num_dual.partial_hessian
- num_dual.partial_hessian(f, x, y)
 Calculate the Hessian of a scalar function w.r.t. a subset of its variables.
Parameters
- fcallable
 A scalar, multivariate function.
- x[float]
 The first vector for which the partial Hessian is evaluated.
- y[float]
 The second vector for which the partial Hessian is evaluated.
Returns
function value, gradient w.r.t. x, gradient w.r.t. y, and partial Hessian