weka.core.Instances.attribute()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中weka.core.Instances.attribute()方法的一些代码示例，展示了Instances.attribute()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Instances.attribute()方法的具体详情如下：
包路径：weka.core.Instances
类名称：Instances
方法名：attribute

Instances.attribute介绍

[英]Returns an attribute.
[中]返回一个属性。

代码示例

代码示例来源：origin: stackoverflow.com

System.out.println("--------------------------");
double[] instanceValue1 = new double[dataRaw.numAttributes()];
instanceValue1[0] = dataRaw.attribute(0).addStringValue("This is a string!");
instanceValue1[1] = 0;
System.out.println("--------------------------");
double[] instanceValue2 = new double[dataRaw.numAttributes()];
instanceValue2[0] = dataRaw.attribute(0).addStringValue("This is second string!");
instanceValue2[1] = 1;

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

public int getNode(String sNodeName) {
 int iNode = 0;
 while (iNode < m_root.m_bayesNet.m_Instances.numAttributes()) {
  if (m_root.m_bayesNet.m_Instances.attribute(iNode).name()
   .equals(sNodeName)) {
   return iNode;
  }
  iNode++;
 }
 // throw new Exception("Could not find node [[" + sNodeName + "]]");
 return -1;
}

代码示例来源：origin: Waikato/weka-trunk

public StringValue(int index) {
 super(index);
 assert dataset.attribute(index).isString()
  || dataset.attribute(index).isNominal();
}

代码示例来源：origin: net.sf.meka.thirdparty/mulan

private void checkLabelsConsistency(Instances dataSet, Set<LabelNode> rootLabelNodes) throws InvalidDataFormatException {
  // create an index for faster access to attribute based on name
  Map<String, Attribute> attributesIndex = new HashMap<String, Attribute>();
  for (int index = 0; index < dataSet.numAttributes(); index++) {
    Attribute attribute = dataSet.attribute(index);
    attributesIndex.put(attribute.name(), attribute);
  }
  int numInstances = dataSet.numInstances();
  for (int index = 0; index < numInstances; index++) {
    Instance instance = dataSet.instance(index);
    for (LabelNode labelNode : rootLabelNodes) {
      checkSubtreeConsistency(labelNode, instance, true, attributesIndex);
    }
  }
}

代码示例来源：origin: Waikato/weka-trunk

/**
 * Set the output format. Takes the current average class values and
 * m_InputFormat and calls setOutputFormat(Instances) appropriately.
 */
private void setOutputFormat() {
 Instances newData;
 ArrayList<Attribute> newAtts = new ArrayList<Attribute>(getInputFormat()
  .numAttributes());
 for (int j = 0; j < getInputFormat().numAttributes(); j++) {
  Attribute att = getInputFormat().attribute(j);
  if (!att.isNominal() || !m_AttIndex.isInRange(j)) {
   newAtts.add(att);
  } else {
   Attribute newAtt = new Attribute(att.name(), (ArrayList<String>) null);
   newAtt.setWeight(getInputFormat().attribute(j).weight());
   newAtts.add(newAtt);
  }
 }
 // Construct new header
 newData = new Instances(getInputFormat().relationName(), newAtts, 0);
 newData.setClassIndex(getInputFormat().classIndex());
 setOutputFormat(newData);
}

代码示例来源：origin: nz.ac.waikato.cms.weka/NNge

/**
 * Updates the minimum, maximum, sum, sumSquare values for all the attributes 
 * 
 * @param instance the new instance
 */
private void updateMinMax(Instance instance){
 for (int j = 0; j < m_Train.numAttributes(); j++) {
  if(m_Train.classIndex() == j || m_Train.attribute(j).isNominal())
 continue;
  if (instance.value(j) < m_MinArray[j]) 
 m_MinArray[j] = instance.value(j);
  if (instance.value(j) > m_MaxArray[j])
 m_MaxArray[j] = instance.value(j);
 }    
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/** Need to remove attributes that are not nominal/numeric */
protected void setUp() throws Exception {
 super.setUp();
 
 // remove attributes that are not nominal/numeric
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (   (    !m_Instances.attribute(i).isNominal()
       && !m_Instances.attribute(i).isNumeric() )
     || m_Instances.attribute(i).isDate() )
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

public void testTypical() {
 Instances result = useFilter();
 // Number of attributes and instances shouldn't change
 assertEquals(m_Instances.numAttributes(), result.numAttributes());
 assertEquals(m_Instances.numInstances(), result.numInstances());
 
 assertTrue(!m_Instances.relationName().equals(result.relationName()));
 for (int i = 0; i < m_Instances.numAttributes(); i++) {
  Attribute inatt = m_Instances.attribute(i);
  Attribute outatt = result.attribute(i);
  if (!inatt.isString() && !inatt.isDate()) {
   assertTrue("Attribute names should be changed",
       !inatt.name().equals(outatt.name()));
   if (inatt.isNominal()) {
    assertEquals("Number of nominal values shouldn't change",
           inatt.numValues(), outatt.numValues());
    for (int j = 0; j < inatt.numValues(); j++) {
     assertTrue("Nominal labels should be changed",
         !inatt.value(j).equals(outatt.value(j)));
    }
   }
  }
 }
}

代码示例来源：origin: Stratio/wikipedia-parser

public GroupFeature(List<FeatureExtractor> features) {
  this.features = ImmutableList.copyOf(features);
  ImmutableList.Builder<Attribute> result = ImmutableList.builder();
  for (FeatureExtractor fe: this.features) {
    for (Attribute att: fe.attributes()) {
      result.add((Attribute)att.copy());
    }
  }
  _attributes = result.build();
  _instances = new Instances("FOO", newArrayList(_attributes), 0);
  result = ImmutableList.builder();
  for (int i = 0; i < _instances.numAttributes(); i++) {
    result.add(_instances.attribute(i));
  }
  _attributes = result.build();
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/**
 * Returns true if all attribute weights are the same and false otherwise. Returns true if there are no attributes.
 * The class attribute (if set) is skipped when this test is performed.
 */
public boolean allAttributeWeightsIdentical() {
 boolean foundOne = false;
 double weight = 0;
 for (int i = 0; i < numAttributes(); i++) {
  if (i != classIndex()) {
   if (foundOne && (attribute(i).weight() != weight)) {
    return false;
   } else if (!foundOne) {
    foundOne = true;
    weight = attribute(i).weight();
   }
  }
 }
 return true;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

public void testTypical2() {
 m_Filter = getFilter("3-4");
 Instances result = useFilter();
 assertEquals(m_Instances.numAttributes(), result.numAttributes());
 for (int i = 0; i < result.numAttributes(); i++) {
  if (i != 2) {
   assertEquals(m_Instances.attribute(i).type(), result.attribute(i).type());
   assertEquals(m_Instances.attribute(i).name(), result.attribute(i).name());
  } else {
   assertEquals(Attribute.NOMINAL, result.attribute(i).type());
   assertEquals(1, result.attribute(i).numValues());
  }
 }
}

代码示例来源：origin: net.sf.meka/meka

public static final String toDebugString(Instances D) {
  int L = D.classIndex();
  StringBuilder sb = new StringBuilder();  
  sb.append("D="+D.numInstances());
  sb.append(" L="+L+" {");
  for(int j = 0; j < L; j++) {
    sb.append(D.attribute(j).name()+" ");
  }
  sb.append("}");
  return sb.toString();
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/**
 * Initialize with data from the step
 */
protected void initialize() {
 m_stringInstances = ((DataGrid) getStepToEdit()).getData();
 m_listModel = new DefaultListModel<>();
 m_list.setModel(m_listModel);
 if (m_stringInstances != null && m_stringInstances.length() > 0) {
  try {
   Instances insts = new Instances(new StringReader(m_stringInstances));
   for (int i = 0; i < insts.numAttributes(); i++) {
    Attribute a = insts.attribute(i);
    String nomOrDate = "";
    if (a.isNominal()) {
     for (int j = 0; j < a.numValues(); j++) {
      nomOrDate += a.value(j) + ",";
     }
     nomOrDate = nomOrDate.substring(0, nomOrDate.length() - 1);
    } else if (a.isDate()) {
     nomOrDate = a.getDateFormat();
    }
    AttDef def = new AttDef(a.name(), a.type(), nomOrDate);
    m_listModel.addElement(def);
   }
   m_viewerPanel.setInstances(insts);
  } catch (Exception ex) {
   showErrorDialog(ex);
  }
 }
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

public void testTypical() {
 m_Filter = getFilter();
 Instances result = useFilter();
 assertEquals(m_Instances.numAttributes(), result.numAttributes());
 assertEquals(m_Instances.numInstances(), result.numInstances());
 // the discretized attribute must be nominal
 assertTrue(result.attribute(m_AttIndex).isNominal());
}

代码示例来源：origin: net.sf.meka.thirdparty/mulan

protected void buildInternal(MultiLabelInstances mlData) throws Exception {
  Instances transformedData;
  transformation = new LabelPowersetTransformation();
  debug("Transforming the training set.");
  transformedData = transformation.transformInstances(mlData);
  //debug("Transformed training set: \n + transformedData.toString());
  // check for unary class
  debug("Building single-label classifier.");
  if (transformedData.attribute(transformedData.numAttributes() - 1).numValues() > 1) {
    baseClassifier.buildClassifier(transformedData);
  }
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/**
 * Tests default setup.
 */
public void testTypical() {
 Instances result = useFilter();
 // Number of attributes and instances shouldn't change
 assertEquals(m_Instances.numAttributes(), result.numAttributes());
 assertEquals(m_Instances.numInstances(), result.numInstances());
 Attribute mergedAtt = result.attribute(4);
 // All values should be merged for this attribute
 assertTrue("Attribute 5 has all values merged in result", mergedAtt
  .value(0).equals("a_or_b_or_c_or_d"));
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/**
 * Tests that ordering didn't change.
 */
public void testUnchangedOrder() {
 m_Filter = getFilter(SortLabels.SORT_CASESENSITIVE, "first-last");
 testBuffered();
 Instances result = performTest();
 for (int i = 0; i < m_Instances.attribute(2).numValues(); i++)
  assertEquals("Values differ for index #" + (i+1), m_Instances.attribute(2).value(i), result.attribute(2).value(i));
}

代码示例来源：origin: Waikato/meka

/**
 * jPMF - Joint PMF.
 * @return the joint PMF of the j-th and k-th labels in D.
 */
public static double[][] jPMF(Instances D, int j, int k) {
  double JOINT[][] = new double[D.attribute(j).numValues()][D.attribute(k).numValues()];
  int N = D.numInstances();
  for(int i = 0; i < N; i++) {
    int v_j = (int)Math.round(D.instance(i).value(j));
    int v_k = (int)Math.round(D.instance(i).value(k));
    JOINT[v_j][v_k] += (1.0 / (double)N);
  }
  return JOINT;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/**
 * Set the output format. Takes the current average class values and
 * m_InputFormat and calls setOutputFormat(Instances) appropriately.
 */
private void setOutputFormat() {
 Instances newData;
 ArrayList<Attribute> newAtts = new ArrayList<Attribute>(getInputFormat()
  .numAttributes());
 for (int j = 0; j < getInputFormat().numAttributes(); j++) {
  Attribute att = getInputFormat().attribute(j);
  if (!att.isNominal() || !m_AttIndex.isInRange(j)) {
   newAtts.add(att);
  } else {
   Attribute newAtt = new Attribute(att.name(), (ArrayList<String>) null);
   newAtt.setWeight(getInputFormat().attribute(j).weight());
   newAtts.add(newAtt);
  }
 }
 // Construct new header
 newData = new Instances(getInputFormat().relationName(), newAtts, 0);
 newData.setClassIndex(getInputFormat().classIndex());
 setOutputFormat(newData);
}

代码示例来源：origin: nz.ac.waikato.cms.weka/distributedWekaBase

public static List<String>
 instanceHeaderToAttributeNameList(Instances header) {
 List<String> attNames = new ArrayList<String>();
 for (int i = 0; i < header.numAttributes(); i++) {
  attNames.add(header.attribute(i).name());
 }
 return attNames;
}

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