class_docstr: Base class for Bivariate spline s(x,y) interpolation on the rectangle
  [xb,xe] x [yb, ye] calculated from a given set of data points
  (x,y,z).
  
  See Also
  --------
  bisplrep :
      a function to find a bivariate B-spline representation of a surface
  bisplev :
      a function to evaluate a bivariate B-spline and its derivatives
  BivariateSpline :
      a base class for bivariate splines.
  SphereBivariateSpline :
      a bivariate spline on a spherical grid
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docstr: Return spline coefficients.
docstr_tok: ["Return","spline","coefficients","."]
code: def get_coeffs(self):
      """Return spline coefficients."""
      return self.tck[2]
  
imports: import warnings
  from numpy import zeros, concatenate, ravel, diff, array, ones
  import numpy
  from .None import fitpack
  from .None import dfitpack
label_desc: Use image node_id 3 for calling the _BivariateSplineBase obj's underlying member method code with example usage: obj.get_coeffs() and returns: self