code: def file_extension(self):
      return "baseline"
  
file_path: mljar-supervised/supervised/algorithms/baseline.py
imports: import logging
  import os
  import sklearn
  from sklearn.base import ClassifierMixin, RegressorMixin
  from sklearn.dummy import DummyClassifier, DummyRegressor
  from supervised.algorithms.registry import BINARY_CLASSIFICATION, MULTICLASS_CLASSIFICATION, REGRESSION, AlgorithmsRegistry
  from supervised.algorithms.sklearn import SklearnAlgorithm
  from supervised.utils.config import LOG_LEVEL
label_desc: Use image node_id 2 for calling the BaselineClassifierAlgorithm obj's underlying member method code with example usage: obj.file_extension() and returns: str