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  1. Data Management
  2. DM-23630

fgcmcal failure Ubuntu

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    Description

      fgcmcal fails on master with the latest conda environment on Ubuntu 18.04.4. The failure is in one of the new tests comparing the `photoCalib.getCalibrationErr()` with the `fgcmZptGrayErr`:

      tests/test_fgcmcal_hsc.py:154: 
      _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
      tests/fgcmcalTestBase.py:407: in _testFgcmOutputProducts
          (np.log(10.0)/2.5)*testCal.getCalibrationMean()*fgcmZptGrayErr)
      ../../stack/Linux64/utils/19.0.0-7-g686a884+2/python/lsst/utils/tests.py:656: in assertFloatsAlmostEqual
          testCase.assertFalse(failed, msg="\n".join(errMsg))
      E   AssertionError: True is not false : 1/1 elements differ with rtol=2.220446049250313e-16, atol=2.220446049250313e-16
      E   0.00223844323512219 != 0.0022384434 (diff=2.3283064e-10/0.0022384434=1.0401453e-07)
      

      We are not seeing this on other machines (CentOS, macOS), so there's probably a "fun" interaction with system libraries going on here. Adding rtol=2e-7, atol=None to the above test prevents the error, but may not be the actual solution we want. This suggests to me that there's a float32 calculation going on under the hood somewhere.

      I can provide an Ubuntu account to test on.

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              erykoff Eli Rykoff
              Parejkoj John Parejko
              John Parejko
              Eli Rykoff, John Parejko, John Swinbank, Krzysztof Findeisen
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