[SPARK-3838][examples][mllib][python] Word2Vec example in python

This pull request refers to issue: https://issues.apache.org/jira/browse/SPARK-3838

Python example for word2vec
mengxr

Author: Anant <anant.asty@gmail.com>

Closes #2952 from anantasty/SPARK-3838 and squashes the following commits:

87bd723 [Anant] remove stop line
4bd439e [Anant] Changes as per code review. Fized error in word2vec python example, simplified example in docs.
3d3c9ee [Anant] Added empty line after python imports
0c90c31 [Anant] Fixed erroneous code. I was still treating each line to be a single word instead of 16 words
ee4f5f6 [Anant] Fixes from code review comments
c637bcf [Anant] Added word2vec python example to docs
269f31f [Anant] added example in docs
c015b14 [Anant] Added python example for word2vec

1 files changed, 17 insertions, 0 deletions

diff --git a/docs/mllib-feature-extraction.md b/docs/mllib-feature-extraction.md
index 886d71df47..197bc77d50 100644
--- a/docs/mllib-feature-extraction.md
+++ b/docs/mllib-feature-extraction.md
@@ -203,6 +203,23 @@ for((synonym, cosineSimilarity) <- synonyms) {
 }
 {% endhighlight %}
 </div>
+<div data-lang="python">
+{% highlight python %}
+from pyspark import SparkContext
+from pyspark.mllib.feature import Word2Vec
+
+sc = SparkContext(appName='Word2Vec')
+inp = sc.textFile("text8_lines").map(lambda row: row.split(" "))
+
+word2vec = Word2Vec()
+model = word2vec.fit(inp)
+
+synonyms = model.findSynonyms('china', 40)
+
+for word, cosine_distance in synonyms:
+    print "{}: {}".format(word, cosine_distance)
+{% endhighlight %}
+</div>
 </div>
 
 ## StandardScaler