code: def before_fit(self, *args, **kwargs):
      self.called_before_fit = True
  
imports: import tests
  import lore.models
  import lore.models.keras
  import lore.estimators.keras
  import tests.mocks.pipelines
label_desc: Use image node_id 2 for calling the SaimeseTwinsClassifier obj's underlying member method code with example usage: obj.before_fit() without return types