code: def __init__(self, strategy="mean", constant=None, quantile=None):
      super().__init__(
          strategy=strategy,
          constant=constant,
          quantile=quantile,
      )
  
imports: from abc import ABCMeta
  import numpy
  from sklearn.dummy import DummyRegressor
  from sklearn.ensemble._gb_losses import RegressionLossFunction
  from sklearn.utils.extmath import squared_norm
  from ..nonparametric import ipc_weights
  from ._coxph_loss import coxph_loss, coxph_negative_gradient
label_desc: Use image node_id 1 to create a new DummySurvivalEstimator object from inherited base classes: DummyRegressor with example: obj = DummySurvivalEstimator(strategy, constant, quantile)