Hi Jianxiong,
Thanks for reporting this. I think this is a bug and have filed
https://issues.apache.org/jira/browse/SOLR-10421 ticket for fixing it.
Regards,
Christine
----- Original Message -----
From: solr-user@lucene.apache.org
To: solr-user@lucene.apache.org
At: 03/31/17 23:19:27
Hi,
I created a toy learning-to-rank model in solr in order to show the issues.
Feature.json
---------
[
{
"store" : "wikiFeatureStore",
"name" : "doc_len",
"class" : "org.apache.solr.ltr.feature.FieldLengthFeature",
"params" : {"field":"a_text"}
},
{
"store" : "wikiFeatureStore",
"name" : "rankScore",
"class" : "org.apache.solr.ltr.feature.OriginalScoreFeature",
"params" : {}
}
]
model.json
-------
{
"store" : "wikiFeatureStore",
"class" : "org.apache.solr.ltr.model.LinearModel",
"name" : "wiki_qaModel",
"features" : [
{ "name" : "doc_len",
"norm" : {
"class" : "org.apache.solr.ltr.norm.MinMaxNormalizer",
"params" : {"min": "1.0", "max" : "113.77778" }
}
},
{ "name" : "rankScore",
"norm" : {
"class" : "org.apache.solr.ltr.norm.MinMaxNormalizer",
"params" : {"min": "0.0", "max" : "49.60385" }
}
}
],
"params" : {
"weights": {
"doc_len": 0.322,
"rankScore": 0.98
}
}
}
I could upload both feature and model and performed re-ranking based
on the above model. The issue was that when I stopped the solr
server and restarted it.
I got error message when I ran the same query to extract the features:
"Caused by: org.apache.solr.common.SolrException: Failed to create new
ManagedResource /schema/model-store of type
org.apache.solr.ltr.store.rest.ManagedModelStore due to:
java.lang.IllegalArgumentException: argument type mismatch
at
org.apache.solr.rest.RestManager.createManagedResource(RestManager.java:700)
at
org.apache.solr.rest.RestManager.addRegisteredResource(RestManager.java:666)
at org.apache.solr.rest.RestManager.access$300(RestManager.java:59)
at
org.apache.solr.rest.RestManager$Registry.registerManagedResource(RestManager.java:231)
at
org.apache.solr.ltr.store.rest.ManagedModelStore.registerManagedModelStore(ManagedModelStore.java:51)
at
org.apache.solr.ltr.search.LTRQParserPlugin.inform(LTRQParserPlugin.java:124)
at
org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:719)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:931)
... 9 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.solr.util.SolrPluginUtils.invokeSetters(SolrPluginUtils.java:1077)
at org.apache.solr.ltr.norm.Normalizer.getInstance(Normalizer.java:49)
"
I found that the issue was related to
solr-6.4.2/server/solr/my_collection/conf/_schema_model-store.json
"
{
"initArgs":{},
"initializedOn":"2017-03-31T20:51:59.494Z",
"updatedSinceInit":"2017-03-31T20:54:54.841Z",
"managedList":[{
"name":"wiki_qaModel",
"class":"org.apache.solr.ltr.model.LinearModel",
"store":"wikiFeatureStore",
"features":[
{
"name":"doc_len",
"norm":{
"class":"org.apache.solr.ltr.norm.MinMaxNormalizer",
"params":{
"min":1.0,
"max":113.77777862548828}}},
...
"
Here the data type for "min'' and "max" are double. When I manually
changed them to string. Then everything worked as expected.
"
"norm":{
"class":"org.apache.solr.ltr.norm.MinMaxNormalizer",
"params":{
"min": "1.0",
"max": "113.77777862548828"}}},
Any insights into the above strange behavior?
Thanks
Jianxiong
