This short blog post wants to help you manage learning to rank features stores and models in Apache Solr. Here I will list for you the main commands, while in the next post, I will recap the most common errors that can occur during the manipulation of feature stores and models.
Learning to rank features
List
A feature store is a container of features.
A model uses features from only one feature store.
A feature store can be used by many models.
The list of the available feature stores in the “collection1” collection, is available at:
https://localhost:8983/solr/collection1/schema/feature-store
The response looks like:
{
"responseHeader": {
"status": 0,
"QTime": 160
},
"featureStores": [
"first_store",
"second_store"
]
}
Where first_store and second_store are the available feature stores present in collection1.
Upload
To upload a feature store to a feature-store of a specific collection, we use the following curl command.
For the collection1 collection:
curl -XPUT "https://localhost:8983/solr/collection1/schema/feature-store/" --data-
binary "@features.json" -H "Content-type:application/json"
Where features.json is the file containing the features (the feature store we want to upload).
For example:
[
{
"store": "first_store",
"name": "feature_1",
"class": "org.apache.solr.ltr.feature.ValueFeature",
"params": {
"value": "${feature_1}",
"required": false
}
},
{
"store": "first_store",
"name": "feature_2",
"class": "org.apache.solr.ltr.feature.ValueFeature",
"params": {
"value": "${feature_2}",
"required": false
}
},
....
Here “store” is the name of the feature store in the feature-store. It will be visible, after the upload, in the feature-store list.
Delete
To delete a feature store called first_store from the collection1 collection:
curl -XDELETE "https://localhost:8983/solr/collection1/schema/feature-store/first_store"
Learning to rank models
List
As mentioned before:
A model uses features from only one feature store.
A feature store can be used by many models.
The list of the available models in the collection1 collection, is at:
https://localhost:8983/solr/collection1/schema/model-store
And it is something like:
{
"responseHeader":{
"status":0,
"QTime":188},
"models":[{
"name":"model_1",
"class":"org.apache.solr.ltr.model.MultipleAdditiveTreesModel",
"store":"first_store",
"features":[{
"name":"feature_1",
"norm":{"class":"org.apache.solr.ltr.norm.IdentityNormalizer"}},
{
"name":"feature_2",
"norm":{"class":"org.apache.solr.ltr.norm.IdentityNormalizer"}},
....
},
{
"name":"model_2",
"class":"org.apache.solr.ltr.model.MultipleAdditiveTreesModel",
"store":"first_store",
"features":[{
"name":"feature_1",
"norm":{"class":"org.apache.solr.ltr.norm.IdentityNormalizer"}},
{
"name":"feature_3",
"norm":{"class":"org.apache.solr.ltr.norm.IdentityNormalizer"}},
....
Here “name” is the name of the model in the model-store. It will be visible, after the upload, in the model-store list.
Upload
To upload a model to a model-store of a specific collection, we use the curl command:
curl -XPUT "https://localhost:8983/solr/collection1/schema/model-store" --data-binary "@solr-model.json" -H "Content-type:application/json"
Where solr-model.json is the file containing the model we want to upload.
For example:
{
"store": "first_store",
"name": "model_1",
"class": "org.apache.solr.ltr.model.MultipleAdditiveTreesModel",
"features": [
{
"name": "feature_1"
},
{
"name": "feature_2"
},
{
"name": "feature_3"
},
....
Delete
To delete a model called model_1 from the collection1 collection:
curl -XDELETE "https://localhost:8983/solr/collection1/schema/model-store/model_1"
Reload
To reload the collection1 collection:
https://localhost:8983/solr/admin/collections?action=RELOAD&name=collection1&wt=xml
Warning
In using these methods we can run into some errors.
Don’t lose the next post to be sure to correctly use every method!
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