Matrix and Vector Needs (MAHOUT) edited by Grant Ingersoll
Page:
http://cwiki.apache.org/confluence/display/MAHOUT/Matrix+and+Vector+Needs
Changes:
http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=75990&originalVersion=1&revisedVersion=2
Content:
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h1. Intro
We need some basic Matrix operations to start, and will definitely need more as
we go.
h2. Background
See
[http://mail-archives.apache.org/mod_mbox/lucene-mahout-dev/200802.mbox/browser]
h2. Needs
We will more than likely need all the basic Matrix operations, plus some more
advanced ones:
* Addition, Subtraction, Multiplication, Transpose, Inverse, Scaling
For ideas like PageRank/TextRank, iterative approaches that, essentially,
calculate eigenvectors are also useful.
Similarly, for vectors, things like dot/cross product will be useful
h2. Ideas
Use HBase (BigTable) in Hadoop to represent the Matrix. Batching row/column
operations can be useful.
h2. References
Have a look at the old parallel computing libraries like
[ScalaPACK|http://www.netlib.org/scalapack/], others
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