code: def _pre_fit_model(self, Ts, E, df):
      self.set_knots(Ts[0], E)
  
file_path: lifelines/examples/crowther_royston_clements_splines.py
imports: import pandas
  from autograd import numpy
  from lifelines.fitters import ParametricRegressionFitter
  from lifelines import WeibullAFTFitter
  from lifelines.fitters.mixins import SplineFitterMixin
  from lifelines.utils.safe_exp import safe_exp
label_desc: Use image node_id 4 for calling the CRCSplineFitter obj's underlying member method code with example usage: obj._pre_fit_model(Ts, E, df) without return types