docs: protected void initializeAttributeIndices() {
      //m_AttributeIndices.setUpper(m_Data.numAttributes() - 1);
      m_ActiveIndices = new boolean[m_Data.numAttributes()];
      for (int i = 0; i < m_ActiveIndices.length; i++)
        m_ActiveIndices[i] = true; //m_AttributeIndices.isInRange(i);
    }