예제 #1
0
  /**
   * Signify that this batch of input to the filter is finished. If the filter requires all
   * instances prior to filtering, output() may now be called to retrieve the filtered instances.
   *
   * @return true if there are instances pending output
   * @throws IllegalStateException if no input structure has been defined
   */
  public boolean batchFinished() throws Exception {

    if (getInputFormat() == null) {
      throw new IllegalStateException("No input instance format defined");
    }
    if (m_attStats == null) {
      Instances input = getInputFormat();

      m_attStats = new AttributeStats[input.numAttributes()];

      for (int i = 0; i < input.numAttributes(); i++) {
        if (input.attribute(i).isNumeric() && (input.classIndex() != i)) {
          m_attStats[i] = input.attributeStats(i);
        }
      }

      // Convert pending input instances
      for (int i = 0; i < input.numInstances(); i++) {
        convertInstance(input.instance(i));
      }
    }
    // Free memory
    flushInput();

    m_NewBatch = true;
    return (numPendingOutput() != 0);
  }
예제 #2
0
  /**
   * Input an instance for filtering. Filter requires all training instances be read before
   * producing output.
   *
   * @param instance the input instance
   * @return true if the filtered instance may now be collected with output().
   * @throws IllegalStateException if no input format has been set.
   */
  public boolean input(Instance instance) throws Exception {

    if (getInputFormat() == null) {
      throw new IllegalStateException("No input instance format defined");
    }
    if (m_NewBatch) {
      resetQueue();
      m_NewBatch = false;
    }
    if (m_attStats == null) {
      bufferInput(instance);
      return false;
    } else {
      convertInstance(instance);
      return true;
    }
  }