Github user pferrel commented on a diff in the pull request:
https://github.com/apache/incubator-predictionio/pull/269#discussion_r73793199
--- Diff: data/src/main/scala/io/prediction/data/storage/Models.scala ---
@@ -78,3 +78,6 @@ class ModelSerializer extends CustomSerializer[Model](
Nil)
}
))
+
+// Use where models are saved outside the usual methods in pio
+case class NullModel()
--- End diff --
ready for review
This is to avoid using a java `null` for cases where the model is not
stored in hdfs. By using this model any template can choose to store the model
in a DB or as the Universal Recommender does, in Elasticsearch.
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