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From Apache Wiki <wikidi...@apache.org>
Subject [Hama Wiki] Trivial Update of "Architecture" by udanax
Date Mon, 16 Mar 2009 02:28:40 GMT
Dear Wiki user,

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

------------------------------------------------------------------------------
  - Reduce task select the maximum one
  }}}
  
+ === Compute the infinity norm ===
+ 
+ It's a maximum absolute column sum of matrix.
+ 
+ {{{
+                                             i=n
+ The maximum absolute column sum =   max   ( sum | a_{i,j} | )
+                                   1<=j<=n   i=1
+ 
+ - A map task receives a row n as a key, and vector of each row as its value
+  - emit (column, the absolute value of each entries)
+ - Reduce task sum the absolute values of column, select the one maximum one.
+ }}}
+ 
  === Compute the transpose of a matrix ===
  
  The transpose of a matrix is another matrix in which the rows and columns have been reversed.
The matrix must be square for this work.

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