为啥 Mallet 文本分类为所有测试文件输出相同的值 1.0？

Posted 2023-03-13

【中文标题】为啥 Mallet 文本分类为所有测试文件输出相同的值 1.0？

【英文标题】：Why Mallet text classification output the same value 1.0 for all test files?为什么 Mallet 文本分类为所有测试文件输出相同的值 1.0？

【发布时间】：2018-09-13 22:52:12

【问题描述】：

我正在学习 Mallet 文本分类命令行。估计不同类别的输出值都是相同的 1.0。我不知道我错在哪里。你能帮忙吗？

木槌版本：E:\Mallet\mallet-2.0.8RC3

//there is a txt file about cat breed (catmaterial.txt) in cat dir.
//command 1
C:\Users\toshiba>mallet import-dir --input E:\Mallet\testmaterial\cat --output E
:\Mallet\testmaterial\cat.mallet --remove-stopwords

//command 1 output
Labels =
   E:\Mallet\testmaterial\cat

//command 2, save classifier as catClass.classifier
C:\Users\toshiba>mallet train-classifier --input E:\Mallet\testmaterial\cat.mall
et --trainer NaiveBayes --output-classifier E:\Mallet\testmaterial\catClass.clas
sifier

//command 2 output
Training portion = 1.0
Unlabeled training sub-portion = 0.0
Validation portion = 0.0
Testing portion = 0.0

-------------------- Trial 0  --------------------

Trial 0 Training NaiveBayesTrainer with 1 instances
Trial 0 Training NaiveBayesTrainer finished
No examples with predicted label !
No examples with true label !
No examples with predicted label !
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer training data accuracy = 1.0
Trial 0 Trainer NaiveBayesTrainer Test Data Confusion Matrix
No examples with predicted label !
Trial 0 Trainer NaiveBayesTrainer test data precision() = 1.0
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer test data recall() = 1.0
No examples with predicted label !
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer test data F1() = 1.0
Trial 0 Trainer NaiveBayesTrainer test data accuracy = NaN

NaiveBayesTrainer
Summary. train accuracy mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test accuracy mean = NaN stddev = NaN stderr = NaN
Summary. test precision() mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test recall() mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test f1() mean = 1.0 stddev = 0.0 stderr = 0.0

//command 3, estimate classes of the three files about cat, deer and dog. The cat file is the same as the one for cat.mallet
C:\Users\toshiba>mallet classify-dir --input E:\Mallet\testmaterial\test_cat_dir
 --output - --classifier E:\Mallet\testmaterial\catClass.classifier


//command 3 output
file:/E:/Mallet/testmaterial/test_cat_dir/catmaterial.txt               1.0
file:/E:/Mallet/testmaterial/test_cat_dir/deertext.txt          1.0
file:/E:/Mallet/testmaterial/test_cat_dir/dogmaterial.txt               1.0

// why the three classes are all 1.0 ?

C:\Users\toshiba>

你能帮忙吗？ 谢谢。

++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++

更新：

感谢您的回答，但仍然为所有文件输出 1.0。

我的想法是，我将一些狗文件放在狗目录中，并将这些狗文件作为实例，训练模型，然后在 test_dir 中测试一些文件以查看结果。

我根据对您建议的理解尝试了，但仍然输出相同的 1.0。

你能帮我处理下面的命令行吗？

在E:\Mallet\train_dir\dog中，有4个dog txt文件（dog 2.txt, dog4.txt,dog5.txt, dogmaterial.txt）。

在E:\Mallet\test_dir中，有9个txt文件（cat2.txt、catmaterial.txt、deermaterial.txt、dog3.txt、dog6.txt、dog 2.txt、dog4.txt、dog5.txt、 dogmaterial.txt)。

---

C:\Users\toshiba>mallet import-dir --input E:\Mallet\train_dir\dog --output E:\M
allet\classifier_dir\3animal.mallet --remove-stopwords
Labels =
   E:\Mallet\train_dir\dog


C:\Users\toshiba>mallet train-classifier --input E:\Mallet\classifier_dir\3anima
l.mallet --trainer NaiveBayes --output-classifier E:\Mallet\classifier_dir\3anim
alClass.classifier
Training portion = 1.0
Unlabeled training sub-portion = 0.0
Validation portion = 0.0
Testing portion = 0.0                          
-------------------- Trial 0  --------------------

Trial 0 Training NaiveBayesTrainer with 4 instances
Trial 0 Training NaiveBayesTrainer finished
No examples with predicted label !
No examples with true label !
No examples with predicted label !
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer training data accuracy = 1.0
Trial 0 Trainer NaiveBayesTrainer Test Data Confusion Matrix
No examples with predicted label !
Trial 0 Trainer NaiveBayesTrainer test data precision() = 1.0
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer test data recall() = 1.0
No examples with predicted label !
No examples with true label !
Trial 0 Trainer NaiveBayesTrainer test data F1() = 1.0
Trial 0 Trainer NaiveBayesTrainer test data accuracy = NaN

NaiveBayesTrainer
Summary. train accuracy mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test accuracy mean = NaN stddev = NaN stderr = NaN
Summary. test precision() mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test recall() mean = 1.0 stddev = 0.0 stderr = 0.0
Summary. test f1() mean = 1.0 stddev = 0.0 stderr = 0.0


C:\Users\toshiba>mallet classify-dir --input E:\Mallet\test_dir --output - --cla
ssifier E:\Mallet\classifier_dir\3animalClass.classifier

file:/E:/Mallet/test_dir/cat2.txt               1.0
file:/E:/Mallet/test_dir/catmaterial.txt                1.0
file:/E:/Mallet/test_dir/deertext.txt           1.0
file:/E:/Mallet/test_dir/dog%202.txt            1.0
file:/E:/Mallet/test_dir/dog3.txt               1.0
file:/E:/Mallet/test_dir/dog4.txt               1.0
file:/E:/Mallet/test_dir/dog5.txt               1.0
file:/E:/Mallet/test_dir/dog6.txt               1.0
file:/E:/Mallet/test_dir/dogmaterial.txt                1.0
C:\Users\toshiba>

---

谢谢。

【参考方案1】：

有两个输入选项。 input-dir 将目录视为类，将每个目录中的每个文件视为输入实例。 input-file 逐行读取输入文件，并将行内的各个字段视为标签和实例数据。您正在使用 files-in-directories 输入类型，因此您正在创建一个具有一个类和一个实例的分类器。我猜你想要文件中的行类型。