Add a new sparse weights class

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This would be in addition to what we currently have in terms of the W class. 
The idea is to come up with a separate class that can be used on its own that 
does not carry along all the attributes in W. This would allow for exploration 
of faster ways to construct the sparse attribute of our W as well as serve as 
an interim step to possibly changing the sparse attribute of W with what comes 
out of this ticket. It also gives users a choice between the original W and 
this new sparse class if they don't need everything in W.

We should always keep W for backwards compatibility.  This ticket may 
ultimately result in changing the sparse attribute of double in regards to how 
it is instantiated.

Original issue reported on code.google.com by sjsrey on 13 Apr 2011 at 9:13

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s/sparse attribute of double/sparse attribute of W/

Original comment by sjsrey on 13 Apr 2011 at 9:16

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weights.WSP

Original comment by dfo...@gmail.com on 19 May 2011 at 6:41

• Changed state: Done