code: def _fit(self, X, y, init_params=True):
      pass
  
file_path: mlxtend/mlxtend/_base/tests/test_regressor.py
imports: import numpy
  from mlxtend._base import _BaseModel, _Regressor
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 2 for calling the BlankRegressor obj's underlying member method code with example usage: obj._fit(X, y, init_params) without return types