public static ConfusionMatrix readResult( FileSystem fs, Path pathPattern, Configuration conf, Parameters params) throws IOException { StringTuple key = new StringTuple(); DoubleWritable value = new DoubleWritable(); String defaultLabel = params.get("defaultCat"); FileStatus[] outputFiles = fs.globStatus(pathPattern); Map<String, Map<String, Integer>> confusionMatrix = new HashMap<String, Map<String, Integer>>(); for (FileStatus fileStatus : outputFiles) { Path path = fileStatus.getPath(); SequenceFile.Reader reader = new SequenceFile.Reader(fs, path, conf); while (reader.next(key, value)) { String correctLabel = key.stringAt(1); String classifiedLabel = key.stringAt(2); Map<String, Integer> rowMatrix = confusionMatrix.get(correctLabel); if (rowMatrix == null) { rowMatrix = new HashMap<String, Integer>(); } Integer count = Double.valueOf(value.get()).intValue(); rowMatrix.put(classifiedLabel, count); confusionMatrix.put(correctLabel, rowMatrix); } } ConfusionMatrix matrix = new ConfusionMatrix(confusionMatrix.keySet(), defaultLabel); for (Map.Entry<String, Map<String, Integer>> correctLabelSet : confusionMatrix.entrySet()) { Map<String, Integer> rowMatrix = correctLabelSet.getValue(); for (Map.Entry<String, Integer> classifiedLabelSet : rowMatrix.entrySet()) { matrix.addInstance(correctLabelSet.getKey(), classifiedLabelSet.getKey()); matrix.putCount( correctLabelSet.getKey(), classifiedLabelSet.getKey(), classifiedLabelSet.getValue()); } } return matrix; }