Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7916#discussion_r36149160
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala ---
@@ -214,29 +214,61 @@ class LocalLDAModel private[clustering] (
gammaShape)
}
+ /**
+ * Calculates a lower bound on the log likelihood of the entire corpus
and inferred topics.
+ * Note that this bound sums 2 parts:
+ * - a bound on the log likelihood of the corpus, which scales with
corpus size.
+ * See [[logLikelihood()]].
+ * - a bound on the log likelihood of the estimated topics (topic-term
distributions),
+ * which does not scale with corpus size.
+ * See [[topicsLogLikelihood()]].
+ *
+ * See Equation (16) in original Online LDA paper.
+ *
+ * @param documents test corpus to use for calculating log likelihood
+ * @return variational lower bound on the log likelihood of the entire
corpus and inferred topics
+ */
+ def fullLogLikelihood(documents: RDD[(Long, Vector)]): Double = {
--- End diff --
nit: *joint*LogLikelihood
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