docstr: How many degrees of freedom used in the fit?
  
  self.trace()
docstr_tok: ["How","many","degrees","of","freedom","used","in","the","fit","?","self.trace","(",")"]
code: def df_fit(self):
      """
      How many degrees of freedom used in the fit?
  
      self.trace()
      """
      return self.trace()
  
imports: import numpy
  import numpy.linalg
  from scipy.linalg import solveh_banded
  from scipy.optimize import golden
  from models import _hbspline
  import warnings
label_desc: Use image node_id 5 for calling the SmoothingSpline obj's underlying member method code with example usage: obj.df_fit() and returns: self