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我很难从 Mallet 开发人员列表中获得帮助，所以我在这里尝试。

我有一个 InstancesList，其目标字母表为 {A, B, C}，我需要将目标字母表更改为 {A, NOT_A} 以进行另一次分析。

到目前为止，我有以下代码（改编自其他 Mallet 源代码），但我不断得到：

字母不匹配：Instance: [5976, null], InstanceList: [5976, 2]

...
InstanceList iListCopy = (InstanceList) instances.clone();

Alphabet blank = new Alphabet();
Alphabet newAlpha = new Alphabet();

//A and NOT_A cannot be found in alphabet, so add them.
newAlpha.lookupIndex("A", true);
newAlpha.lookupIndex("NOT_A", true);

Noop pipe = new Noop(blank, newAlpha);
InstanceList newIList = new InstanceList(pipe);

//iterate through each instance and change the target based on the
original value.
for (int i = 0; i < iListCopy.size(); i++) {
   Instance inst = iListCopy.get(i);

   FeatureVector original = (FeatureVector) inst.getData();
   Instance newInst = pipe.instanceFrom(new Instance(original,
newAlpha, inst.getName(), inst.getSource()));
   if (inst.getLabeling().toString().equals("A") {  
       newInst.setTarget("A");
   } else {
       newInst.setTarget("NOT_A");
   }
   newIList.add(newInst);   //FAILS with "Alphabets do not match."
}
...

有人对我如何将目标字母表从 {A, B, C} 更改为 {A, NOT_A} 有任何建议吗？

4

1 回答 1

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目标应该是一个标签。尝试这个：

..
newInst.setTarget(((LabelAlphabet) newList.getTargetAlphabet()).lookupLabel("A"));
..
newInst.setTarget(((LabelAlphabet) newList.getTargetAlphabet()).lookupLabel("NOT_A"));
于 2012-09-26T14:25:54.423 回答