示例#1
0
  /**
   * Convert a single instance over. The converted instance is added to the end of the output queue.
   *
   * @param instance the instance to convert
   */
  private void convertInstance(Instance instance) {
    Instance inst = null;

    if (instance instanceof SparseInstance) {
      double[] newVals = new double[instance.numAttributes()];
      int[] newIndices = new int[instance.numAttributes()];
      double[] vals = instance.toDoubleArray();
      int ind = 0;
      for (int j = 0; j < instance.numAttributes(); j++) {
        double value;
        if (instance.attribute(j).isNumeric()
            && (!Instance.isMissingValue(vals[j]))
            && (getInputFormat().classIndex() != j)) {

          value = vals[j] - m_Means[j];
          if (value != 0.0) {
            newVals[ind] = value;
            newIndices[ind] = j;
            ind++;
          }
        } else {
          value = vals[j];
          if (value != 0.0) {
            newVals[ind] = value;
            newIndices[ind] = j;
            ind++;
          }
        }
      }
      double[] tempVals = new double[ind];
      int[] tempInd = new int[ind];
      System.arraycopy(newVals, 0, tempVals, 0, ind);
      System.arraycopy(newIndices, 0, tempInd, 0, ind);
      inst = new SparseInstance(instance.weight(), tempVals, tempInd, instance.numAttributes());
    } else {
      double[] vals = instance.toDoubleArray();
      for (int j = 0; j < getInputFormat().numAttributes(); j++) {
        if (instance.attribute(j).isNumeric()
            && (!Instance.isMissingValue(vals[j]))
            && (getInputFormat().classIndex() != j)) {
          vals[j] = (vals[j] - m_Means[j]);
        }
      }
      inst = new Instance(instance.weight(), vals);
    }

    inst.setDataset(instance.dataset());

    push(inst);
  }
示例#2
0
  /** Computes the difference between two given attribute values. */
  protected double difference(int index, double val1, double val2) {

    switch (m_instances.attribute(index).type()) {
      case Attribute.NOMINAL:

        // If attribute is nominal
        if (Instance.isMissingValue(val1)
            || Instance.isMissingValue(val2)
            || ((int) val1 != (int) val2)) {
          return 1;
        } else {
          return 0;
        }
      case Attribute.NUMERIC:

        // If attribute is numeric
        if (Instance.isMissingValue(val1) || Instance.isMissingValue(val2)) {
          if (Instance.isMissingValue(val1) && Instance.isMissingValue(val2)) {
            return 1;
          } else {
            double diff;
            if (Instance.isMissingValue(val2)) {
              diff = norm(val1, index);
            } else {
              diff = norm(val2, index);
            }
            if (diff < 0.5) {
              diff = 1.0 - diff;
            }
            return diff;
          }
        } else {
          return norm(val1, index) - norm(val2, index);
        }
      default:
        return 0;
    }
  }