Mallet HMM 训练问题

发布于 2024-12-12 13:45:38 字数 680 浏览 3 评论 0原文

我目前正在努力解决 Mallet 关于 HMM 的极其糟糕的文档。我已经设法将数据导入到实例中（改编自 ImportExample.java 片段），我只是想知道如何使用它们来训练 HMM 模型。我首先创建一个 HMM 实例，但我不确定是否要这样做：

 HMM hmm = new HMM(instances.getDataAlphabet(),instances.getTargetAlphabet());

或者使用相同的数据字母表两次，如下所示：

 HMM hmm = new HMM(instances.getDataAlphabet(),instances.getDataAlphabet());

不管怎样，当我到达时

 hmm.train(实例);

我收到以下错误：

cc.mallet.types.FeatureVector 无法转换为 cc.mallet.types.FeatureVectorSequence

如果您能提供任何帮助，我将不胜感激。

干杯

原文

I am struggling at the moment with Mallet's ridiculously poor documentation regarding HMMs. I have managed to import the data into instances(adapted from the ImportExample.java snippet) and I was just wondering how they can be used to train an HMM model.
I first started by creating an HMM instance but I wasn't sure whether to go for:

    HMM hmm = new HMM(instances.getDataAlphabet(), instances.getTargetAlphabet());

Or use the same data alphabet twice like so:

    HMM hmm = new HMM(instances.getDataAlphabet(), instances.getDataAlphabet());

Either way when I get to

    hmm.train(instances);

I get the following error:

cc.mallet.types.FeatureVector cannot be cast to
cc.mallet.types.FeatureVectorSequence

I would be grateful for any help you can provide.

Cheers

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月下凄凉 2024-12-19 13:45:38

我已经设法解决了这个特定问题，并认为它可能对遇到同样问题的其他人有用。 mallet 中的示例包中有一个解决方案： http://hg-iesl.cs.umass.edu/hg/mallet/file/83adf71b0824/src/cc/mallet/examples/TrainHMM.java

主要问题与如何您通过管道导入了数据。另外，据我所知，如果您的数据采用这种格式，它会有所帮助：

TOKEN  TAG 
TOKEN  TAG

我假设您可以拥有 TOKEN 和 TAG 之间的功能，但我不能 100% 确定。如果有人知道有关在 mallet 中使用 HMM 的任何好的示例和文档，请告诉我。

I have managed to solve this particular problem and thought it may be useful to others with the same problem. There is a solution within the examples package in mallet: http://hg-iesl.cs.umass.edu/hg/mallet/file/83adf71b0824/src/cc/mallet/examples/TrainHMM.java

The main problem was related to how you imported the data through the pipe. Also from what I can tell it helps if you data is in this format:

TOKEN  TAG 
TOKEN  TAG

I assuming you can have features in between the TOKEN and TAG but am not a 100% sure. If anyone knows of any good examples and documentation about using HMM within mallet, please let me know.

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