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test_exhaustive_symmetrization_1q failure in test_operator_estimation.py

See original GitHub issue

test_exhaustive_symmetrization_1q failed when run by semaphoreci for PR #925.

=================================== FAILURES ===================================
______________________ test_exhaustive_symmetrization_1q _______________________

forest = <pyquil.api._base_connection.ForestConnection object at 0x7f6957ab6eb8>

    def test_exhaustive_symmetrization_1q(forest):
        qc = get_qc('9q-qvm')
        qubs = [5]
        n_shots = 2000
        p = Program()
        p00, p11 = 0.90, 0.80
        p.define_noisy_readout(5, p00, p11)
        bs_results, d_qub_idx = _exhaustive_symmetrization(qc, qubs, n_shots, p)
        frac0 = np.count_nonzero(bs_results == 0) / n_shots
        expected_frac0 = (p00 + p11) / 2
    
        assert d_qub_idx == {5: 0}
>       assert np.isclose(frac0, expected_frac0, 2e-2)
E       assert False
E        +  where False = <function isclose at 0x7f6966899a60>(0.8785, 0.8500000000000001, 0.02)
E        +    where <function isclose at 0x7f6966899a60> = np.isclose

pyquil/tests/test_operator_estimation.py:758: AssertionError

Here is a Python repl session replicating the above np.isclose calculation, according to the numpy docs. The last line is meant to show how close/far the test was from passing.

>>> import numpy as np
>>> a = 0.8785
>>> b = 0.8500000000000001
>>> atol = 1e-08
>>> rtol = 2e-2
>>> np.isclose(a, b, rtol)
False
>>> abs(a - b)
0.02849999999999986
>>> atol + rtol * b
0.017000010000000003
>>> abs(a-b) - (atol + rtol * b)
0.011499989999999856

Link to the semaphoreci logs is here: https://semaphoreci.com/rigetti/pyquil/branches/pull-request-925/builds/1