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I'm reading a paper about DBSCAN implementation on Map-Reduce. In preprocessing step, it wants to divide dataset and it says:

We consider two strategies in this paper for different scenarios. The first one is given the number of computing slots N and its grid decomposition (N = a ∗ b), it could find an approximate division in raw spatial data.

I don't get it exactly. Does he want to get coefficients of number of processing unit and use them to divide different dimensions of data?

P.S: Please help me choose appropriate tags.

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