sklearn Pipeline fit: Attribute: untere nicht gefunden

Question

Ich möchte eine Pipeline in sklearn verwenden, wie folgt aus:

corpus = load_files('corpus/train') 

stop_words = [x for x in open('stopwords.txt', 'r').read().split('\n')] # Uppercase! 

countvec = CountVectorizer(stop_words=stop_words, ngram_range=(1, 2)) 

X_train, X_test, y_train, y_test = train_test_split(corpus.data, corpus.target, test_size=0.9, 
                random_state=0) 
x_train_counts = countvec.fit_transform(X_train) 
x_test_counts = countvec.transform(X_test) 

k_fold = KFold(n=len(corpus.data), n_folds=6) 
confusion = np.array([[0, 0], [0, 0]]) 

pipeline = Pipeline([ 
    ('vectorizer', CountVectorizer(stop_words=stop_words, ngram_range=(1, 2))), 
    ('classifier', MultinomialNB()) ]) 

for train_indices, test_indices in k_fold: 

    pipeline.fit(x_train_counts, y_train) 
    predictions = pipeline.predict(x_test_counts) 

Allerdings erhalte ich diese Fehlermeldung:

AttributeError: lower not found 

ich ausgesehen haben in diesem Beitrag:

AttributeError: lower not found; using a Pipeline with a CountVectorizer in scikit-learn

aber ich vorbei eine Liste von Bytes an den Vektorizer, so dass das Problem nicht sein sollte.

EDIT

corpus = load_files('corpus') 

stop_words = [x for x in open('stopwords.txt', 'r').read().split('\n')] 

X_train, X_test, y_train, y_test = train_test_split(corpus.data, corpus.target, test_size=0.5, 
                random_state=0) 

k_fold = KFold(n=len(corpus.data), n_folds=6) 
confusion = np.array([[0, 0], [0, 0]]) 

pipeline = Pipeline([ 
    ('vectorizer', CountVectorizer(stop_words=stop_words, ngram_range=(1, 2))), 
    ('classifier', MultinomialNB())]) 

for train_indices, test_indices in k_fold: 
    pipeline.fit(X_train[train_indices], y_train[train_indices]) 
    predictions = pipeline.predict(X_test[test_indices]) 

Jetzt bekomme ich den Fehler:

TypeError: only integer arrays with one element can be converted to an index 

2. EDIT

corpus = load_files('corpus') 

stop_words = [y for x in open('stopwords.txt', 'r').read().split('\n') for y in (x, x.title())] 

k_fold = KFold(n=len(corpus.data), n_folds=6) 
confusion = np.array([[0, 0], [0, 0]]) 

pipeline = Pipeline([ 
    ('vectorizer', CountVectorizer(stop_words=stop_words, ngram_range=(1, 2))), 
    ('classifier', MultinomialNB())]) 

for train_indices, test_indices in k_fold: 
    pipeline.fit(corpus.data, corpus.target) 

Answer 1

Sie sind nicht richtig in die Pipeline verwenden. Sie müssen die Daten nicht vektorisiert weitergeben, die Idee ist, dass die Pipeline die Daten vektorisiert.

# This is done by the pipeline 
# x_train_counts = countvec.fit_transform(X_train) 
# x_test_counts = countvec.transform(X_test) 

k_fold = KFold(n=len(corpus.data), n_folds=6) 
confusion = np.array([[0, 0], [0, 0]]) 

pipeline = Pipeline([ 
    ('vectorizer', CountVectorizer(stop_words=stop_words, ngram_range=(1, 2))), 
    ('classifier', MultinomialNB()) ]) 

# also you are not using the indices... 
for train_indices, test_indices in k_fold: 

    pipeline.fit(corpus.data[train_indices], corpus.target[train_indices]) 
    predictions = pipeline.predict(corpus.data[test_indices])