[英]Error: Classification metrics can't handle a mix of multiclass-multioutput and multilabel-indicator targets
I am newbie to machine learning in general. 我是机器学习的新手。
I am trying to do multilabel text classification. 我正在尝试做多标签文本分类。 I have the original labels for these documents as well as the result of the classification (used mlknn classifier) represented as one hot encoding (19000 document x 200 label).
我有这些文档的原始标签以及表示为一个热编码(19000文档x 200标签)的分类结果(使用的mlknn分类器)。 Now I am trying to evaluate the classification with f1_score micro and macro but I am getting this error (on line 3)
ValueError: Classification metrics can't handle a mix of multiclass-multioutput and multilabel-indicator targets
and I dont know how I can solve it. 现在我试图用f1_score微观和宏来评估分类,但是我得到了这个错误(第3行)
ValueError: Classification metrics can't handle a mix of multiclass-multioutput and multilabel-indicator targets
,我不知道我怎么能解决这个问题。 This is my code: 这是我的代码:
1. y_true = np.loadtxt("target_matrix.txt")
2. y_pred = np.loadtxt("classification_results.txt")
3. print (f1_score(y_true, y_pred, average='macro'))
4. print (f1_score(y_true, y_pred, average='micro'))
I also tried to use cross_val_score
for the classification to get the evaluation right away but ran into another error (from cross_val_score
line): 我还尝试使用
cross_val_score
进行分类以立即获得评估但遇到另一个错误(来自cross_val_score
行):
File "_csparsetools.pyx", line 20, in scipy.sparse._csparsetools.lil_get1
File "_csparsetools.pyx", line 48, in scipy.sparse._csparsetools.lil_get1
IndexError: column index (11) out of bounds
this is my code: 这是我的代码:
X = np.loadtxt("docvecs.txt", delimiter=",")
y = np.loadtxt("target_matrix.txt", dtype='int')
cv_scores = []
mlknn = MLkNN(k=10)
scores = cross_val_score(mlknn, X, y, cv=5, scoring='f1_micro')
cv_scores.append(scores)
any help with either one of the errors is much appreciated, thanks. 任何一个错误的帮助非常感谢,谢谢。
Can you show the first couple elements of y? 你能展示y的前几个元素吗? Are you using scikit-multilearn?
你在使用scikit-multilearn吗? Also, if you can please use the 0.1.0 release candidate of scikit-multilearn, there second error is most likely a bug that was fixed in master, and a new version is planned for release in a couple of days.
另外,如果你可以请使用scikit-multilearn的0.1.0版本候选版本,那么第二个错误很可能是在master中修复的错误,并且计划在几天内发布新版本。
You can get the master via pip: pip uninstall -y scikit-multilearn pip install https://github.com/scikit-multilearn/scikit-multilearn/archive/master.zip
你可以通过pip获得master:
pip uninstall -y scikit-multilearn pip install https://github.com/scikit-multilearn/scikit-multilearn/archive/master.zip
I was creating the y array manually and it seems that was my mistake. 我手动创建了y数组,这似乎是我的错误。 I used now
MultiLabelBinarizer
to create it, as the following example and now it works: 我现在使用
MultiLabelBinarizer
创建它,如下例所示,现在它可以工作:
train_foo = [['sci-fi', 'thriller'],['comedy'],['sci-fi', 'thriller'],['comedy']]
mlb = MultiLabelBinarizer()
mlb_label_train = mlb.fit_transform(train_foo)
X = np.loadtxt("docvecs.txt", delimiter=",")
cv_scores = []
mlknn = MLkNN(k=3)
scores = cross_val_score(mlknn, X, mlb_label_train, cv=5, scoring='f1_macro')
cv_scores.append(scores)
you can find the documentation for MultiLabelBinarizer
here . 你可以在这里找到
MultiLabelBinarizer
的文档。
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