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| <h1 class="title">Frequent Pattern Mining - RDD-based API</h1> |
| |
| |
| <p>Mining frequent items, itemsets, subsequences, or other substructures is usually among the |
| first steps to analyze a large-scale dataset, which has been an active research topic in |
| data mining for years. |
| We refer users to Wikipedia’s <a href="http://en.wikipedia.org/wiki/Association_rule_learning">association rule learning</a> |
| for more information. |
| <code class="language-plaintext highlighter-rouge">spark.mllib</code> provides a parallel implementation of FP-growth, |
| a popular algorithm to mining frequent itemsets.</p> |
| |
| <h2 id="fp-growth">FP-growth</h2> |
| |
| <p>The FP-growth algorithm is described in the paper |
| <a href="https://doi.org/10.1145/335191.335372">Han et al., Mining frequent patterns without candidate generation</a>, |
| where “FP” stands for frequent pattern. |
| Given a dataset of transactions, the first step of FP-growth is to calculate item frequencies and identify frequent items. |
| Different from <a href="http://en.wikipedia.org/wiki/Apriori_algorithm">Apriori-like</a> algorithms designed for the same purpose, |
| the second step of FP-growth uses a suffix tree (FP-tree) structure to encode transactions without generating candidate sets |
| explicitly, which are usually expensive to generate. |
| After the second step, the frequent itemsets can be extracted from the FP-tree. |
| In <code class="language-plaintext highlighter-rouge">spark.mllib</code>, we implemented a parallel version of FP-growth called PFP, |
| as described in <a href="https://doi.org/10.1145/1454008.1454027">Li et al., PFP: Parallel FP-growth for query recommendation</a>. |
| PFP distributes the work of growing FP-trees based on the suffixes of transactions, |
| and hence more scalable than a single-machine implementation. |
| We refer users to the papers for more details.</p> |
| |
| <p><code class="language-plaintext highlighter-rouge">spark.mllib</code>’s FP-growth implementation takes the following (hyper-)parameters:</p> |
| |
| <ul> |
| <li><code class="language-plaintext highlighter-rouge">minSupport</code>: the minimum support for an itemset to be identified as frequent. |
| For example, if an item appears 3 out of 5 transactions, it has a support of 3/5=0.6.</li> |
| <li><code class="language-plaintext highlighter-rouge">numPartitions</code>: the number of partitions used to distribute the work.</li> |
| </ul> |
| |
| <p><strong>Examples</strong></p> |
| |
| <div class="codetabs"> |
| <div data-lang="scala"> |
| |
| <p><a href="api/scala/org/apache/spark/mllib/fpm/FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code></a> implements the |
| FP-growth algorithm. |
| It takes an <code class="language-plaintext highlighter-rouge">RDD</code> of transactions, where each transaction is an <code class="language-plaintext highlighter-rouge">Array</code> of items of a generic type. |
| Calling <code class="language-plaintext highlighter-rouge">FPGrowth.run</code> with transactions returns an |
| <a href="api/scala/org/apache/spark/mllib/fpm/FPGrowthModel.html"><code class="language-plaintext highlighter-rouge">FPGrowthModel</code></a> |
| that stores the frequent itemsets with their frequencies. The following |
| example illustrates how to mine frequent itemsets and association rules |
| (see <a href="mllib-frequent-pattern-mining.html#association-rules">Association |
| Rules</a> for |
| details) from <code class="language-plaintext highlighter-rouge">transactions</code>.</p> |
| |
| <p>Refer to the <a href="api/scala/org/apache/spark/mllib/fpm/FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code> Scala docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="k">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowth</span> |
| <span class="k">import</span> <span class="nn">org.apache.spark.rdd.RDD</span> |
| |
| <span class="k">val</span> <span class="nv">data</span> <span class="k">=</span> <span class="nv">sc</span><span class="o">.</span><span class="py">textFile</span><span class="o">(</span><span class="s">"data/mllib/sample_fpgrowth.txt"</span><span class="o">)</span> |
| |
| <span class="k">val</span> <span class="nv">transactions</span><span class="k">:</span> <span class="kt">RDD</span><span class="o">[</span><span class="kt">Array</span><span class="o">[</span><span class="kt">String</span><span class="o">]]</span> <span class="k">=</span> <span class="nv">data</span><span class="o">.</span><span class="py">map</span><span class="o">(</span><span class="n">s</span> <span class="k">=></span> <span class="nv">s</span><span class="o">.</span><span class="py">trim</span><span class="o">.</span><span class="py">split</span><span class="o">(</span><span class="sc">' '</span><span class="o">))</span> |
| |
| <span class="k">val</span> <span class="nv">fpg</span> <span class="k">=</span> <span class="k">new</span> <span class="nc">FPGrowth</span><span class="o">()</span> |
| <span class="o">.</span><span class="py">setMinSupport</span><span class="o">(</span><span class="mf">0.2</span><span class="o">)</span> |
| <span class="o">.</span><span class="py">setNumPartitions</span><span class="o">(</span><span class="mi">10</span><span class="o">)</span> |
| <span class="k">val</span> <span class="nv">model</span> <span class="k">=</span> <span class="nv">fpg</span><span class="o">.</span><span class="py">run</span><span class="o">(</span><span class="n">transactions</span><span class="o">)</span> |
| |
| <span class="nv">model</span><span class="o">.</span><span class="py">freqItemsets</span><span class="o">.</span><span class="py">collect</span><span class="o">().</span><span class="py">foreach</span> <span class="o">{</span> <span class="n">itemset</span> <span class="k">=></span> |
| <span class="nf">println</span><span class="o">(</span><span class="n">s</span><span class="s">"${itemset.items.mkString("</span><span class="o">[</span><span class="err">"</span>, <span class="err">"</span>,<span class="err">"</span>, <span class="err">"</span><span class="o">]</span><span class="s">")},${itemset.freq}"</span><span class="o">)</span> |
| <span class="o">}</span> |
| |
| <span class="k">val</span> <span class="nv">minConfidence</span> <span class="k">=</span> <span class="mf">0.8</span> |
| <span class="nv">model</span><span class="o">.</span><span class="py">generateAssociationRules</span><span class="o">(</span><span class="n">minConfidence</span><span class="o">).</span><span class="py">collect</span><span class="o">().</span><span class="py">foreach</span> <span class="o">{</span> <span class="n">rule</span> <span class="k">=></span> |
| <span class="nf">println</span><span class="o">(</span><span class="n">s</span><span class="s">"${rule.antecedent.mkString("</span><span class="o">[</span><span class="err">"</span>, <span class="err">"</span>,<span class="err">"</span>, <span class="err">"</span><span class="o">]</span><span class="s">")}=> "</span> <span class="o">+</span> |
| <span class="n">s</span><span class="s">"${rule.consequent .mkString("</span><span class="o">[</span><span class="err">"</span>, <span class="err">"</span>,<span class="err">"</span>, <span class="err">"</span><span class="o">]</span><span class="s">")},${rule.confidence}"</span><span class="o">)</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/scala/org/apache/spark/examples/mllib/SimpleFPGrowth.scala" in the Spark repo.</small></div> |
| |
| </div> |
| |
| <div data-lang="java"> |
| |
| <p><a href="api/java/org/apache/spark/mllib/fpm/FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code></a> implements the |
| FP-growth algorithm. |
| It takes a <code class="language-plaintext highlighter-rouge">JavaRDD</code> of transactions, where each transaction is an <code class="language-plaintext highlighter-rouge">Iterable</code> of items of a generic type. |
| Calling <code class="language-plaintext highlighter-rouge">FPGrowth.run</code> with transactions returns an |
| <a href="api/java/org/apache/spark/mllib/fpm/FPGrowthModel.html"><code class="language-plaintext highlighter-rouge">FPGrowthModel</code></a> |
| that stores the frequent itemsets with their frequencies. The following |
| example illustrates how to mine frequent itemsets and association rules |
| (see <a href="mllib-frequent-pattern-mining.html#association-rules">Association |
| Rules</a> for |
| details) from <code class="language-plaintext highlighter-rouge">transactions</code>.</p> |
| |
| <p>Refer to the <a href="api/java/org/apache/spark/mllib/fpm/FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code> Java docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="kn">import</span> <span class="nn">java.util.Arrays</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.List</span><span class="o">;</span> |
| |
| <span class="kn">import</span> <span class="nn">org.apache.spark.api.java.JavaRDD</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.api.java.JavaSparkContext</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.AssociationRules</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowth</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowthModel</span><span class="o">;</span> |
| |
| <span class="nc">JavaRDD</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">data</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="na">textFile</span><span class="o">(</span><span class="s">"data/mllib/sample_fpgrowth.txt"</span><span class="o">);</span> |
| |
| <span class="nc">JavaRDD</span><span class="o"><</span><span class="nc">List</span><span class="o"><</span><span class="nc">String</span><span class="o">>></span> <span class="n">transactions</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="na">map</span><span class="o">(</span><span class="n">line</span> <span class="o">-></span> <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="n">line</span><span class="o">.</span><span class="na">split</span><span class="o">(</span><span class="s">" "</span><span class="o">)));</span> |
| |
| <span class="nc">FPGrowth</span> <span class="n">fpg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">FPGrowth</span><span class="o">()</span> |
| <span class="o">.</span><span class="na">setMinSupport</span><span class="o">(</span><span class="mf">0.2</span><span class="o">)</span> |
| <span class="o">.</span><span class="na">setNumPartitions</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| <span class="nc">FPGrowthModel</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">model</span> <span class="o">=</span> <span class="n">fpg</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">transactions</span><span class="o">);</span> |
| |
| <span class="k">for</span> <span class="o">(</span><span class="nc">FPGrowth</span><span class="o">.</span><span class="na">FreqItemset</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="nl">itemset:</span> <span class="n">model</span><span class="o">.</span><span class="na">freqItemsets</span><span class="o">().</span><span class="na">toJavaRDD</span><span class="o">().</span><span class="na">collect</span><span class="o">())</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"["</span> <span class="o">+</span> <span class="n">itemset</span><span class="o">.</span><span class="na">javaItems</span><span class="o">()</span> <span class="o">+</span> <span class="s">"], "</span> <span class="o">+</span> <span class="n">itemset</span><span class="o">.</span><span class="na">freq</span><span class="o">());</span> |
| <span class="o">}</span> |
| |
| <span class="kt">double</span> <span class="n">minConfidence</span> <span class="o">=</span> <span class="mf">0.8</span><span class="o">;</span> |
| <span class="k">for</span> <span class="o">(</span><span class="nc">AssociationRules</span><span class="o">.</span><span class="na">Rule</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">rule</span> |
| <span class="o">:</span> <span class="n">model</span><span class="o">.</span><span class="na">generateAssociationRules</span><span class="o">(</span><span class="n">minConfidence</span><span class="o">).</span><span class="na">toJavaRDD</span><span class="o">().</span><span class="na">collect</span><span class="o">())</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span> |
| <span class="n">rule</span><span class="o">.</span><span class="na">javaAntecedent</span><span class="o">()</span> <span class="o">+</span> <span class="s">" => "</span> <span class="o">+</span> <span class="n">rule</span><span class="o">.</span><span class="na">javaConsequent</span><span class="o">()</span> <span class="o">+</span> <span class="s">", "</span> <span class="o">+</span> <span class="n">rule</span><span class="o">.</span><span class="na">confidence</span><span class="o">());</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/java/org/apache/spark/examples/mllib/JavaSimpleFPGrowth.java" in the Spark repo.</small></div> |
| |
| </div> |
| |
| <div data-lang="python"> |
| |
| <p><a href="api/python/reference/api/pyspark.mllib.fpm.FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code></a> implements the |
| FP-growth algorithm. |
| It takes an <code class="language-plaintext highlighter-rouge">RDD</code> of transactions, where each transaction is an <code class="language-plaintext highlighter-rouge">List</code> of items of a generic type. |
| Calling <code class="language-plaintext highlighter-rouge">FPGrowth.train</code> with transactions returns an |
| <a href="api/python/reference/api/pyspark.mllib.fpm.FPGrowthModel.html"><code class="language-plaintext highlighter-rouge">FPGrowthModel</code></a> |
| that stores the frequent itemsets with their frequencies.</p> |
| |
| <p>Refer to the <a href="api/python/reference/api/pyspark.mllib.fpm.FPGrowth.html"><code class="language-plaintext highlighter-rouge">FPGrowth</code> Python docs</a> for more details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="kn">from</span> <span class="nn">pyspark.mllib.fpm</span> <span class="kn">import</span> <span class="n">FPGrowth</span> |
| |
| <span class="n">data</span> <span class="o">=</span> <span class="n">sc</span><span class="p">.</span><span class="n">textFile</span><span class="p">(</span><span class="s">"data/mllib/sample_fpgrowth.txt"</span><span class="p">)</span> |
| <span class="n">transactions</span> <span class="o">=</span> <span class="n">data</span><span class="p">.</span><span class="nb">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="p">.</span><span class="n">strip</span><span class="p">().</span><span class="n">split</span><span class="p">(</span><span class="s">' '</span><span class="p">))</span> |
| <span class="n">model</span> <span class="o">=</span> <span class="n">FPGrowth</span><span class="p">.</span><span class="n">train</span><span class="p">(</span><span class="n">transactions</span><span class="p">,</span> <span class="n">minSupport</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span> <span class="n">numPartitions</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="n">model</span><span class="p">.</span><span class="n">freqItemsets</span><span class="p">().</span><span class="n">collect</span><span class="p">()</span> |
| <span class="k">for</span> <span class="n">fi</span> <span class="ow">in</span> <span class="n">result</span><span class="p">:</span> |
| <span class="k">print</span><span class="p">(</span><span class="n">fi</span><span class="p">)</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/python/mllib/fpgrowth_example.py" in the Spark repo.</small></div> |
| |
| </div> |
| |
| </div> |
| |
| <h2 id="association-rules">Association Rules</h2> |
| |
| <div class="codetabs"> |
| <div data-lang="scala"> |
| <p><a href="api/scala/org/apache/spark/mllib/fpm/AssociationRules.html">AssociationRules</a> |
| implements a parallel rule generation algorithm for constructing rules |
| that have a single item as the consequent.</p> |
| |
| <p>Refer to the <a href="api/java/org/apache/spark/mllib/fpm/AssociationRules.html"><code class="language-plaintext highlighter-rouge">AssociationRules</code> Scala docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="k">import</span> <span class="nn">org.apache.spark.mllib.fpm.AssociationRules</span> |
| <span class="k">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowth.FreqItemset</span> |
| |
| <span class="k">val</span> <span class="nv">freqItemsets</span> <span class="k">=</span> <span class="nv">sc</span><span class="o">.</span><span class="py">parallelize</span><span class="o">(</span><span class="nc">Seq</span><span class="o">(</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="s">"a"</span><span class="o">),</span> <span class="mi">15L</span><span class="o">),</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="s">"b"</span><span class="o">),</span> <span class="mi">35L</span><span class="o">),</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="s">"a"</span><span class="o">,</span> <span class="s">"b"</span><span class="o">),</span> <span class="mi">12L</span><span class="o">)</span> |
| <span class="o">))</span> |
| |
| <span class="k">val</span> <span class="nv">ar</span> <span class="k">=</span> <span class="k">new</span> <span class="nc">AssociationRules</span><span class="o">()</span> |
| <span class="o">.</span><span class="py">setMinConfidence</span><span class="o">(</span><span class="mf">0.8</span><span class="o">)</span> |
| <span class="k">val</span> <span class="nv">results</span> <span class="k">=</span> <span class="nv">ar</span><span class="o">.</span><span class="py">run</span><span class="o">(</span><span class="n">freqItemsets</span><span class="o">)</span> |
| |
| <span class="nv">results</span><span class="o">.</span><span class="py">collect</span><span class="o">().</span><span class="py">foreach</span> <span class="o">{</span> <span class="n">rule</span> <span class="k">=></span> |
| <span class="nf">println</span><span class="o">(</span><span class="n">s</span><span class="s">"[${rule.antecedent.mkString("</span><span class="o">,</span><span class="s">")}=>${rule.consequent.mkString("</span><span class="o">,</span><span class="s">")} ]"</span> <span class="o">+</span> |
| <span class="n">s</span><span class="s">" ${rule.confidence}"</span><span class="o">)</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/scala/org/apache/spark/examples/mllib/AssociationRulesExample.scala" in the Spark repo.</small></div> |
| |
| </div> |
| |
| <div data-lang="java"> |
| <p><a href="api/java/org/apache/spark/mllib/fpm/AssociationRules.html">AssociationRules</a> |
| implements a parallel rule generation algorithm for constructing rules |
| that have a single item as the consequent.</p> |
| |
| <p>Refer to the <a href="api/java/org/apache/spark/mllib/fpm/AssociationRules.html"><code class="language-plaintext highlighter-rouge">AssociationRules</code> Java docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="kn">import</span> <span class="nn">java.util.Arrays</span><span class="o">;</span> |
| |
| <span class="kn">import</span> <span class="nn">org.apache.spark.api.java.JavaRDD</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.api.java.JavaSparkContext</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.AssociationRules</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowth</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.FPGrowth.FreqItemset</span><span class="o">;</span> |
| |
| <span class="nc">JavaRDD</span><span class="o"><</span><span class="nc">FPGrowth</span><span class="o">.</span><span class="na">FreqItemset</span><span class="o"><</span><span class="nc">String</span><span class="o">>></span> <span class="n">freqItemsets</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="na">parallelize</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o"><>(</span><span class="k">new</span> <span class="nc">String</span><span class="o">[]</span> <span class="o">{</span><span class="s">"a"</span><span class="o">},</span> <span class="mi">15L</span><span class="o">),</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o"><>(</span><span class="k">new</span> <span class="nc">String</span><span class="o">[]</span> <span class="o">{</span><span class="s">"b"</span><span class="o">},</span> <span class="mi">35L</span><span class="o">),</span> |
| <span class="k">new</span> <span class="nc">FreqItemset</span><span class="o"><>(</span><span class="k">new</span> <span class="nc">String</span><span class="o">[]</span> <span class="o">{</span><span class="s">"a"</span><span class="o">,</span> <span class="s">"b"</span><span class="o">},</span> <span class="mi">12L</span><span class="o">)</span> |
| <span class="o">));</span> |
| |
| <span class="nc">AssociationRules</span> <span class="n">arules</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">AssociationRules</span><span class="o">()</span> |
| <span class="o">.</span><span class="na">setMinConfidence</span><span class="o">(</span><span class="mf">0.8</span><span class="o">);</span> |
| <span class="nc">JavaRDD</span><span class="o"><</span><span class="nc">AssociationRules</span><span class="o">.</span><span class="na">Rule</span><span class="o"><</span><span class="nc">String</span><span class="o">>></span> <span class="n">results</span> <span class="o">=</span> <span class="n">arules</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">freqItemsets</span><span class="o">);</span> |
| |
| <span class="k">for</span> <span class="o">(</span><span class="nc">AssociationRules</span><span class="o">.</span><span class="na">Rule</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">rule</span> <span class="o">:</span> <span class="n">results</span><span class="o">.</span><span class="na">collect</span><span class="o">())</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span> |
| <span class="n">rule</span><span class="o">.</span><span class="na">javaAntecedent</span><span class="o">()</span> <span class="o">+</span> <span class="s">" => "</span> <span class="o">+</span> <span class="n">rule</span><span class="o">.</span><span class="na">javaConsequent</span><span class="o">()</span> <span class="o">+</span> <span class="s">", "</span> <span class="o">+</span> <span class="n">rule</span><span class="o">.</span><span class="na">confidence</span><span class="o">());</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/java/org/apache/spark/examples/mllib/JavaAssociationRulesExample.java" in the Spark repo.</small></div> |
| |
| </div> |
| </div> |
| |
| <h2 id="prefixspan">PrefixSpan</h2> |
| |
| <p>PrefixSpan is a sequential pattern mining algorithm described in |
| <a href="https://doi.org/10.1109%2FTKDE.2004.77">Pei et al., Mining Sequential Patterns by Pattern-Growth: The |
| PrefixSpan Approach</a>. We refer |
| the reader to the referenced paper for formalizing the sequential |
| pattern mining problem.</p> |
| |
| <p><code class="language-plaintext highlighter-rouge">spark.mllib</code>’s PrefixSpan implementation takes the following parameters:</p> |
| |
| <ul> |
| <li><code class="language-plaintext highlighter-rouge">minSupport</code>: the minimum support required to be considered a frequent |
| sequential pattern.</li> |
| <li><code class="language-plaintext highlighter-rouge">maxPatternLength</code>: the maximum length of a frequent sequential |
| pattern. Any frequent pattern exceeding this length will not be |
| included in the results.</li> |
| <li><code class="language-plaintext highlighter-rouge">maxLocalProjDBSize</code>: the maximum number of items allowed in a |
| prefix-projected database before local iterative processing of the |
| projected database begins. This parameter should be tuned with respect |
| to the size of your executors.</li> |
| </ul> |
| |
| <p><strong>Examples</strong></p> |
| |
| <p>The following example illustrates PrefixSpan running on the sequences |
| (using same notation as Pei et al):</p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <(12)3> |
| <1(32)(12)> |
| <(12)5> |
| <6> |
| </code></pre></div></div> |
| |
| <div class="codetabs"> |
| <div data-lang="scala"> |
| |
| <p><a href="api/scala/org/apache/spark/mllib/fpm/PrefixSpan.html"><code class="language-plaintext highlighter-rouge">PrefixSpan</code></a> implements the |
| PrefixSpan algorithm. |
| Calling <code class="language-plaintext highlighter-rouge">PrefixSpan.run</code> returns a |
| <a href="api/scala/org/apache/spark/mllib/fpm/PrefixSpanModel.html"><code class="language-plaintext highlighter-rouge">PrefixSpanModel</code></a> |
| that stores the frequent sequences with their frequencies.</p> |
| |
| <p>Refer to the <a href="api/scala/org/apache/spark/mllib/fpm/PrefixSpan.html"><code class="language-plaintext highlighter-rouge">PrefixSpan</code> Scala docs</a> and <a href="api/scala/org/apache/spark/mllib/fpm/PrefixSpanModel.html"><code class="language-plaintext highlighter-rouge">PrefixSpanModel</code> Scala docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="k">import</span> <span class="nn">org.apache.spark.mllib.fpm.PrefixSpan</span> |
| |
| <span class="k">val</span> <span class="nv">sequences</span> <span class="k">=</span> <span class="nv">sc</span><span class="o">.</span><span class="py">parallelize</span><span class="o">(</span><span class="nc">Seq</span><span class="o">(</span> |
| <span class="nc">Array</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Array</span><span class="o">(</span><span class="mi">3</span><span class="o">)),</span> |
| <span class="nc">Array</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="nc">Array</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Array</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">)),</span> |
| <span class="nc">Array</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Array</span><span class="o">(</span><span class="mi">5</span><span class="o">)),</span> |
| <span class="nc">Array</span><span class="o">(</span><span class="nc">Array</span><span class="o">(</span><span class="mi">6</span><span class="o">))</span> |
| <span class="o">),</span> <span class="mi">2</span><span class="o">).</span><span class="py">cache</span><span class="o">()</span> |
| <span class="k">val</span> <span class="nv">prefixSpan</span> <span class="k">=</span> <span class="k">new</span> <span class="nc">PrefixSpan</span><span class="o">()</span> |
| <span class="o">.</span><span class="py">setMinSupport</span><span class="o">(</span><span class="mf">0.5</span><span class="o">)</span> |
| <span class="o">.</span><span class="py">setMaxPatternLength</span><span class="o">(</span><span class="mi">5</span><span class="o">)</span> |
| <span class="k">val</span> <span class="nv">model</span> <span class="k">=</span> <span class="nv">prefixSpan</span><span class="o">.</span><span class="py">run</span><span class="o">(</span><span class="n">sequences</span><span class="o">)</span> |
| <span class="nv">model</span><span class="o">.</span><span class="py">freqSequences</span><span class="o">.</span><span class="py">collect</span><span class="o">().</span><span class="py">foreach</span> <span class="o">{</span> <span class="n">freqSequence</span> <span class="k">=></span> |
| <span class="nf">println</span><span class="o">(</span> |
| <span class="n">s</span><span class="s">"${freqSequence.sequence.map(_.mkString("</span><span class="o">[</span><span class="err">"</span>, <span class="err">"</span>, <span class="err">"</span>, <span class="err">"</span><span class="o">]</span><span class="s">")).mkString("</span><span class="o">[</span><span class="err">"</span>, <span class="err">"</span>, <span class="err">"</span>, <span class="err">"</span><span class="o">]</span><span class="s">")},"</span> <span class="o">+</span> |
| <span class="n">s</span><span class="s">" ${freqSequence.freq}"</span><span class="o">)</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/scala/org/apache/spark/examples/mllib/PrefixSpanExample.scala" in the Spark repo.</small></div> |
| |
| </div> |
| |
| <div data-lang="java"> |
| |
| <p><a href="api/java/org/apache/spark/mllib/fpm/PrefixSpan.html"><code class="language-plaintext highlighter-rouge">PrefixSpan</code></a> implements the |
| PrefixSpan algorithm. |
| Calling <code class="language-plaintext highlighter-rouge">PrefixSpan.run</code> returns a |
| <a href="api/java/org/apache/spark/mllib/fpm/PrefixSpanModel.html"><code class="language-plaintext highlighter-rouge">PrefixSpanModel</code></a> |
| that stores the frequent sequences with their frequencies.</p> |
| |
| <p>Refer to the <a href="api/java/org/apache/spark/mllib/fpm/PrefixSpan.html"><code class="language-plaintext highlighter-rouge">PrefixSpan</code> Java docs</a> and <a href="api/java/org/apache/spark/mllib/fpm/PrefixSpanModel.html"><code class="language-plaintext highlighter-rouge">PrefixSpanModel</code> Java docs</a> for details on the API.</p> |
| |
| <div class="highlight"><pre class="codehilite"><code><span class="kn">import</span> <span class="nn">java.util.Arrays</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.List</span><span class="o">;</span> |
| |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.PrefixSpan</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.spark.mllib.fpm.PrefixSpanModel</span><span class="o">;</span> |
| |
| <span class="nc">JavaRDD</span><span class="o"><</span><span class="nc">List</span><span class="o"><</span><span class="nc">List</span><span class="o"><</span><span class="nc">Integer</span><span class="o">>>></span> <span class="n">sequences</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="na">parallelize</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span> |
| <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">3</span><span class="o">)),</span> |
| <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">)),</span> |
| <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">),</span> <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">5</span><span class="o">)),</span> |
| <span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="mi">6</span><span class="o">))</span> |
| <span class="o">),</span> <span class="mi">2</span><span class="o">);</span> |
| <span class="nc">PrefixSpan</span> <span class="n">prefixSpan</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">PrefixSpan</span><span class="o">()</span> |
| <span class="o">.</span><span class="na">setMinSupport</span><span class="o">(</span><span class="mf">0.5</span><span class="o">)</span> |
| <span class="o">.</span><span class="na">setMaxPatternLength</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> |
| <span class="nc">PrefixSpanModel</span><span class="o"><</span><span class="nc">Integer</span><span class="o">></span> <span class="n">model</span> <span class="o">=</span> <span class="n">prefixSpan</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">sequences</span><span class="o">);</span> |
| <span class="k">for</span> <span class="o">(</span><span class="nc">PrefixSpan</span><span class="o">.</span><span class="na">FreqSequence</span><span class="o"><</span><span class="nc">Integer</span><span class="o">></span> <span class="nl">freqSeq:</span> <span class="n">model</span><span class="o">.</span><span class="na">freqSequences</span><span class="o">().</span><span class="na">toJavaRDD</span><span class="o">().</span><span class="na">collect</span><span class="o">())</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">freqSeq</span><span class="o">.</span><span class="na">javaSequence</span><span class="o">()</span> <span class="o">+</span> <span class="s">", "</span> <span class="o">+</span> <span class="n">freqSeq</span><span class="o">.</span><span class="na">freq</span><span class="o">());</span> |
| <span class="o">}</span></code></pre></div> |
| <div><small>Find full example code at "examples/src/main/java/org/apache/spark/examples/mllib/JavaPrefixSpanExample.java" in the Spark repo.</small></div> |
| |
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