Quantum code executed multiple times automatically

[Thevendran]

Steps to reproduce the problem

from qiskit_optimization import QuadraticProgram
from qiskit_optimization.algorithms import MinimumEigenOptimizer
from qiskit.algorithms import QAOA
from qiskit.utils import QuantumInstance
from qiskit_braket_provider import AWSBraketProvider

qubo = QuadraticProgram('two-different')
qubo.binary_var('x')
qubo.binary_var('y')
qubo.minimize(linear=[-1, -1], quadratic={('x', 'y'): 2}, constant=1)
print(qubo.prettyprint())

quantum_instance = QuantumInstance(
    backend=AWSBraketProvider().get_backend('dm1'),
    shots=1
)
qaoa_instance = QAOA(quantum_instance=quantum_instance)
qaoa_solver = MinimumEigenOptimizer(qaoa_instance)
result = qaoa_solver.solve(qubo)
print(result.prettyprint())

What is the current behavior?

Code gets executed multiple times (as back-to-back tasks in Braket), before the result returned back to local development environment.

What is the expected behavior?

Expecting the code to be executed just once.

[jcjaskula-aws]

Your code uses an optimizer to minimize a cost function (see the line MinimumEigenOptimizer(qaoa_instance)). The solver will execute your circuit and subsequently update parameters to return the final result. You could use print(result.min_eigen_solver_result) to read the number of circuit evaluations. As it is, this looks to work as intended, which means that indeed many tasks will be executed.