python - Naive base classifier of nltk giving unhashable type error -

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following code wrote using nltk , python. 

import nltk import random nltk.corpus import movie_reviews #from sklearn.naive_bayes import gaussiannb documents = [(list(movie_reviews.words(fileid)), category)     category in movie_reviews.categories()     fileid in movie_reviews.fileids(category)]  random.shuffle(documents)  #print(documents[1:3])   all_words= [] w in movie_reviews.words():     all_words.append(w.lower())  all_words = nltk.freqdist(all_words) #print(all_words.most_common(15)) #print(all_words["great"]) word_features = list(all_words.keys())[:3000]  def find_features(document):     words = set(document)     features = {}     w in word_features:         features[w] = {w in words}      return features  #print((find_features(movie_reviews.words('neg/cv000_29416.txt'))))  featuresets = [(find_features(rev), category) (rev, category) in documents]  training_set  = featuresets[:1900] testing_set = featuresets[1900:]  classifier = nltk.naivebayesclassifier.train(training_set) print("naive bayes algo accuracy percent:", (nltk.classify.accuracy(classifier, testing_set))*100) classifier.show_most_informative_features(15)  # clf = gaussiannb() # clf.fit(training_set)

i getting error

traceback (most recent call last): file "naive_bayes_application.py", line 37, in classifier = nltk.naivebayesclassifier.train(training_set) file "c:\users\jshub\anaconda3\lib\site-packages\nltk\classify\naivebayes.py", line 198, in train feature_freqdist[label, fname][fval] += 1 typeerror: unhashable type: 'set'

please help.





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