qiskit.aqua.operators.gradients.Hessian.convert

Hessian.convert(operator, params=None)

Parameters

• operator (OperatorBase) – The operator for which we compute the Hessian

• params (Union[Tuple[ParameterExpression, ParameterExpression], List[Tuple[ParameterExpression, ParameterExpression]], List[ParameterExpression], ParameterVector, None]) – The parameters we are computing the Hessian with respect to Either give directly the tuples/list of tuples for which the second order derivative is to be computed or give a list of parameters to build the full Hessian for those parameters.

Returns

An operator whose evaluation yields the Hessian

Return type

OperatorBase

Raises

ValueError – If params is not set.