NumPy warnings parallel test fidelity probe

warning_probe.py

import subprocess

trials = 20
pass_counts = 0
fail_counts = 0

for i in range(trials):
    print("trial number:", i)
    try:
        o = subprocess.check_output('python runtests.py -t "numpy/testing/tests/test_utils.py" -- -n 4', shell=True)
    except subprocess.CalledProcessError as exc:
        o = exc.output
    if b'FAILURES' in o:
        fail_counts += 1
    else:
        pass_counts += 1

print("pass_counts", pass_counts)
print("fail_counts", fail_counts)
print("trials", trials)