Github user yu-iskw commented on a diff in the pull request:
https://github.com/apache/spark/pull/6791#discussion_r33102462
--- Diff: python/pyspark/mllib/clustering.py ---
@@ -274,5 +276,63 @@ def _test():
exit(-1)
+class LDAModel(JavaModelWrapper):
+
+ """ A clustering model derived from the LDA method.
+
+ Latent Dirichlet Allocation (LDA), a topic model designed for text
documents.
+ Terminologyu
+ - "word" = "term": an element of the vocabulary
+ - "token": instance of a term appearing in a document
+ - "topic": multinomial distribution over words representing some
concept
+ References:
+ - Original LDA paper (journal version):
+ Blei, Ng, and Jordan. "Latent Dirichlet Allocation." JMLR, 2003.
+
+ >>> from pyspark.mllib.linalg import Vectors
+ >>> from collections import namedtuple
+ >>> from numpy.testing import assert_almost_equal
+ >>> data = [
+ ... [1, Vectors.dense([0.0, 1.0])],
+ ... [2, SparseVector(2, {0: 1.0})],
+ ... ]
+ >>> rdd = sc.parallelize(data)
+ >>> model = LDA.train(rdd, k=2)
+ >>> model.vocabSize()
+ 2
+ >>> topics = model.topicsMatrix()
+ >>> topics_expect = array([[0.5, 0.5], [0.5, 0.5]])
--- End diff --
Can we use `...` to compare an array or a list?
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