April 2017
Intermediate to advanced
532 pages
12h 39m
English
book
Machine Learning with Spark - Second Edition
by Rajdeep Dua, Brian O'Neill, Stephen Boesch, Manpreet Singh Ghotra, Nick Pentreath
Content preview from Machine Learning with Spark - Second Edition
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Filling in bad or missing data
Let's take a looks at the year of movie review and clean it up.
We have already seen an example of filtering out bad data. Following on from the preceding code, the following code snippet applies the fill-in approach to the bad release date record by assigning a value which is Empty String as 1900 (this will be later replaced by the Median):
Util.spark.udf.register("convertYear", Util.convertYear _) movie_data_df.show(false) val movie_years = Util.spark.sql("select convertYear(date) as year from movie_data") movie_years.createOrReplaceTempView("movie_years") Util.spark.udf.register("replaceEmptyStr", replaceEmptyStr _) val years_replaced = Util.spark.sql("select replaceEmptyStr(year) as r_year from movie_years") ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.