People who do ML for a job?<p>There&#x27;s plenty of heavy duty machine learning libraries and implementations for big data platforms. Just spark alone has a fairly high quality one:<p><a href="http:&#x2F;&#x2F;spark.apache.org&#x2F;docs&#x2F;latest&#x2F;mllib-guide.html" rel="nofollow">http:&#x2F;&#x2F;spark.apache.org&#x2F;docs&#x2F;latest&#x2F;mllib-guide.html</a>