Return a tuple (tx,ty) where tx,ty contain knots positions of the spline with respect to x-, y-variable, respectively. The position of interior and additional knots are given as
t[k+1:-k-1] and t[:k+1]=b, t[-k-1:]=e, respectively.
scipy.interpolate.SmoothBivariateSpline.get_coeffs
scipy.interpolate.SmoothBivariateSpline.get_residual
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