How to get result bitstring data in case of QAOACostFunctionOnQVM?

[eswarthammana]

this module is really helpful. Could you please let me know how to capture the measured results in case of using QAOACostFunctionOnQVM. In the case of Wavefunction simulator there is a get_wavefunction method helps to retrieve the data. But how to see the results incase of QAOACostFunctionOnQVM like the minimum energy related bit string

[eswarthammana]

QAOACostFunctionOnQVM works fine with the pyquil 2.x.x ... with pyquil 3.x.x need to update bitstring capture as qvm.run return QAMExecutionResult

[eswarthammana]

updated the class PrepareAndMeasureOnQVM as

`def __call__(self, params, nshots):
        if nshots is None:
            nshots = self.nshots
        bitstrings = []
        for exe in self.exes:
            result = self.qvm.run(exe)
            bitstring = result.readout_data.get('ro')
            for i in range(nshots - 1):
                result = self.qvm.run(exe)
                new_bits = result.readout_data.get('ro')
                bitstring = np.append(bitstring, new_bits, axis=0)
            bitstrings.append(bitstring)
        out = sampling_expectation(self.hams, bitstrings)
        if self.scalar:
            return out[0]
        else:
            return out`

works with out errors as mentioned in the pyquil migration docs

Please help me how to capture the bitstring with highest amplitudes or probability...

[Q-lds]

Hi @eswarthammana ! Apologies for the delay with which I answer you. This repository is not actively maintained, and that is the reason why entropica_qaoa does not work well with pyquil 3.x.x

However, could you please reach us at [email protected] ? We could tell you a bit more about our upcoming open source project which is soon going to replace entropica_qaoa.

Thanks and take care!

[Q-lds]

@eswarthammana, this project has effectively been incorporated into OpenQAOA.

Head over there if you are still working with QAOA and Rigetti's backends :)