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<!DOCTYPE html>
<!-- saved from url=(0092)http://www.techpoweredmath.com/wp-content/uploads/2015/08/spark-dataframes-tutorial-1-4.html -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>spark-dataframes-example</title>
<script src="./spark-dataframes-example_files/require.min.js"></script>
<script src="./spark-dataframes-example_files/jquery.min.js"></script>
<style type="text/css">
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<h2 id="Formatting-a-CSV-into-a-DataFrame">Formatting a CSV into a DataFrame<a class="anchor-link" href="http://www.techpoweredmath.com/wp-content/uploads/2015/08/spark-dataframes-tutorial-1-4.html#Formatting-a-CSV-into-a-DataFrame">¶</a></h2><p>Import the pyspark sql functions necessary for Spark DataFrame operations. I believe that "Row" is new to Spark 1.4, so you'll need a new version of Spark for this to work. Row is very handy if you are working with CSV data and have a reasonably small number of columns.</p>
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<div class=" highlight hl-ipython2"><pre><span class="kn">from</span> <span class="nn">pyspark.sql.types</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">pyspark.sql</span> <span class="kn">import</span> <span class="n">Row</span>
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<p>The basic data abstraction for Spark is an RDD (Resilient Distributed Dataset). I'll start by reading in my data as an RDD, which I name, "rdd".</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">rdd</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">textFile</span><span class="p">(</span><span class="s">'realEstate.csv'</span><span class="p">)</span>
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<p>Spark leverages "lazy" execution, so nothing has been executed yet. We can force spark to do some work and take a peak t the data by calling "take" on our RDD. A take of 5 shows the first 5 rows from our original csv.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">rdd</span><span class="o">.</span><span class="n">take</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
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<pre>[u'street,city,zip,state,beds,baths,sq__ft,type,sale_date,price,latitude,longitude',
u'3526 HIGH ST,SACRAMENTO,95838,CA,2,1,836,Residential,Wed May 21 00:00:00 EDT 2008,59222,38.631913,-121.434879',
u'51 OMAHA CT,SACRAMENTO,95823,CA,3,1,1167,Residential,Wed May 21 00:00:00 EDT 2008,68212,38.478902,-121.431028',
u'2796 BRANCH ST,SACRAMENTO,95815,CA,2,1,796,Residential,Wed May 21 00:00:00 EDT 2008,68880,38.618305,-121.443839',
u'2805 JANETTE WAY,SACRAMENTO,95815,CA,2,1,852,Residential,Wed May 21 00:00:00 EDT 2008,69307,38.616835,-121.439146']</pre>
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<p>Those lines are not separated yet, but we can tell Spark that we want to split them on the commas.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">rdd</span> <span class="o">=</span> <span class="n">rdd</span><span class="o">.</span><span class="n">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">line</span><span class="p">:</span> <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">","</span><span class="p">))</span>
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<p>Now now we can see that each line has been broken into Spark's RDD tuple format, which is what we want. However, we'll want to remove the header before we convert to a DataFrame since there's not a straightforward way (that I know of) to tell Spark to interpret that header as a list of column names.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">rdd</span><span class="o">.</span><span class="n">take</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
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<pre>[[u'street',
u'city',
u'zip',
u'state',
u'beds',
u'baths',
u'sq__ft',
u'type',
u'sale_date',
u'price',
u'latitude',
u'longitude'],
[u'3526 HIGH ST',
u'SACRAMENTO',
u'95838',
u'CA',
u'2',
u'1',
u'836',
u'Residential',
u'Wed May 21 00:00:00 EDT 2008',
u'59222',
u'38.631913',
u'-121.434879']]</pre>
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<p>The next cell strips the header from the RDD by passing a filter and telling Spark we want all members of the RDD that are NOT equal to the header.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">header</span> <span class="o">=</span> <span class="n">rdd</span><span class="o">.</span><span class="n">first</span><span class="p">()</span>
<span class="n">rdd</span> <span class="o">=</span> <span class="n">rdd</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="k">lambda</span> <span class="n">line</span><span class="p">:</span><span class="n">line</span> <span class="o">!=</span> <span class="n">header</span><span class="p">)</span>
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<p>Now we can see that the header has been removed.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">rdd</span><span class="o">.</span><span class="n">take</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
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<pre>[[u'3526 HIGH ST',
u'SACRAMENTO',
u'95838',
u'CA',
u'2',
u'1',
u'836',
u'Residential',
u'Wed May 21 00:00:00 EDT 2008',
u'59222',
u'38.631913',
u'-121.434879'],
[u'51 OMAHA CT',
u'SACRAMENTO',
u'95823',
u'CA',
u'3',
u'1',
u'1167',
u'Residential',
u'Wed May 21 00:00:00 EDT 2008',
u'68212',
u'38.478902',
u'-121.431028']]</pre>
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<p>This is where Spark's handy new "Row" command comes in. We can now map every line from the RDD to a Row of our soon to be DataFrame. Just pipe the result with a .toDF(), and you've got a shiny new Spark DataFrame.</p>
<p>In one sense, Row is nice because it lets you just select the columns you are interested in. This is great if you have a small number of columns. If you have a large number of columns, this would not be so great. I tried passing it arguments like header[0], and was rejected with the error: "keyword can't be an expression." Not sure if there is another workaround here since I didn't spend much more time trying to figure this out, and for this example, I was really only interested in a small number of columns anyway.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span> <span class="o">=</span> <span class="n">rdd</span><span class="o">.</span><span class="n">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">line</span><span class="p">:</span> <span class="n">Row</span><span class="p">(</span><span class="n">street</span> <span class="o">=</span> <span class="n">line</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">city</span> <span class="o">=</span> <span class="n">line</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="nb">zip</span><span class="o">=</span><span class="n">line</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">beds</span><span class="o">=</span><span class="n">line</span><span class="p">[</span><span class="mi">4</span><span class="p">],</span> <span class="n">baths</span><span class="o">=</span><span class="n">line</span><span class="p">[</span><span class="mi">5</span><span class="p">],</span> <span class="n">sqft</span><span class="o">=</span><span class="n">line</span><span class="p">[</span><span class="mi">6</span><span class="p">],</span> <span class="n">price</span><span class="o">=</span><span class="n">line</span><span class="p">[</span><span class="mi">9</span><span class="p">]))</span><span class="o">.</span><span class="n">toDF</span><span class="p">()</span>
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<p>Although the dataframe responds to some RDD syntax such as 'take', the formatting is not especially readable. For a more readable view, try 'show'. Having tried take and show on some much larger data sets too, they seem to be executed differently. Show is sometimes executed in a tiny fraction of the time of take.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">take</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
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<pre>[Row(baths=u'1', beds=u'2', city=u'SACRAMENTO', price=u'59222', sqft=u'836', street=u'3526 HIGH ST', zip=u'95838'),
Row(baths=u'1', beds=u'3', city=u'SACRAMENTO', price=u'68212', sqft=u'1167', street=u'51 OMAHA CT', zip=u'95823'),
Row(baths=u'1', beds=u'2', city=u'SACRAMENTO', price=u'68880', sqft=u'796', street=u'2796 BRANCH ST', zip=u'95815'),
Row(baths=u'1', beds=u'2', city=u'SACRAMENTO', price=u'69307', sqft=u'852', street=u'2805 JANETTE WAY', zip=u'95815'),
Row(baths=u'1', beds=u'2', city=u'SACRAMENTO', price=u'81900', sqft=u'797', street=u'6001 MCMAHON DR', zip=u'95824')]</pre>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">show</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
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<pre>+-----+----+----------+-----+----+----------------+-----+
|baths|beds| city|price|sqft| street| zip|
+-----+----+----------+-----+----+----------------+-----+
| 1| 2|SACRAMENTO|59222| 836| 3526 HIGH ST|95838|
| 1| 3|SACRAMENTO|68212|1167| 51 OMAHA CT|95823|
| 1| 2|SACRAMENTO|68880| 796| 2796 BRANCH ST|95815|
| 1| 2|SACRAMENTO|69307| 852|2805 JANETTE WAY|95815|
| 1| 2|SACRAMENTO|81900| 797| 6001 MCMAHON DR|95824|
+-----+----+----------+-----+----+----------------+-----+
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<h2 id="Pandas">Pandas<a class="anchor-link" href="http://www.techpoweredmath.com/wp-content/uploads/2015/08/spark-dataframes-tutorial-1-4.html#Pandas">¶</a></h2><p>When in PySpark, there is also an easy option to convert to Pandas. Pandas dataframes can also be converted to Spark dataframes.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">toPandas</span><span class="p">()</span><span class="o">.</span><span class="n">head</span><span class="p">()</span>
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<table border="1" class="dataframe">
<thead>
<tr style="text-align: right;">
<th></th>
<th>baths</th>
<th>beds</th>
<th>city</th>
<th>price</th>
<th>sqft</th>
<th>street</th>
<th>zip</th>
</tr>
</thead>
<tbody>
<tr>
<th>0</th>
<td>1</td>
<td>2</td>
<td>SACRAMENTO</td>
<td>59222</td>
<td>836</td>
<td>3526 HIGH ST</td>
<td>95838</td>
</tr>
<tr>
<th>1</th>
<td>1</td>
<td>3</td>
<td>SACRAMENTO</td>
<td>68212</td>
<td>1167</td>
<td>51 OMAHA CT</td>
<td>95823</td>
</tr>
<tr>
<th>2</th>
<td>1</td>
<td>2</td>
<td>SACRAMENTO</td>
<td>68880</td>
<td>796</td>
<td>2796 BRANCH ST</td>
<td>95815</td>
</tr>
<tr>
<th>3</th>
<td>1</td>
<td>2</td>
<td>SACRAMENTO</td>
<td>69307</td>
<td>852</td>
<td>2805 JANETTE WAY</td>
<td>95815</td>
</tr>
<tr>
<th>4</th>
<td>1</td>
<td>2</td>
<td>SACRAMENTO</td>
<td>81900</td>
<td>797</td>
<td>6001 MCMAHON DR</td>
<td>95824</td>
</tr>
</tbody>
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<h2 id="Dataframe-operations">Dataframe operations<a class="anchor-link" href="http://www.techpoweredmath.com/wp-content/uploads/2015/08/spark-dataframes-tutorial-1-4.html#Dataframe-operations">¶</a></h2><p>Once you have converted to a dataframe, many operations like selecting rows/columns and doing counts becomes much easier. Keep in mind that Spark dataframes are not mutable.
For example, if we'd like a dataframe with only the homes in zip code 95815, the syntax should be very comfortable for Pandas and R users.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">favorite_zip</span> <span class="o">=</span> <span class="n">df</span><span class="p">[</span><span class="n">df</span><span class="o">.</span><span class="n">zip</span> <span class="o">==</span> <span class="mi">95815</span><span class="p">]</span>
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<div class=" highlight hl-ipython2"><pre><span class="n">favorite_zip</span><span class="o">.</span><span class="n">show</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
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<pre>+-----+----+----------+------+----+----------------+-----+
|baths|beds| city| price|sqft| street| zip|
+-----+----+----------+------+----+----------------+-----+
| 1| 2|SACRAMENTO| 68880| 796| 2796 BRANCH ST|95815|
| 1| 2|SACRAMENTO| 69307| 852|2805 JANETTE WAY|95815|
| 1| 1|SACRAMENTO|106852| 871| 2930 LA ROSA RD|95815|
| 1| 2|SACRAMENTO| 78000| 800| 3132 CLAY ST|95815|
| 2| 4|SACRAMENTO| 89000|1316| 483 ARCADE BLVD|95815|
+-----+----+----------+------+----+----------------+-----+
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<p>It's also straightforward to choose a subset of columns from your dataframe by calling '.select' on that dataframe.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s">'city'</span><span class="p">,</span><span class="s">'beds'</span><span class="p">)</span><span class="o">.</span><span class="n">show</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span>
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<pre>+--------------+----+
| city|beds|
+--------------+----+
| SACRAMENTO| 2|
| SACRAMENTO| 3|
| SACRAMENTO| 2|
| SACRAMENTO| 2|
| SACRAMENTO| 2|
| SACRAMENTO| 3|
| SACRAMENTO| 3|
| SACRAMENTO| 3|
|RANCHO CORDOVA| 2|
| RIO LINDA| 3|
+--------------+----+
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<p>Here's a count of how many houses have different numbers of bedrooms. Note that some houses seem to have 0 beds, which should be impossible. We'll keep that in mind for later.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">groupBy</span><span class="p">(</span><span class="s">"beds"</span><span class="p">)</span><span class="o">.</span><span class="n">count</span><span class="p">()</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
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<pre>+----+-----+
|beds|count|
+----+-----+
| 0| 108|
| 1| 10|
| 2| 133|
| 3| 413|
| 4| 258|
| 5| 59|
| 6| 3|
| 8| 1|
+----+-----+
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<p>Describe allows us to retrieve summary statistics on one or more columns. Results are returned in a dataframe, so .show() is necessary to see them. Not only are some of the bed values 0, but baths and square feet each have mins of zero, which are bad data points.</p>
<p>Note that there has been a syntax change here since Spark 1.3, and this syntax is specific to Spark 1.4+.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span><span class="o">.</span><span class="n">describe</span><span class="p">([</span><span class="s">'baths'</span><span class="p">,</span> <span class="s">'beds'</span><span class="p">,</span><span class="s">'price'</span><span class="p">,</span><span class="s">'sqft'</span><span class="p">])</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
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<pre>+-------+------------------+------------------+------------------+------------------+
|summary| baths| beds| price| sqft|
+-------+------------------+------------------+------------------+------------------+
| count| 985| 985| 985| 985|
| mean|1.7766497461928934|2.9116751269035532|234144.26395939087|1314.9167512690356|
| stddev|0.8949168036438349|1.3072681384582236| 138295.5847828183| 852.615113131778|
| min| 0| 0| 100000| 0|
| max| 5| 8| 99000| 998|
+-------+------------------+------------------+------------------+------------------+
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<h2 id="Regression-with-MLlib">Regression with MLlib<a class="anchor-link" href="http://www.techpoweredmath.com/wp-content/uploads/2015/08/spark-dataframes-tutorial-1-4.html#Regression-with-MLlib">¶</a></h2><p>To get a feel for MLlib, let's to a very simple linear regression. Import the necessary modules in order to use MLlib to do a linear regression.</p>
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<div class=" highlight hl-ipython2"><pre><span class="kn">import</span> <span class="nn">pyspark.mllib</span>
<span class="kn">import</span> <span class="nn">pyspark.mllib.regression</span>
<span class="kn">from</span> <span class="nn">pyspark.mllib.regression</span> <span class="kn">import</span> <span class="n">LabeledPoint</span>
<span class="kn">from</span> <span class="nn">pyspark.sql.functions</span> <span class="kn">import</span> <span class="o">*</span>
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<p>I'll start by creating a dataframe df that has only the subset of features I'm interested in. I'm going to predict home price from the number of baths, beds, and square feet.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">df</span> <span class="o">=</span> <span class="n">df</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s">'price'</span><span class="p">,</span><span class="s">'baths'</span><span class="p">,</span><span class="s">'beds'</span><span class="p">,</span><span class="s">'sqft'</span><span class="p">)</span>
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<p>Let's remove those rows that have suspicious 0 values for any of the features we want to use for prediction.</p>