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POweka.core.UnassignedDatasetException when creating an unlabeled instance
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  1. POweka.core.UnassignedDatasetException when creating an unlabeled instance
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    copied!<p>I trained an IBK classifier with some training data that I created manually as following:</p> <pre><code>ArrayList&lt;Attribute&gt; atts = new ArrayList&lt;Attribute&gt;(); ArrayList&lt;String&gt; classVal = new ArrayList&lt;String&gt;(); classVal.add("C1"); classVal.add("C2"); atts.add(new Attribute("a")); atts.add(new Attribute("b")); atts.add(new Attribute("c")); atts.add(new Attribute("d")); atts.add(new Attribute("@@class@@", classVal)); Instances dataRaw = new Instances("TestInstances", atts, 0); dataRaw.setClassIndex(dataRaw.numAttributes() - 1); double[] instanceValue1 = new double[]{3,0,1,0,0}; dataRaw.add(new DenseInstance(1.0, instanceValue1)); double[] instanceValue2 = new double[]{2,1,1,0,0}; dataRaw.add(new DenseInstance(1.0, instanceValue2)); double[] instanceValue3 = new double[]{2,0,2,0,0}; dataRaw.add(new DenseInstance(1.0, instanceValue3)); double[] instanceValue4 = new double[]{1,3,0,0,1}; dataRaw.add(new DenseInstance(1.0, instanceValue4)); double[] instanceValue5 = new double[]{0,3,1,0,1}; dataRaw.add(new DenseInstance(1.0, instanceValue5)); double[] instanceValue6 = new double[]{0,2,1,1,1}; dataRaw.add(new DenseInstance(1.0, instanceValue6)); </code></pre> <p>Then I build up the classifier:</p> <pre><code>IBk ibk = new IBk(); try { ibk.buildClassifier(dataRaw); } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>I want to create a new instance with unlabeled class and classify this instance, I tried the following with no luck.</p> <pre><code>IBk ibk = new IBk(); try { ibk.buildClassifier(dataRaw); double[] values = new double[]{3,1,0,0,-1}; DenseInstance newInst = new DenseInstance(1.0,values); double classif = ibk.classifyInstance(newInst); System.out.println(classif); } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>I just get the following errors</p> <pre><code>weka.core.UnassignedDatasetException: DenseInstance doesn't have access to a dataset! at weka.core.AbstractInstance.classAttribute(AbstractInstance.java:98) at weka.classifiers.AbstractClassifier.classifyInstance(AbstractClassifier.java:74) at TextCategorizationTest.instancesWithDoubleValues(TextCategorizationTest.java:136) at TextCategorizationTest.main(TextCategorizationTest.java:33) </code></pre> <p>Looks like I am doing something wrong while creating a new instance. How can I create an unlabeled instance exactly ?</p> <p>Thanks in Advance</p>
 

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