error

[gratefulbuaa]

when I try the following example:

from scikits.crab.models import MatrixPreferenceDataModel

Build the model

model = MatrixPreferenceDataModel(movies.data)

from scikits.crab.metrics import pearson_correlation
from scikits.crab.similarities import UserSimilarity

Build the similarity

similarity = UserSimilarity(model, pearson_correlation)

from crab.recommenders.knn import UserBasedRecommender

Build the User based recommender

recommender = UserBasedRecommender(model, similarity, with_preference=True)

Recommend items for the user 5 (Toby)

recommender.recommend(5)

there is AttributeError:

---

AttributeError Traceback (most recent call last)
in ()
----> 1 recommender.recommend(5)

anaconda/lib/python2.7/site-packages/scikits/crab/recommenders/knn/classes.pyc in recommend(self, user_id, how_many, **params)
598 '''
599
--> 600 self._set_params(**params)
601
602 candidate_items = self.all_other_items(user_id, **params)

AttributeError: 'UserBasedRecommender' object has no attribute '_set_params'

I didn't find a function named "_set_params".
Can you give some suggestions how to solve this?