Talk:CYK algorithm: Difference between revisions

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title changed --- specificity of CYK
Implementing WP:PIQA (Task 26)
 
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{{WikiProject Computerbanner Science|importance=midshell|class=C}}|
{{WikiProject Computer science|importance=mid}}
 
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==I don't like the article==
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Beau Shiel had a nice paper about it at Coling 76. The empty word is a problem that cannot be escaped, if parse-trees are to be preserved, which is implied by the name parser (but sometimes not described with the algorithm). If no parse tree is kept, it is a recognizer.
 
The size of a grammar should be defined explicitly, or a reference given.[[User:Teetooan|Teetooan]] ([[User talk:Teetooan|talk]]) 20:32, 27 February 2014 (UTC)
For building the parse-tree it is always necessary to store a list of nodes with at least one for each non-terminal found.
 
The proper way to write for an encyclopedia is to give the modern and simpler description first. Then to give some historical details such as the use of CNF in the first versions. On the other hand, the CNF is easier to explain. It should be noted that it loses infinite ambiguity.
 
In 1974, Valiant used the Strassen algorithm (1969) to reduce the complexity, but the complexity of matrix multiplication was reduced since then, first by Coppersmith–Winograd (1990), then by Williams (2011). It should be better to discuss usability on the basis of Strassen's algorithm, which is the only one that has a chance of being meaningful. <small><span class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Teetooan|Teetooan]] ([[User talk:Teetooan|talk]] • [[Special:Contributions/Teetooan|contribs]]) 00:45, 26 February 2014 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->
[[User:Teetooan|Teetooan]] ([[User talk:Teetooan|talk]]) 00:49, 26 February 2014 (UTC)
 
It might be nice to underscore that CYK is the only cubic algorithm that can run directly on the grammar (up to the binary transformation, that is both trivial an unescapable).[[User:Teetooan|Teetooan]] ([[User talk:Teetooan|talk]]) 13:09, 26 February 2014 (UTC)
 
Parsing weighted context-free grammars is not specific of CYK and is available in a similar way to all general CF parsers. It is a special case of decorating the rules with values from a semi-ring.[[User:Teetooan|Teetooan]] ([[User talk:Teetooan|talk]]) 20:45, 27 February 2014 (UTC)
 
==Explain practical parse tree generation!==
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== Another article on CYK ==
 
There is another, almost empty article on the CYK parser: http://en.wikipedia.org/wiki/CYK_%28algorithm%29
The two should be merged (the former should be deleted.)
<br><small><span class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:89.133.45.42|89.133.45.42]] ([[User talk:89.133.45.42|talk]] • [[Special:Contributions/89.133.45.42|contribs]]) 21:33, 21 June 2007</span></small><!-- Template:Unsigned -->
 
: Done. [[User:Ceroklis|Ceroklis]] 10:01, 26 September 2007 (UTC)
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:I changed "the most efficient parsing algorithm" to "one of the most efficient parsing algorithms". -- [[User:UKoch|UKoch]] ([[User talk:UKoch|talk]]) 14:08, 20 December 2011 (UTC)
 
 
== External Links ==
 
I tried to fix the broken link in the external links section as well as adding a visualization I published on my site: https://www.xarg.org/tools/cyk-algorithm/
 
Unfortunately, the change was reverted automatically as I got explained here: https://en.wikipedia.org/wiki/User_talk:Xarg
 
However, as I wrote, I don't think this is an advertising other than bringing in a valuable reference to Wikipedia and so I would be glad if you add the link permanently if the resource meeds your quality demands. I assure that this link will be available and that I own the site. <!-- Template:Unsigned --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Xarg|Xarg]] ([[User talk:Xarg#top|talk]] • [[Special:Contributions/Xarg|contribs]]) 03:04, 21 July 2018 (UTC)</small> <!--Autosigned by SineBot-->
 
== Pseudocode Difficult to Read ==
 
Aside from the fact that one-letter variable names obfuscate meaning and are difficult to follow, having a lowercase letter L in a font where it looks nearly identical for the numeral for "one" (cf. l and 1) only compounds the issue. [[User:Antigravity711|Antigravity711]] ([[User talk:Antigravity711|talk]]) 17:06, 27 January 2020 (UTC)