By Yike Guo, R.L. Grossman
High functionality facts Mining: Scaling Algorithms, functions and Systems brings jointly in a single position vital contributions and up to date examine leads to this speedy relocating sector.
High functionality information Mining: Scaling Algorithms, purposes and Systems serves as an outstanding reference, supplying perception into one of the most demanding examine concerns within the box.
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Extra resources for High Performance Data Mining: Scaling Algorithms, Applications and Systems
We have the following three design decisions: 1. How to partition the MBRs of the leaf nodes such that nearby rectangles are in the same partition, and the size of each partition is almost the same? 2. How to distribute the partitions of rectangles onto the computers? 3. How to replicate the index among 1 computers? For the first question, we propose to use space filling Hilbert curves to achieve good clustering. In a k-dimensional space, a space-filling curve starts with a path on a k-dimensional grid of side 2.
If the space utilization of the R*-tree is high (near 100%), the number of objects on every data page will be almost the same. 100% space utilization can be achieved by using index packing techniques (cf. Kamel and Faloutsos, 1993). 2. 0LQLPL]HGFRPPXQLFDWLRQFRVWNearby objects are assigned to the same computer by partitioning data pages using Hilbert curves. 3. 'LVWULEXWHGGDWDDFFHVVLocal and remote data can be efficiently accessed (cf. Lemma 2). , 1996), to distributed spatial index structures onto several computers.
The replicated index provides an efficient access of data, and the interference between computers is also minimized through the local access of the data. The slave-to-slave and master-to-slaves communication is implemented by message passing. The master manages the task of dynamic load balancing and merges the results produced by the slaves. We implemented our method on a number of workstations connected via Ethernet (10 Mbit). A performance evaluation shows that PDBSCAN scales up very well and has excellent speedup and sizeup behavior.