[Hama Wiki] Trivial Update of "Architecture" by udanax

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

The comment on the change is:
Add some hint

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  = Sparse Matrix =
  
+ '''NOTE:''' 
+ 
- '''NOTE''' that Sparse matrix operations cannot be optimized.
+ * Sparse matrix operations cannot be optimized.
+ * Sparse structures which are growable can exceed the initial bandwidth allocation, while those which are not growable are fixed, and over-allocation will cause an error
+  * 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? ==