The document summarizes the results of using naive Bayes and complementary naive Bayes classifiers on Japanese text data. The naive Bayes classifier correctly classified around 94% of instances while complementary naive Bayes correctly classified around 72% of instances. Confusion matrices are provided to show the classification breakdown between different categories for each model.

1. (Complementary) Naive Bayes
15
2011/01/23 TokyoWebmining #9-2nd
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2. 2011 1 23

3. naoki yanai @yanaoki
web
Java Ruby Hadoop
TokyoWebmining
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4. - Naive Bayes -
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5. Naive Bayes
,Supervised
Naive Baye ComplementNaiveBayes
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6. 2011 1 23

7. Web
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8. Naive Bayes
F1,...,Fn C
C
c
※ gihyo.jp http://gihyo.jp/dev/serial/01/machine-learning/0002
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9. Naive Bayes
w j i
i
c j θcj
i
※ Wiki http://ibisforest.org/index.php?complement%20naive%20Bayes
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10. Complementaly Naive Bayes
Naive Bayes
Naive Bayes θcj
NaiveBayes c j θcj
CNaiveBayes c j θˆij
※ Wiki http://ibisforest.org/index.php?complement%20naive%20Bayes
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11. - -
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12. API
Mahout
Mahout
Mahout
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13. Mahout
Mahout
CF Clustering
Hadoop
(Classifier)
NaiveBayes ComplementaryNaiveBayes
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14. bayes cbayes
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15. 1.
API API API
mecab
ID[TAB]
c100371 1 !
:
45 45 10 SIZE - 02 : 56 B 76 31 SIZE - 03
: 57 B 82
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16. 2.
bayes|cbayes N-gram N-gram alpha
Bayes/CBayes
35MB EC2 3 15
$ mahout trainclassifier
--gramSize 1
--input /classifier/rakuten/data_search
--output /classifier/rakuten/model_searchcbig
--classifierType cbayes
--dataSource hdfs
--alpha 1
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17. 3.
$ mahout testclassifier
--gramSize 1
--testDir /home/yanaoki/classifier/rakuten/data_rank1
--model /classifier/rakuten/model_searchcbig
--classifierType cbayes
--dataSource hdfs
--alpha 1
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18. 4.
Classify
HBase
export CLASSPATH=...
$ java org.apache.mahout.classifier.Classify
--path /home/yanaoki/classifier/rakuten/model
--classify /home/yanaoki/classifier/rakuten/d.doc
--encoding UTF-8
--gramSize 1
--classifierType cbayes
--dataSource hdfs
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19. 4.
Classify
HBase
export CLASSPATH=...
$ java org.apache.mahout.classifier.Classify
--path /home/yanaoki/classifier/rakuten/model
--classify /home/yanaoki/classifier/rakuten/d.doc
--encoding UTF-8
--gramSize 1
--classifierType cbayes
--dataSource hdfs
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20. 2011 1 23

21. ID
100005 DIY 2997 4.8M
100227 2994 3.9M
100371 3000 4.6M
100939 2990 4.7M
101114 2997 3.3M
101381 2905 4.2M
200162 2997 2.6M
216131 2999 3.4M
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22. bayes
=======================================================
Summary
-------------------------------------------------------
Correctly Classified Instances : 22442 93.9822%
Incorrectly Classified Instances : 1437 6.0178%
Total Classified Instances : 23879
=======================================================
Confusion Matrix
-------------------------------------------------------
a b c d e f g h <--Classified as
2802 0 127 3 8 19 4 27 | 2990 a = c100939
0 2982 2 0 0 0 0 13 | 2997 b = c200162
0 7 2948 34 0 1 0 9 | 2999 c = c216131
1 0 133 2846 0 1 0 19 | 3000 d = c100371
233 2 53 0 2434 13 0 259 | 2994 e = c100227
20 0 15 0 0 2935 3 24 | 2997 f = c101114
0 0 39 0 1 139 2753 65 | 2997 g = c100005
0 6 125 4 1 26 1 2742 | 2905 h = c101381
Default Category: unknown: 8
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23. bayes
=======================================================
Summary
-------------------------------------------------------
Correctly Classified Instances : 22442 93.9822%
Incorrectly Classified Instances : 1437 6.0178%
Total Classified Instances : 23879
=======================================================
Confusion Matrix
-------------------------------------------------------
a b c d e f g h <--Classified as
2802 0 127 3 8 19 4 27 | 2990 a = c100939
0 2982 2 0 0 0 0 13 | 2997 b = c200162
0 7 2948 34 0 1 0 9 | 2999 c = c216131
1 0 133 2846 0 1 0 19 | 3000 d = c100371
233 2 53 0 2434 13 0 259 | 2994 e = c100227
20 0 15 0 0 2935 3 24 | 2997 f = c101114
0 0 39 0 1 139 2753 65 | 2997 g = c100005
0 6 125 4 1 26 1 2742 | 2905 h = c101381
Default Category: unknown: 8
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24. ID
100005 DIY 5997 9.0M
100227 5969 7.1M
100371 3000 4.6M
100939 2990 4.7M
101114 1500 2.4M
101381 1500 1.5M
200162 500 0.48M
216131 500 0.45M
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25. bayes
=======================================================
Summary
-------------------------------------------------------
Correctly Classified Instances : 14459 60.5511%
Incorrectly Classified Instances : 9420 39.4489%
Total Classified Instances : 23879
=======================================================
Confusion Matrix
-------------------------------------------------------
a b c d e f g h <--Classified as
1945 0 0 5 799 0 241 0 | 2990 a = c100939
11 0 0 0 349 0 2632 5 | 2997 b = c200162
6 0 0 833 82 0 2078 0 | 2999 c = c216131
0 0 0 2925 13 0 62 0 | 3000 d = c100371
0 0 0 0 2993 0 1 0 | 2994 e = c100227
3 0 0 0 86 2479 429 0 | 2997 f = c101114
0 0 0 0 39 0 2958 0 | 2997 g = c100005
0 0 1 8 800 2 935 1159 | 2905 h = c101381
Default Category: unknown: 8
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26. complement naive bayes
=======================================================
Summary
-------------------------------------------------------
Correctly Classified Instances : 17225 72.1345%
Incorrectly Classified Instances : 6654 27.8655%
Total Classified Instances : 23879
=======================================================
Confusion Matrix
-------------------------------------------------------
a b c d e f g h <--Classified as
2249 0 0 5 588 0 148 0 | 2990 a = c100939
10 1806 0 3 370 0 808 0 | 2997 b = c200162
2 0 471 1084 252 0 1190 0 | 2999 c = c216131
0 0 0 2985 4 0 11 0 | 3000 d = c100371
0 0 0 0 2994 0 0 0 | 2994 e = c100227
27 0 0 1 69 2422 478 0 | 2997 f = c101114
0 0 0 0 33 0 2964 0 | 2997 g = c100005
1 0 0 30 910 0 630 1334 | 2905 h = c101381
Default Category: unknown: 8
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27. API
complement naive
bayes
Mahout
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28. 2011 1 23