã方法ã¯ã„ã‚ã„ã‚ã‚る。ãªã‹ã§ã‚‚ cuckoo hashing （カッコウ・ãƒãƒƒã‚·ãƒ³ã‚°ï¼‰ã¯ä»•çµ„ã¿ãŒé¢ç™½ã„。ã“ã„ã¤ã¯ï¼Œã‚¨ãƒ³ãƒˆãƒªãƒ¼ã®æ¤œç´¢ã‚’å¿…ãšå®šæ•°æ™‚é–“ã§æ¸ˆã¾ã›ã¦ãれるã¨ã„ã†å„ªã‚Œã‚‚ã®ãªã‚“ã 。 Cuckoo hashing ã§ã¯ï¼Œï¼’ã¤ã®ãƒãƒƒã‚·ãƒ¥é–¢æ•°ã¨ï¼Œï¼’ã¤ã®ãƒ†ãƒ¼ãƒ–ルを用ã„る。ã“ã“ã§ã¯ï¼Œï¼’ã¤ã®ãƒãƒƒã‚·ãƒ¥é–¢æ•°ã‚’ãã‚Œãžã‚Œ h1, h2 ã¨ã—ã¦ï¼Œï¼’ã¤ã®ãƒ†ãƒ¼
An Introduction to Hashing in the Era of Machine Learning
In December 2017, researchers at Google and MIT published a provocative research paper about their efforts into “learned index structuresâ€. The research is quite exciting, as the authors state in the abstract: “[…] we believe that the idea of replacing core components of a data management system through learned models has far reaching implications for future systems designs and that this work just
Minimal Perfect Hash-Tables in Common Lisp
Recently, my twitter pal @ifesdjeen wrote a line that resonated with me: "Looks like it's easier for people to read 40 blog posts than a single whitepaper." And although he used it in a negative context, I recognized it as a very precise (and, actually, positive) description of what a research engineer does: read a whitepaper (or a dozen, for what it's worth) and transform it into working code and
ç§ãŒæ›¸ã„ãŸæœ€é€Ÿã®ãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ル – PART 1 | POSTD
çµå±€ã€ã‚„り出ã—ãŸã‚‰æ¢ã¾ã‚Šã¾ã›ã‚“。ç§ã¯ä»¥å‰ã€â€ I Wrote a Fast Hashtable（ç§ãŒæ›¸ã„ãŸé«˜é€Ÿãªãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ル） “ã¨ã„ã†è¨˜äº‹ã¨ã€ãã‚Œã«æ¬¡ã„ã§â€ I Wrote a Faster Hashtable（ç§ãŒæ›¸ã„ãŸã‚ˆã‚Šé«˜é€Ÿãªãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ル） “ã¨ã„ã†è¨˜äº‹ã‚’ブãƒã‚°ã«ã‚¢ãƒƒãƒ—ã—ã¾ã—ãŸãŒã€ä»Šå›žã¤ã„ã«ã€æœ€é€Ÿã®ãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ルを書ã上ã’ã¾ã—ãŸã€‚ã“ã‚ŒãŒæ„味ã™ã‚‹ã¨ã“ã‚ã¯ã€ãƒ«ãƒƒã‚¯ã‚¢ãƒƒãƒ—ãŒã©ã®ãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ルよりも速ã„ã¨ã„ã†ã“ã¨ã§ã™ã€‚ãã‚Œã«åŠ ãˆã¦ã€æŒ¿å…¥ã‚„削除も（最速ã¨ã¾ã§ã¯ã„ã‹ãªã„ã¾ã§ã‚‚）éžå¸¸ã«é€Ÿãè¡Œãˆã¾ã™ã€‚ 秘訣ã¯ã€æŽ¢ç´¢å›žæ•°ã®ä¸Šé™ã‚’è¨å®šã—ãŸãƒãƒ“ンフッドãƒãƒƒã‚·ãƒ¥æ³•ã‚’使用ã™ã‚‹ã“ã¨ã§ã™ã€‚ã‚ã‚‹è¦ç´ ãŒã€ãã®ç†æƒ³çš„ãªä½ç½®ã‹ã‚‰X数以上ã€é›¢ã‚ŒãŸä½ç½®ã«ã‚ã‚‹å ´åˆã€ãƒ†ãƒ¼ãƒ–ルを拡張ã™ã‚‹ã“ã¨ã§ã€å…¨ã¦ã®è¦ç´ ãŒã€ãã®å¤§ããªãƒ†ãƒ¼ãƒ–ル内ã«ãŠã„ã¦ã€ç†æƒ³çš„ãªä½ç½®ã«è¿‘ã¥ãよã†ã«ã—ã¾ã™ã€‚çµæžœçš„ã«ã€ã“ã®ã‚„ã‚Šæ–¹ã¯éžå¸¸ã«ã†ã¾ãã„ãã¾ã—ãŸã€‚
I Wrote The Fastest Hashtable
I had to get there eventually. I had a blog post called “I Wrote a Fast Hashtable†and another blog post called “I Wrote a Faster Hashtable.†Now I finally wrote the fastest hashtable. And by that I mean that I have the fastest lookups of any hashtable I could find, while my inserts and erases are also really fast. (but not the fastest) The trick is to use Robin Hood hashing with an upper limit on
âš™ D27155 Merge strings using concurrent hash map (3rd try!)
Here is yet another different implementation of string merging algorithm. And this is faster than the previous two (https://reviews.llvm.org/D27146, https://reviews.llvm.org/D27152). ParallelStringTableBuilder implemented in this patch is a concurrent hash table specialized for string table creation. It doesn't support resizing, and you cannot do anything other than inserting strings into the buil
Klib — a generic library in C
{ "tiddlers": { "$:/Acknowledgements": { "title": "$:/Acknowledgements", "type": "text/vnd.tiddlywiki", "text": "TiddlyWiki incorporates code from these fine OpenSource projects:\n\n* [[The Stanford Javascript Crypto Library|http://bitwiseshiftleft.github.io/sjcl/]]\n* [[The Jasmine JavaScript Test Framework|http://pivotal.github.io/jasmine/]]\n* [[Normalize.css by Nicolas Gallagher|http://necolas
Hash Functions and Block Ciphers
I have a lot of material related to hashing. Definitions and my offerings: Hash functions for hash table lookup Error Correction Codes Noncryptographic Checksums A noncryptographic hardware hash One-way functions (cryptographic hash functions, digital signatures) Block Ciphers Random Number Generators Stream Ciphers My functions: LOOKUP3.C, for hash table lookup SpookyHash, for hash table lookup a
Home page, Bob Jenkins
Looks like Trump got elected to a second term. It's like we're in a horror movie, and we all spent the opening scenes yelling "Don't go near the caaaastle!!!", and we just went in the castle anyhow and the door shut behind us. Time to sit back and eat some popcorn and watch how this unfolds. I'm surprised Gaetz got rejected. I mean, something still actually matters? How to become rich slowly: open
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GitHub - ronomon/hash-table: Fast, reliable cuckoo hash table for Node.js.
Will .hashcode() return a different int due to compaction of tenure space?
Efficient Hash Tables on the GPU
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