code: def classes_(self):
      return self.classes
  
imports: from typing import Callable, Optional
  import numpy
  from sklearn.neighbors import KNeighborsClassifier, KNeighborsRegressor
  from fedot.core.operations.evaluation.operation_implementations.implementation_interfaces import ModelImplementation
  from fedot.core.operations.operation_parameters import OperationParameters
label_desc: Use image node_id 4 for calling the FedotKnnClassImplementation obj's underlying member method code with example usage: obj.classes_() and returns: self