code: def coefficients(self) -> np.ndarray:
      pass
  
imports: from abc import abstractmethod
  from typing import List, Optional
  import numpy
  import pandas
  from sklearn.linear_model._base import LinearModel
  from sklearn.utils.validation import check_is_fitted
  from dowhy.gcm.ml.prediction_model import PredictionModel
  from dowhy.gcm.ml.regression import SklearnRegressionModel
  from dowhy.gcm.shapley import ShapleyConfig, estimate_shapley_values
label_desc: Use image node_id 1 for calling the LinearPredictionModel obj's underlying member method code with example usage: obj.coefficients() without return types