HessianBase

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

Bases: qiskit.opflow.gradients.derivative_base.DerivativeBase

Base class for 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.

Attributes

hess_method