qiskit.aqua.operators.gradients.QFIBase.gradient_wrapper¶
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QFIBase.gradient_wrapper(operator, bind_params, grad_params=None, backend=None)¶ Get a callable function which provides the respective gradient, Hessian or QFI for given parameter values. This callable can be used as gradient function for optimizers.
- Parameters
operator (
OperatorBase) – The operator for which we want to get the gradient, Hessian or QFI.bind_params (
Union[ParameterExpression,ParameterVector,List[ParameterExpression]]) – The operator parameters to which the parameter values are assigned.grad_params (
Union[ParameterExpression,ParameterVector,List[ParameterExpression],Tuple[ParameterExpression,ParameterExpression],List[Tuple[ParameterExpression,ParameterExpression]],None]) – The parameters with respect to which we are taking the gradient, Hessian or QFI. If grad_params = None, then grad_params = bind_paramsbackend (
Union[BaseBackend,QuantumInstance,None]) – The quantum backend or QuantumInstance to use to evaluate the gradient, Hessian or QFI.
- Returns
Function to compute a gradient, Hessian or QFI. The function takes an iterable as argument which holds the parameter values.
- Return type
callable(param_values)