You can not just use the model output from Ranklib. I opened this issue few months ago but I never had the right time/motivation to implement it [1] . You need to convert it in the Apache Solr LTR expected format. I remember a script should be available[2]
[1] https://sourceforge.net/p/lemur/feature-requests/144/ [2] https://github.com/ryac/lambdamart-xml-to-json -------------------------- Alessandro Benedetti Search Consultant, R&D Software Engineer, Director www.sease.io On Thu, Feb 15, 2018 at 3:55 PM, Brian Yee <b...@wayfair.com> wrote: > I'm not sure if this will solve your problem, but you are using a very old > version of Ranklib. The most recent version is 2.9. > https://sourceforge.net/projects/lemur/files/lemur/RankLib-2.9/ > > > -----Original Message----- > From: kusha.pande [mailto:kusha.pa...@gmail.com] > Sent: Thursday, February 15, 2018 8:12 AM > To: solr-user@lucene.apache.org > Subject: solr ltr jar is not able to recognize MultipleAdditiveTreesModel > > Hi I am trying to upload a training model generated from ranklib jar using > lamdamart mart. > > The model is like > {"class":"org.apache.solr.ltr.model.MultipleAdditiveTreesModel", > "name":"lambdamartmodel", > "params" : { > "trees" :[ > { > "id": "1", > "weight": "0.1", > "split": { > "feature": "8", > "threshold": "7.111333", > "split": [ > { > "pos": "left", > "feature": "8", > "threshold": "5.223557", > "split": [ > { > "pos": "left", > "feature": "8", > "threshold": "3.2083516", > "split": [ > { > "pos": "left", > "feature": "1", > "threshold": "100.0", > "split": [ > { > "pos": "left", > "feature": "8", > "threshold": "2.2626402", > "split": [ > { > "pos": "left", > "feature": "8", > "threshold": "2.2594802", > "split": [ > { > "pos": "left", > "output": "-1.6371088" > }, > { > "pos": "right", > "output": "-2.0" > } > ] > }, > { > "pos": "right", > "feature": "8", > "threshold": "2.4438097", > "split": [ > { > "pos": "left", > "feature": "2", > "threshold": "0.05", > "split": [ > { > "pos": "left", > "output": "2.0" > }, ...... > > > getting an exception as : > Exception: Status: 400 Bad Request > Response: { > "responseHeader":{ > "status":400, > "QTime":43}, > "error":{ > "metadata":[ > "error-class","org.apache.solr.common.SolrException", > "root-error-class","java.lang.RuntimeException"], > "msg":"org.apache.solr.ltr.model.ModelException: Model type does not > exist org.apache.solr.ltr.model.MultipleAdditiveTreesModel", > "code":400}} > . > > I have used RankLib-2.1-patched.jar to generate the model and converted the > generated xml to json. > > > > > > -- > Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html >
