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我目前使用CountVectorizer
设置了分类器MultinomialNB()
,用于从文本文档中提取特征,尽管这很有效,但我希望使用相同的方法预测前3-4名的标签,而不仅仅是最上面的标签。sklearn - 根据文本文档预测多标签分类中的前3-4个标签
主要原因是有c.90标签和数据输入不是很好,导致最高估计的精度为35%。如果我可以向用户提供3-4个最有可能的标签作为建议,那么我可以显着提高准确度覆盖率。
有什么建议吗?任何指针将不胜感激!
当前的代码如下所示:
import numpy
import pandas as pd
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.naive_bayes import MultinomialNB
from sklearn.pipeline import Pipeline
from sklearn.cross_validation import KFold
from sklearn.metrics import confusion_matrix, accuracy_score
df = pd.read_csv("data/corpus.csv", sep=",", encoding="latin-1")
df = df.set_index('id')
df.columns = ['class', 'text']
data = df.reindex(numpy.random.permutation(df.index))
pipeline = Pipeline([
('count_vectorizer', CountVectorizer(ngram_range=(1, 2))),
('classifier', MultinomialNB())
])
k_fold = KFold(n=len(data), n_folds=6, shuffle=True)
for train_indices, test_indices in k_fold:
train_text = data.iloc[train_indices]['text'].values
train_y = data.iloc[train_indices]['class'].values.astype(str)
test_text = data.iloc[test_indices]['text'].values
test_y = data.iloc[test_indices]['class'].values.astype(str)
pipeline.fit(train_text, train_y)
predictions = pipeline.predict(test_text)
confusion = confusion_matrix(test_y, predictions)
accuracy = accuracy_score(test_y, predictions)
print accuracy
伟大 - 不知道这会是这么简单... – koend