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	<title>De Rerum Natura &#187; parse trees</title>
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	<description>Randomness, entropy, pattern matching, maps, geometry, knots, and scientific readings</description>
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		<title>Precision error for parse trees</title>
		<link>http://www.corrada.com/blog/2008/04/01/precision-error-for-parse-trees/</link>
		<comments>http://www.corrada.com/blog/2008/04/01/precision-error-for-parse-trees/#comments</comments>
		<pubDate>Tue, 01 Apr 2008 05:20:21 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
				<category><![CDATA[Error Theory]]></category>
		<category><![CDATA[Graph Theory]]></category>
		<category><![CDATA[Natural Language Processing]]></category>
		<category><![CDATA[parse trees]]></category>

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		<description><![CDATA[The precision error equations require that &#8220;ground truth&#8221; cancel out. It is easy to see what that means for elevations in a map. What does it mean for parse trees in a natural language processing task like sentence parsing?
One way to define distance between trees is to consider the total number of reverse operations that [...]]]></description>
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