[英]How to pickle sklearn Pipeline object?
我正在嘗試保存管道。 我不能。 這是我的 class object,我已經嘗試過酸洗。
class SentimentModel():
def __init__(self,model_instance,x_train,x_test,y_train,y_test):
import string
from nltk import ngrams
self.ngrams = ngrams
self.string = string
self.model = model_instance
self.x_train = x_train
self.x_test = x_test
self.y_train = y_train
self.y_test = y_test
self._fit()
def _fit(self):
from sklearn.pipeline import Pipeline
from sklearn.feature_extraction.text import TfidfTransformer
from sklearn.feature_extraction.text import CountVectorizer
self.pipeline = Pipeline([
('bow', CountVectorizer(analyzer=self._text_process)),
('tfidf', TfidfTransformer()),
('classifier', self.model),
])
self.pipeline.fit(self.x_train,self.y_train)
self.preds = self.pipeline.predict(self.x_test)
def _text_process(self,text):
def remove_non_ascii(text):
return ''.join(i for i in text if ord(i)<128)
text = remove_non_ascii(text)
text = [char.lower() for char in text if char not in self.string.punctuation]
text = ''.join(text)
unigrams = [word for word in text.split()]
bigrams = [' '.join(g) for g in self.ngrams(unigrams,2)]
trigrams = [' '.join(g) for g in self.ngrams(unigrams,3)]
tokens = []
tokens.extend(unigrams+bigrams+trigrams)
return tokens
def predict(self,observation):
return self.pipeline.predict(observation)
我得到這些錯誤:
from sklearn.naive_bayes import MultinomialNB
nb = MultinomialNB()
nb_model = SentimentModel(nb,X_train,X_test,y_train,y_test)
import pickle
with open('nb_model1.pkl','wb') as f:
pickle.dump(nb_model,f)
>>>
TypeError: can't pickle module objects
同樣地:
with open('nb_model1.pkl','wb') as f:
pickle.dump(nb_model.pipeline,f)
TypeError: can't pickle module objects
但是,我可以保存nb_model.model
。 但不是管道 object。這是什么解釋? 如何讓我的整個管道持續存在?
我已經看到如何腌制 sklearn 管道中的各個步驟? ,但問題是,它不能 pickle bow
屬性。
joblib.dump(nb_model.pipeline.get_params()['tfidf'], 'nb_tfidf.pkl') # pass
joblib.dump(nb_model.pipeline.get_params()['bow'], 'nb_bow.pkl') # fail
joblib.dump(nb_model.pipeline.get_params()['classifier'], 'nb_classifier.pkl') #pass
>>>
TypeError: can't pickle module objects
我應該怎么辦?
再試一次,不要在 class 定義中導入模塊。 這不是一個好的做法,因為當你導入諸如import string
之類的東西時,你將一整套第三方代碼帶到你的代碼中,而這些代碼甚至可能沒有安裝在另一台想要使用這個 pickle 的機器上; 這不是一個好習慣。 也許pickle
是在保護你做這種事。
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