class_docstr: :class:`CandidateSelector` that never returns any candidates.
class_docstr_tok: [":","class",":","`","CandidateSelector","`","that","never","returns","any","candidates","."]
code: def fit(self, ratings, **kwarsg):
      self.dtype_ = ratings["item"].dtype
  
imports: import logging
  from collections.abc import Iterable, Sequence
  import pandas
  import numpy
  from ..data import sparse_ratings
  from .None import Predictor, Recommender, CandidateSelector
  from ..util import derivable_rng
  from .bias import Bias
  from .ranking import TopN
label_desc: Use image node_id 1 for calling the EmptyCandidateSelector obj's underlying member method code with example usage: obj.fit(ratings) without return types