Yeah, MAHOUT-835 removed the callbacks from the code, so the suggested implementation is not relevant any more.
On Sat, Oct 15, 2011 at 11:15 AM, Sean Owen (Resolved) (JIRA) < [email protected]> wrote: > > [ > https://issues.apache.org/jira/browse/MAHOUT-713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel] > > Sean Owen resolved MAHOUT-713. > ------------------------------ > > Resolution: Won't Fix > > I don't think anyone has come forward to work on this, and have no evidence > that will happen. Marking WontFix for now. > > > Random Forest Prototypes > > ------------------------ > > > > Key: MAHOUT-713 > > URL: https://issues.apache.org/jira/browse/MAHOUT-713 > > Project: Mahout > > Issue Type: New Feature > > Components: Classification > > Reporter: Oleg Levchenko > > Priority: Minor > > > > Below is an explanation by Breinman ( > http://www.stat.berkeley.edu/~breiman/RandomForests/cc_home.htm#prototype > ): > > Prototypes are a way of getting a picture of how the variables relate to > the classification. > > For the jth class, we find the case that has the largest number of class > j cases among its k nearest neighbors, determined using the proximities. > Among these k cases we find the median, 25th percentile, and 75th percentile > for each variable. > > The medians are the prototype for class j and the quartiles give an > estimate of is stability. > > For the second prototype, we repeat the procedure but only consider cases > that are not among the original k, and so on. > > Prototypes for continuous variables are standardized by subtractng the > 5th percentile and dividing by the difference between the 95th and 5th > percentiles. > > For categorical variables, the prototype is the most frequent value. > > -- > This message is automatically generated by JIRA. > If you think it was sent incorrectly, please contact your JIRA > administrators: > https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa > For more information on JIRA, see: http://www.atlassian.com/software/jira > > >
