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From Andi Vajda <>
Subject Re: Indexing Non-Textual Data
Date Wed, 06 Apr 2011 22:11:22 GMT


On Wed, 6 Apr 2011, Chris Spencer wrote:

> I'm new to PyLucene, so forgive me if this is a newbie question. I have a
> dataset composed of several thousand lists of 128 integer features, each
> list associated with a class label. Would it be possible to use Lucene as a
> classifier, by indexing the label with respect to these integer features,
> and then classify a new list by finding the most similar labels with Lucene?

I believe there is support in Lucene for indexing numeric values using a 
Trie. Please ask on (subscribe first by sending 
mail to There are many more Lucene 
experts with answers there.

For example, this class may be relevant:


> I've been going through the PyLucene samples, but they only seem to involve
> indexing text, not continuous features (understandably). Could anyone point
> me to an example that indexes non-textual data?
> I think the project Lire ( is using
> Lucene to do something similar to this, although with an emphasis on image
> features. I've dug into their code a little, but I'm not a strong Java
> programmer, so I'm not sure how they're pulling it off, nor how I might
> translate this into the PyLucene API. In your opinion, is this a practical
> use of Lucene?
> Regards,
> Chris

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