Hello:
Im a new user of Mahout library, I test his algorithms with good results,
but I need information about who use of the recommender algorithm in POI
recommendations for a geospatial applications, thanks, bests regards.
The classification phase of Dirichlet uses a most-likely assignment of
points to clusters by default. This means that, unlike the training
phase where points are assigned statistically to likely clusters, the
classification may result in empty clusters even though those clusters
have nonzero
While trying to wrap my head around the Mahout code for SGD I noticed that
the update to the beta terms seems to be doing gradient ascent and not
descent. Could someone help me find the missing minus sign?
The line of code in question from AbstractOnlineLogisticRegression.java,
train() is:
My completely unfounded guess would be the sign is built into gradientBase
On Nov 28, 2012, at 2:19 PM, David Kincaid wrote:
While trying to wrap my head around the Mahout code for SGD I noticed that
the update to the beta terms seems to be doing gradient ascent and not
descent. Could someone
I thought it might be too, but doesn't look like it to me. Of course, I
really have a hard time following vector and matrix math done in Java. Does
v.minus(r) mean v - r or r - v?
On Wed, Nov 28, 2012 at 1:28 PM, David Arthur mum...@gmail.com wrote:
My completely unfounded guess would be the
graidentBase is coming from:
double gradientBase = gradient.get(i);
Prior to that:
Vector gradient = this.gradient.apply(groupKey, actual, instance, this);
this.gradient is an instance of DefaultGradient (in the same project). The
last two lines of the apply function are:
r.assign(v,
Robert's analysis is correct.
This would be worthy of a comment at the least.
On Wed, Nov 28, 2012 at 11:53 AM, Lancaster, Robert (Orbitz)
robert.lancas...@orbitz.com wrote:
graidentBase is coming from:
double gradientBase = gradient.get(i);
Prior to that:
Vector gradient =
or maybe call the variable negativeGradient, instead?
On Wed, Nov 28, 2012 at 12:50 PM, Ted Dunning ted.dunn...@gmail.com wrote:
Robert's analysis is correct.
This would be worthy of a comment at the least.
On Wed, Nov 28, 2012 at 11:53 AM, Lancaster, Robert (Orbitz)
Thanks much, Robert. I see it now. I think I've got the basics of the
implementation down now.
On Wed, Nov 28, 2012 at 1:53 PM, Lancaster, Robert (Orbitz)
robert.lancas...@orbitz.com wrote:
graidentBase is coming from:
double gradientBase = gradient.get(i);
Prior to that:
Vector gradient =
+1
On Wed, Nov 28, 2012 at 12:56 PM, Jake Mannix jake.man...@gmail.com wrote:
or maybe call the variable negativeGradient, instead?
Please to be using UMLGraph [1]. It works very nicely.
/tuxdna
[1] http://www.umlgraph.org/
On Wed, Nov 28, 2012 at 8:12 PM, Ahmet Ylmaz
ahmetyilmazefe...@yahoo.com wrote:
Hi,
I'm trying to learn the internals of Mahout. How can I visualize the class
hierarchy in a UML style?
Are there
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