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\[http://incubator.apache.org/hama Hama\] is a parallel matrix computation package, which is a library of matrix operations for large-scale processing and development environments. It is also a \[http://wiki.apache.org/hadoop/HadoopMapReduce Map/Reduce\] framework for a large-scale numerical analysis and data mining, which need the intensive computation power of matrix inversion, e.g., linear regression, PCA, SVM and etc. It will be useful for many scientific applications, e.g., physics computations, linear algebra, computational fluid dynamics, statistics, graphic rendering and many more.