Hessian

class Hessian(hess_method='param_shift', **kwargs)

Bases: qiskit.opflow.gradients.hessian_base.HessianBase

Compute the Hessian of an expected value.

Parameters

• hess_method (Union[str, CircuitGradient]) – The method used to compute the state/probability gradient. Can be either 'param_shift' or 'lin_comb' or 'fin_diff'. Ignored for gradients w.r.t observable parameters.

• kwargs (dict) – Optional parameters for a CircuitGradient

Raises

ValueError – If method != fin_diff and epsilon is not None.

Methods Defined Here

convert	type operator OperatorBase
get_hessian	Get the Hessian for the given operator w.r.t.

Attributes

hess_method

Returns CircuitGradient.

Return type

CircuitGradient

Returns

CircuitGradient.