私は、PythonでBuilding Machine Learning Systemsの第6章を読んで、ツイッターデータの感情分析をしようとしています。GridSearchCV.fit()はTypeErrorを返します:予想されるシーケンスまたは配列のようなもの、見積もりを受け取りました
私は、データセットを使用しています:https://raw.githubusercontent.com/zfz/twitter_corpus/master/full-corpus.csv
それは推定量としてTFIDFのベクトル化と単純ベイズ分類器のパイプラインを使用しています。
次に、見積もりに最適なパラメータを見つけるためにGridSearchCV()を使用しています。次のように
コードは次のとおり
from load_data import load_data
from sklearn.cross_validation import ShuffleSplit
from sklearn.grid_search import GridSearchCV
from sklearn.metrics import f1_score
from sklearn.naive_bayes import MultinomialNB
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.pipeline import Pipeline
def pipeline_tfidf_nb():
tfidf_vect = TfidfVectorizer(analyzer = "word")
naive_bayes_clf = MultinomialNB()
return Pipeline([('vect', tfidf_vect),('nbclf',naive_bayes_clf)])
input_file = "full-corpus.csv"
X,y = load_data(input_file)
print X.shape,y.shape
clf = pipeline_tfidf_nb()
cv = ShuffleSplit(n = len(X), test_size = .3, n_iter = 1, random_state = 0)
clf_param_grid = dict(vect__ngram_range = [(1,1),(1,2),(1,3)],
vect__min_df = [1,2],
vect__smooth_idf = [False, True],
vect__use_idf = [False, True],
vect__sublinear_tf = [False, True],
vect__binary = [False, True],
nbclf__alpha = [0, 0.01, 0.05, 0.1, 0.5, 1],
)
grid_search = GridSearchCV(estimator = clf, param_grid = clf_param_grid, cv = cv, scoring = f1_score)
grid_search.fit(X, y)
print grid_search.best_estimator_
LOAD_DATA()は、正または負の感情を持つCSVファイルから値を抽出します。
Xは文字列(TweetText)の配列で、yはbool値の配列です(肯定的な感情の場合はTrue)。私はyのXを再形成しようとした
runfile('C:/Users/saurabh.s1/Downloads/Python_ml/ch6/main.py', wdir='C:/Users/saurabh.s1/Downloads/Python_ml/ch6')
Reloaded modules: load_data
negative : 572
positive : 519
(1091,) (1091,)
Traceback (most recent call last):
File "<ipython-input-25-823b07c4ff26>", line 1, in <module>
runfile('C:/Users/saurabh.s1/Downloads/Python_ml/ch6/main.py', wdir='C:/Users/saurabh.s1/Downloads/Python_ml/ch6')
File "C:\anaconda2\lib\site-packages\spyder\utils\site\sitecustomize.py", line 866, in runfile
execfile(filename, namespace)
File "C:\anaconda2\lib\site-packages\spyder\utils\site\sitecustomize.py", line 87, in execfile
exec(compile(scripttext, filename, 'exec'), glob, loc)
File "C:/Users/saurabh.s1/Downloads/Python_ml/ch6/main.py", line 31, in <module>
grid_search.fit(X, y)
File "C:\anaconda2\lib\site-packages\sklearn\grid_search.py", line 804, in fit
return self._fit(X, y, ParameterGrid(self.param_grid))
File "C:\anaconda2\lib\site-packages\sklearn\grid_search.py", line 553, in _fit
for parameters in parameter_iterable
File "C:\anaconda2\lib\site-packages\sklearn\externals\joblib\parallel.py", line 800, in __call__
while self.dispatch_one_batch(iterator):
File "C:\anaconda2\lib\site-packages\sklearn\externals\joblib\parallel.py", line 658, in dispatch_one_batch
self._dispatch(tasks)
File "C:\anaconda2\lib\site-packages\sklearn\externals\joblib\parallel.py", line 566, in _dispatch
job = ImmediateComputeBatch(batch)
File "C:\anaconda2\lib\site-packages\sklearn\externals\joblib\parallel.py", line 180, in __init__
self.results = batch()
File "C:\anaconda2\lib\site-packages\sklearn\externals\joblib\parallel.py", line 72, in __call__
return [func(*args, **kwargs) for func, args, kwargs in self.items]
File "C:\anaconda2\lib\site-packages\sklearn\cross_validation.py", line 1550, in _fit_and_score
test_score = _score(estimator, X_test, y_test, scorer)
File "C:\anaconda2\lib\site-packages\sklearn\cross_validation.py", line 1606, in _score
score = scorer(estimator, X_test, y_test)
File "C:\anaconda2\lib\site-packages\sklearn\metrics\classification.py", line 639, in f1_score
sample_weight=sample_weight)
File "C:\anaconda2\lib\site-packages\sklearn\metrics\classification.py", line 756, in fbeta_score
sample_weight=sample_weight)
File "C:\anaconda2\lib\site-packages\sklearn\metrics\classification.py", line 956, in precision_recall_fscore_support
y_type, y_true, y_pred = _check_targets(y_true, y_pred)
File "C:\anaconda2\lib\site-packages\sklearn\metrics\classification.py", line 72, in _check_targets
check_consistent_length(y_true, y_pred)
File "C:\anaconda2\lib\site-packages\sklearn\utils\validation.py", line 173, in check_consistent_length
uniques = np.unique([_num_samples(X) for X in arrays if X is not None])
File "C:\anaconda2\lib\site-packages\sklearn\utils\validation.py", line 112, in _num_samples
'estimator %s' % x)
TypeError: Expected sequence or array-like, got estimator Pipeline(steps=[('vect', TfidfVectorizer(analyzer='word', binary=False, decode_error=u'strict',
dtype=<type 'numpy.int64'>, encoding=u'utf-8', input=u'content',
lowercase=True, max_df=1.0, max_features=None, min_df=1,
ngram_range=(1, 1), norm=u'l2', preprocessor=None,
smooth_i...e_idf=False, vocabulary=None)), ('nbclf', MultinomialNB(alpha=0, class_prior=None, fit_prior=True))])
が、それは動作していない:
エラーです。
さらにデータが必要な場合や、私が何か不足している場合はお知らせください。
ありがとうございます!