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List:       wekalist
Subject:    Re: [Wekalist] pca and heap memory error
From:       <rich () thevillas ! eclipse ! co ! uk>
Date:       2006-12-22 11:55:15
Message-ID: 20061222115519.16E09C1309 () mra04 ! ch ! as12513 ! net
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<p><br /><br /> <br /><br /><strong>On Thu Dec 21 19:17 , Peter Reutemann  sent:<br \
/><br /></strong><blockquote style="border-left: 2px solid rgb(245, 245, 245); \
margin-left: 5px; margin-right: 0px; padding-left: 5px; padding-right: 0px;">&gt; i \
have a dataset of 126 attributes and 2000 instances. I can run svm SMO on this <br /> \
&gt; without a problem.<br /> &gt; <br />
&gt; When i perform PCA and reduce the dataset to dimensions of 20x2000 i error heap \
<br /> &gt; memroy errors.<br />
&gt; <br />
&gt; I know how to resolve, that's not a problem.<br />
&gt; <br />
&gt; It just seems slightly odd that with 126 attributes it's not a problem yet with \
<br /> &gt; 20 is it.<br />
<br />
Are you running this from the Explorer? </blockquote></p><blockquote \
style="border-left: 2px solid rgb(245, 245, 245); margin-left: 5px; margin-right: \
0px; padding-left: 5px; padding-right: \
0px;"></blockquote><p>&nbsp;yes</p><p><blockquote style="border-left: 2px solid \
rgb(245, 245, 245); margin-left: 5px; margin-right: 0px; padding-left: 5px; \
padding-right: 0px;">If yes, did you save the <br /> PCA-transformed data, restart \
Weka and try it again with SMO? </blockquote></p><p>&nbsp;yes</p><p><blockquote \
style="border-left: 2px solid rgb(245, 245, 245); margin-left: 5px; margin-right: \
0px; padding-left: 5px; padding-right: 0px;">Or was <br /> that AFTER you ran SMO and \
PCA, that you tried the transformed data with <br /> SMO again? In the latter case, \
all the results of the previous runs are <br /> still in memory, which wouldn't \
surprise me, if you'd run into memory <br /> problems.</blockquote></p><p>&nbsp;no, i \
actually created from the command line and then started explorer and ran \
svm.</p><p>Seems strange but doesn't matter too much I \
guess</p><p>Thanks</p><p>Rich&nbsp;</p><p><blockquote style="border-left: 2px solid \
rgb(245, 245, 245); margin-left: 5px; margin-right: 0px; padding-left: 5px; \
padding-right: 0px;"><br /> <br />
HTH<br />
<br />
Cheers, Peter<br />
-- <br />
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ<br />
<a target="_blank" href="parse.pl?redirect=http%3A%2F%2Fwww.cs.waikato.ac.nz%2F%7Efracpete%2F">http://www.cs.waikato.ac.nz/~fracpete/</a> \
Ph. +64 (7) 858-5174<br /> <br />
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