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"how to calculate the distance between two text documents?"

Hi,

Suppose here are two text documents, d1 and d2. I could build two vectors and read them by Iterator<Example>. Then, how to calculate the distance or similarity between them? For example, the cosine distance. Is there any operator or function provided by RM?

Thank you very much.

Sincerely yours,
gfyang

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AI Studio

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Text Mining + NLP

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fischer

Hi,

yes. Please look into com.rapidminer.tools.math.similarity.DistanceMeasure

Cheers,
Simon

gfyang

Hi,

Thanks a lot for the reply. However, it is still not clear enough for me. Would you please give some Java codes?
I tried the following, but failed:


ExampleSet ex=...
Example ex1 = ex.getExample(1);
Example ex2 = ex.getExample(2);
DistanceMeasure myDis = new DistanceMeasure();
double dis = myDis.calculateDistance(ex1, ex2);

It reported DistanceMeasure could not be instantiated?

Thank you.

Sincerely yours,
gfyang

fischer

Hi,

distance Measure is abstract. You can only instantiate its subclasses.

Also, if you are using a distance measure at an operator, try installing a DistanceMeasureHelper.

Cheers,
Simon

gfyang

Hi,

I see. The subclasses work well. Thank you.

Sincerely yours,
gfyang