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QAOAClient

class QAOAClient(optimizer=None, reps=1, initial_state=None, mixer=None, initial_point=None, alpha=1.0, provider=None, backend=None, shots=1024, measurement_error_mitigation=False, callback=None, store_intermediate=False, use_swap_strategies=False, use_initial_mapping=False, use_pulse_efficient=False, optimization_level=None)[source]

Bases: VQEClient

The Qiskit Optimization QAOA Runtime Client.

প্যারামিটার
  • optimizer (Union[Optimizer, Dict[str, Any], None]) -- An optimizer or dictionary specifying a classical optimizer. If a dictionary, only SPSA and QN-SPSA are supported. The dictionary must contain a key name for the name of the optimizer and may contain additional keys for the settings. E.g. {'name': 'SPSA', 'maxiter': 100}. Per default, SPSA is used.

  • reps (int) -- the integer parameter \(p\) as specified in https://arxiv.org/abs/1411.4028, Has a minimum valid value of 1.

  • initial_state (Optional[QuantumCircuit]) -- An optional initial state to prepend the QAOA circuit with

  • mixer (Union[QuantumCircuit, OperatorBase, None]) -- the mixer Hamiltonian to evolve with or a custom quantum circuit. Allows support of optimizations in constrained subspaces as per https://arxiv.org/abs/1709.03489 as well as warm-starting the optimization as introduced in http://arxiv.org/abs/2009.10095.

  • initial_point (Optional[ndarray]) -- An optional initial point (i.e. initial parameter values) for the optimizer. If None a random vector is chosen in the VQE class in Qiskit terra using a uniform distribution.

  • alpha (float) -- The fraction of top measurement samples to be used for the expectation value (CVaR expectation). Defaults to 1, i.e. using all samples to construct the expectation value. This value must be contained in the interval [0, 1].

  • provider (Optional[Provider]) -- The provider.

  • backend (Optional[Backend]) -- The backend to run the circuits on.

  • shots (int) -- The number of shots to be used

  • measurement_error_mitigation (bool) -- Whether or not to use measurement error mitigation.

  • callback (Optional[Callable[[int, ndarray, float, float], None]]) -- a callback that can access the intermediate data during the optimization. Four parameter values are passed to the callback as follows during each evaluation by the optimizer for its current set of parameters as it works towards the minimum. These are: the evaluation count, the optimizer parameters for the ansatz, the evaluated mean and the evaluated standard deviation.

  • store_intermediate (bool) -- Whether or not to store intermediate values of the optimization steps. Per default False.

  • use_swap_strategies (bool) -- A boolean on whether or not to use swap strategies when transpiling. If this is False then the standard transpiler with the given optimization level will run.

  • use_initial_mapping (bool) -- A boolean flag that, if set to True (the default is False), runs a heuristic algorithm to permute the Paulis in the cost operator to better fit the coupling map and the swap strategy. This is only needed when the optimization problem is sparse and when using swap strategies to transpile.

  • use_pulse_efficient (bool) -- A boolean on whether or not to use a pulse-efficient transpilation. If this flag is set to False by default. See https://arxiv.org/abs/2105.01063.

  • optimization_level (Optional[int]) -- The transpiler optimization level to run if the swap strategies are not used. This value defaults to 1 in the QAOA runtime.

রেইজেস

Attributes

alpha

The fraction of best shots to keep.

ansatz

Return the ansatz.

initial_state

Returns: Returns the initial state.

mixer

Returns: Returns the mixer.

optimization_level

Return the optimization level to use if swap strategies are not used.

reps

Returns: Returns the reps.

use_initial_mapping

If True run a permutation of the decision variables to better fit the device.

use_pulse_efficient

If True then a pulse-efficient transpiler pass will run to scale the CR gates.

use_swap_strategies

Whether or not the transpilation will use the swap strategies.

Methods

program_inputs(operator[, aux_operators])

Return the QAOA program inputs