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From Apache Wiki <wikidi...@apache.org>
Subject [Hama Wiki] Trivial Update of "Architecture" by udanax
Date Thu, 07 Aug 2008 12:52:44 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hama Wiki" for change notification.

The following page has been changed by udanax:
http://wiki.apache.org/hama/Architecture

------------------------------------------------------------------------------
  [[BR]]~-''But please make the content less visible by using smaller fonts. -- Edward J.
Yoon''-~
  
  ----
+ = Overview =
+ 
+ == Package Structure ==
+ 
+  * org.apache.hama : Dense and structured sparse matrices
+  * org.apache.hama.algebra : Algebraic operations on map/reduce
+  * org.apache.hama.io : I/O operations with matrices and vectors
+  * org.apache.hama.mapred : Map/Reduce Input/Output Formats
+  * org.apache.hama.sparse : Unstructured sparse matrices
+ ----
- = Sparse Matrix =
+ == Sparse Matrix ==
  
  '''NOTE:''' 
  
@@ -15, +25 @@

   * Matrices which are column major typically perform better with column-oriented operations,
and likewise for row major matrices. Matrix/vector multiplication is row-major, while transpose
multiplication is column-major
  
  
- == Why sparse matrices? ==
+ === Why sparse matrices? ===
  
   * Many classes of problems result in matrices with a large number of zeros
   * A sparse matrix is a special class of matrix that allows only the non-zero terms to be
stored
   * Reduction in the storage requirements for sparse matrices
   * Significant speed improvement as many calculations involving zero elements are neglected
  
- == Storage of sparse matrices ==
+ === Storage of sparse matrices ===
  
  We choosed HBase which column-oriented sparse table storage to reduce storage and complexity.
  

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