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Clustering & Classify sparse large features

asked 2013-07-29 02:21:47 -0500

My problem initial features are x , y ,theta that normalized in range[0,255].

For each object number of features is variable.

Clustering is applied so each cluster has number of features & each object belongs to multiple clusters. In the predict stage ,compute clusters for each object from initial features(new features).

Each object belongs to a maximum of 10 clusters.

Total number of clusters is 4000.

If we consider new features constant for each object we have 4000 dimension that it very large for classify.Only 10 features may be useful and my features is sparse.

My question :

Is there any way that we can classify these sparse features with best performance & which classifier is useful for it? Note:I use locality sensitive hashing for classify new features with 4000 dimension that is very slow.

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answered 2013-07-29 03:00:10 -0500

I guess you have to look at dimensionality reduction of your problem, which is done in techniques like Fishers Linear Descriminant Analysis or Principal Component Analysis. They will help you discover the most influencing dimensions in your data, dimensions you wouldn't even notice at first sight.

Good examples that use these techniques are Fisherfaces and Eigenfaces. Have a look at it!

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Thanks.I used pca for reduce dimension of features & use svm for classification then solved my problem.

Mostafa Sataki gravatar imageMostafa Sataki ( 2013-07-29 06:24:05 -0500 )edit
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Asked: 2013-07-29 02:21:47 -0500

Seen: 186 times

Last updated: Jul 29 '13