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id="wrap"> - <body class=""> + <div class="row"> - <div class="container"> - <h1 id="faq-for-using-mahout-with-spark">FAQ for using Mahout with Spark</h1> + <div class="col-lg-8"> + <h1 id="faq-for-using-mahout-with-spark">FAQ for using Mahout with Spark</h1> <p><strong>Q: Mahout Spark shell doesnât start; âClassNotFoundâ problems or various classpath problems.</strong></p> @@ -220,10 +180,10 @@ the classpath is sane and is made available to Mahout:</p> <ol> <li>Check Spark is of correct version (same as in Mahoutâs poms), is compiled and SPARK_HOME is set.</li> <li>Check Mahout is compiled and MAHOUT_HOME is set.</li> - <li>Run <code>$SPARK_HOME/bin/compute-classpath.sh</code> and make sure it produces sane result with no errors. + <li>Run <code class="highlighter-rouge">$SPARK_HOME/bin/compute-classpath.sh</code> and make sure it produces sane result with no errors. If it outputs something other than a straightforward classpath string, most likely Spark is not compiled/set correctly (later spark versions require -<code>sbt/sbt assembly</code> to be run, simply runnig <code>sbt/sbt publish-local</code> is not enough any longer).</li> - <li>Run <code>$MAHOUT_HOME/bin/mahout -spark classpath</code> and check that path reported in step (3) is included.</li> +<code class="highlighter-rouge">sbt/sbt assembly</code> to be run, simply runnig <code class="highlighter-rouge">sbt/sbt publish-local</code> is not enough any longer).</li> + <li>Run <code class="highlighter-rouge">$MAHOUT_HOME/bin/mahout -spark classpath</code> and check that path reported in step (3) is included.</li> </ol> <p><strong>Q: I am using the command line Mahout jobs that run on Spark or am writing my own application that uses @@ -250,30 +210,26 @@ or mis-identified classes.</li> <p><strong>A:</strong> In the Mahout spark-shell the SparkContext is called âsdcâ, where the âdâ stands for distributed.</p> - </div> - + </div> -</div> -<div id="footer"> - <div class="container"> - <p>© 2017 Apache Mahout - with help from <a href="http://jekyllbootstrap.com"; target="_blank" title="The Definitive Jekyll Blogging Framework">Jekyll Bootstrap</a> - and <a href="http://getbootstrap.com"; target="_blank">Bootstrap</a> - </p> </div> -</div> - - +</div> + <footer class="footer bg-light"> + <div class="container text-center small"> + Copyright © 2014-2017 The Apache Software Foundation, Licensed under the Apache License, Version 2.0. + </div> +</footer> + <script src="/assets/vendor/jquery/jquery-slim.min.js"></script> + <script src="/assets/vendor/popper/popper.min.js"></script> + <script src="/assets/vendor/bootstrap/js/bootstrap.min.js"></script> + <script src="/assets/header.js"></script> + <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"; type="text/javascript"></script> -<!-- Latest compiled and minified JavaScript, requires jQuery 1.x (2.x not supported in IE8) --> -<!-- Placed at the end of the document so the pages load faster --> -<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";></script> -<script src="/assets/themes/mahout3/js/bootstrap.min.js"></script> </body> -</html> +</html>
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id="wrap"> - <body class=""> + <div class="row"> - <div class="container"> - <h1 id="scala--spark-bindings">Scala & Spark Bindings:</h1> + <div class="col-lg-8"> + <h1 id="scala--spark-bindings">Scala & Spark Bindings:</h1> <p><em>Bringing algebraic semantics</em></p> <h2 id="what-is-scala--spark-bindings">What is Scala & Spark Bindings?</h2> <p>In short, Scala & Spark Bindings for Mahout is Scala DSL and algebraic optimizer of something like this (actual formula from <strong>(d)spca</strong>)</p> -<p><code>\[\mathbf{G}=\mathbf{B}\mathbf{B}^{\top}-\mathbf{C}-\mathbf{C}^{\top}+\mathbf{s}_{q}\mathbf{s}_{q}^{\top}\boldsymbol{\xi}^{\top}\boldsymbol{\xi}\]</code></p> +<p><code class="highlighter-rouge">\[\mathbf{G}=\mathbf{B}\mathbf{B}^{\top}-\mathbf{C}-\mathbf{C}^{\top}+\mathbf{s}_{q}\mathbf{s}_{q}^{\top}\boldsymbol{\xi}^{\top}\boldsymbol{\xi}\]</code></p> <p>bound to in-core and distributed computations (currently, on Apache Spark).</p> <p>Mahout Scala & Spark Bindings expression of the above:</p> -<pre><code> val g = bt.t %*% bt - c - c.t + (s_q cross s_q) * (xi dot xi) +<div class="highlighter-rouge"><pre class="highlight"><code> val g = bt.t %*% bt - c - c.t + (s_q cross s_q) * (xi dot xi) </code></pre> +</div> <p>The main idea is that a scientist writing algebraic expressions cannot care less of distributed operation plans and works <strong>entirely on the logical level</strong> just like he or she would do with R.</p> @@ -300,30 +261,26 @@ Spark, Flink and H20.</p> * In-core GPU matrix adapters --> - </div> - + </div> -</div> -<div id="footer"> - <div class="container"> - <p>© 2017 Apache Mahout - with help from <a href="http://jekyllbootstrap.com"; target="_blank" title="The Definitive Jekyll Blogging Framework">Jekyll Bootstrap</a> - and <a href="http://getbootstrap.com"; target="_blank">Bootstrap</a> - </p> </div> -</div> - - +</div> + <footer class="footer bg-light"> + <div class="container text-center small"> + Copyright © 2014-2017 The Apache Software 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<!--<form class="navbar-form navbar-left">--> + <!--<div class="form-group">--> + <!--<input type="text" class="form-control" placeholder="Search">--> + <!--</div>--> + <!--<button type="submit" class="btn btn-default">Submit</button>--> + <!--</form>--> + <!--<ul class="nav navbar-nav navbar-right">--> + <!--<a class="dropdown-item" href="http://github.com/apache/mahout";>Github</a></li>--> - </div><!-- /.container-fluid --> -</nav> -<body> -<div id="wrap"> - <body class=""> + <!--</ul>--> + </div><!-- /.navbar-collapse --> + </div> +</nav> - <div class="container"> - + <div class="container mt-5 pb-4"> -<div class="page-header"> - <h1>Welcome to the Docs <small>Apache Mahout from 30,000 feet (10,000 meters)</small></h1> -</div> + <div class="row"> -<div class="row"> - <div class="col-xs-12"> - <p>Youâve probably already noticed Mahout has a lot of things going on at different levels, and it can be hard to know where + <div class="col-lg-8"> + <p>Youâve probably already noticed Mahout has a lot of things going on at different levels, and it can be hard to know where to start. Letâs provide an overview to help you see how the pieces fit together. In general the stack is something like this:</p> <ol> @@ -227,12 +179,13 @@ to start. Letâs provide an overview to help you see how the pieces fit togeth <p>You have an JAVA/Scala applicatoin (skip this if youâre working from an interactive shell or Apache Zeppelin)</p> -<pre><code>def main(args: Array[String]) { +<div class="highlighter-rouge"><pre class="highlight"><code>def main(args: Array[String]) { println("Welcome to My Mahout App") if (args.isEmpty) { </code></pre> +</div> <p>This may seem like a trivial part to call out, but the point is important- Mahout runs <em>inline</em> with your regular application code. E.g. if this is an Apache Spark app, then you do all your Spark things, including ETL and data prep in the same @@ -243,23 +196,25 @@ application, and then invoke Mahoutâs mathematically expressive Scala DSL when <p>So when you get to a point in your code where youâre ready to math it up (in this example Spark) you can elegently express yourself mathematically.</p> -<pre><code>implicit val sdc: org.apache.mahout.sparkbindings.SparkDistributedContext = sc2sdc(sc) +<div class="highlighter-rouge"><pre class="highlight"><code>implicit val sdc: org.apache.mahout.sparkbindings.SparkDistributedContext = sc2sdc(sc) val A = drmWrap(rddA) val B = drmWrap(rddB) val C = A.t %*% A + A %*% B.t </code></pre> +</div> -<p>Weâve defined a <code>MahoutDistributedContext</code> (which is a wrapper on the Spark Context), and two Disitributed Row Matrices (DRMs) +<p>Weâve defined a <code class="highlighter-rouge">MahoutDistributedContext</code> (which is a wrapper on the Spark Context), and two Disitributed Row Matrices (DRMs) which are wrappers around RDDs (in Spark).</p> <h2 id="logical--physical-dag">Logical / Physical DAG</h2> <p>At this point there is a bit of optimization that happens. For example, consider the</p> -<pre><code>A.t %*% A +<div class="highlighter-rouge"><pre class="highlight"><code>A.t %*% A </code></pre> +</div> <p>Which is</p> <center>\(\mathbf{A^\intercal A}\)</center> @@ -271,8 +226,9 @@ more efficient way to calculate <foo>\(\mathbf{A^\intercal A}\)</foo> that doesn <p>Mahout converts this code into something that looks like:</p> -<pre><code>OpAtA(A) + OpABt(A, B) // illustrative pseudocode with real functions called +<div class="highlighter-rouge"><pre class="highlight"><code>OpAtA(A) + OpABt(A, B) // illustrative pseudocode with real functions called </code></pre> +</div> <p>Thereâs a little more magic that happens at this level, but the punchline is <em>Mahout translates the pretty scala into a a series of operators, which at the next level are turned implemented at the engine</em>.</p> @@ -283,19 +239,19 @@ a series of operators, which at the next level are turned implemented at the eng <ol> <li>What the engine specific underlying structure for a DRM is (in Spark its an RDD). The underlying structure also has -rows of <code>MahoutVector</code>s, so in Spark <code>RDD[(index, MahoutVector)]</code>. This will be important when we get to the native solvers.</li> +rows of <code class="highlighter-rouge">MahoutVector</code>s, so in Spark <code class="highlighter-rouge">RDD[(index, MahoutVector)]</code>. This will be important when we get to the native solvers.</li> <li>Implementing a set of BLAS (basic linear algebra) functions for working on the underlying structure- in Spark this means -implementing things like <code>AtA</code> on an RDD. See <a href="https://github.com/apache/mahout/tree/master/spark/src/main/scala/org/apache/mahout/sparkbindings";>the sparkbindings on github</a></li> +implementing things like <code class="highlighter-rouge">AtA</code> on an RDD. See <a href="https://github.com/apache/mahout/tree/master/spark/src/main/scala/org/apache/mahout/sparkbindings";>the sparkbindings on github</a></li> </ol> <p>Now your mathematically expresive Samsara Scala code has been translated into optimized engine specific functions.</p> <h2 id="native-solvers">Native Solvers</h2> -<p>Recall how I said the rows of the DRMs are <code>org.apache.mahout.math.Vector</code>. Here is where this becomes important. Iâm going +<p>Recall how I said the rows of the DRMs are <code class="highlighter-rouge">org.apache.mahout.math.Vector</code>. Here is where this becomes important. Iâm going to explain this in the context of Spark, but the principals apply to all distributed backends.</p> -<p>If you are familiar with how mapping and reducing in Spark, then envision this RDD of <code>MahoutVector</code>s, each partition, +<p>If you are familiar with how mapping and reducing in Spark, then envision this RDD of <code class="highlighter-rouge">MahoutVector</code>s, each partition, and indexed collection of vectors is a <em>block</em> of the distributed matrix, however this <em>block</em> is totally incore, and therefor is treated like an in core matrix.</p> @@ -309,47 +265,39 @@ and vectors which are implemented on various native solvers.</p> <p>The default ânative solverâ is the JVM, which isnât native at all- and if no actual native solvers are present operations will fall back to this. However, IF a native solver is present (the jar was added to the notebook), then the magic will happen.</p> -<p>Imagine still we have our Spark executor- it has this block of a matrix sitting in its core. Now letâs suppose the <code>ViennaCl-OMP</code> +<p>Imagine still we have our Spark executor- it has this block of a matrix sitting in its core. Now letâs suppose the <code class="highlighter-rouge">ViennaCl-OMP</code> native solver is in use. When Spark calls an operation on this incore matrix, the matrix dumps out of the JVM and the calculation is carried out on <em>all available CPUs</em>.</p> -<p>In a similar way, the <code>ViennaCL</code> native solver dumps the matrix out of the JVM and looks for a GPU to execute the operations on.</p> +<p>In a similar way, the <code class="highlighter-rouge">ViennaCL</code> native solver dumps the matrix out of the JVM and looks for a GPU to execute the operations on.</p> <p>Once the operations are complete, the result is loaded back up into the JVM, and Spark (or whatever distributed engine) and shipped back to the driver.</p> -<p>The native solver operatoins are only defined on <code>org.apache.mahout.math.Vector</code> and <code>org.apache.mahout.math.Matrix</code>, which is -why it is critical that the underlying structure composed row-wise of <code>Vector</code> or <code>Matrices</code>.</p> +<p>The native solver operatoins are only defined on <code class="highlighter-rouge">org.apache.mahout.math.Vector</code> and <code class="highlighter-rouge">org.apache.mahout.math.Matrix</code>, which is +why it is critical that the underlying structure composed row-wise of <code class="highlighter-rouge">Vector</code> or <code class="highlighter-rouge">Matrices</code>.</p> - </div> -</div> + </div> </div> - </div> -<div id="footer"> - <div class="container"> - <p>© 2017 Apache Mahout - with help from <a href="http://jekyllbootstrap.com"; target="_blank" title="The Definitive Jekyll Blogging Framework">Jekyll Bootstrap</a> - and <a href="http://getbootstrap.com"; target="_blank">Bootstrap</a> - </p> - </div> -</div> - - - - + <footer class="footer bg-light"> + <div class="container text-center small"> + Copyright © 2014-2017 The Apache Software Foundation, Licensed under the Apache License, Version 2.0. + </div> +</footer> + <script src="/assets/vendor/jquery/jquery-slim.min.js"></script> + <script src="/assets/vendor/popper/popper.min.js"></script> + <script src="/assets/vendor/bootstrap/js/bootstrap.min.js"></script> + <script src="/assets/header.js"></script> + <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"; type="text/javascript"></script> -<!-- Latest compiled and minified JavaScript, requires jQuery 1.x (2.x not supported in IE8) --> -<!-- Placed at the end of the document so the pages load faster --> -<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";></script> -<script src="/assets/themes/mahout3/js/bootstrap.min.js"></script> </body> -</html> +</html>
