code: def is_classifier(estimator):
      """Returns True if the given estimator is (probably) a classifier."""
      return getattr(estimator, "_estimator_type", None) == "classifier"
  
imports: import copy
  import warnings
  import numpy
  from scipy import sparse
  from .externals import six
  from .utils.fixes import signature
  from .utils.deprecation import deprecated
  from .exceptions import ChangedBehaviorWarning
  from .None import __version__
label_desc: Use image node_id 4 for calling a global function with example usage: is_classifier(estimator) and returns: unknown