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Id
11073580
data
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0
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CreationDate
2012-06-17T18:01:18.907
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2012-06-21T19:00:52.587
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2012-06-21T19:00:52.587
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367391
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367391
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11070828
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2
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3
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text
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<p>Ok. I found the solution myself. The central part of the solution is the method <code>Instances#insertAttributeAt</code>, which inserts a new attribute as the last one if the second parameter is <code>model.numAttributes()</code>. Here is some example code for numerical attributes. It is easy to adapt to other types of attributes as well:</p> <pre><code> Map<String,String> currentInstanceFeatures = currentInstance.getFeatures(); Instances model = null; try { if (targetFile.exists()) { FileReader in = new FileReader(targetFile); try { BufferedReader reader = new BufferedReader(in); ArffReader arff = new ArffReader(reader); model = arff.getData(); } finally { IOUtils.closeQuietly(in); } } else { FastVector schema = new FastVector(); model = new Instances("model", schema, 1); } Instance newInstance = new SparseInstance(0); newInstance.setDataset(model); for(Map.Entry<String,String> feature:currentInstanceFeatures.entrySet()) { Attribute attribute = model.attribute(feature.getKey()); if (attribute == null) { attribute = new Attribute(feature.getKey()); model.insertAttributeAt(attribute, model.numAttributes()); attribute = model.attribute(feature.getKey()); } newInstance.setValue(attribute, feature.getValue()); } model.add(newInstance); model.compactify(); ArffSaver saver = new ArffSaver(); saver.setInstances(model); saver.setFile(targetFile); LOGGER.debug("Saving dataset to: " + targetFile.getAbsoluteFile()); saver.writeBatch(); } catch (IOException e) { throw new IllegalArgumentException(e); } </code></pre>
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1. POMerge two sparse weka datasets with different but overlapping schema and different amount of Instances
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