[Octave-bug-tracker] [bug #51779] bsxfun unit tests occasionally fail on certain random inputs

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?51779>

                 Summary: bsxfun unit tests occasionally fail on certain
random inputs
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Thu 17 Aug 2017 05:37:01 PM PDT
                Category: Test Suite
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I see intermittent test failures in the test scripts in
libinterp/corefcn/bsxfun.cc. At least one case that I have captured and
reproduced is due to a call to power with a particularly bad set of
arguments.

A much reduced minimal example that shows the problem operation first:


x = [int32(-5) 0];
y = [single(-0.0226); 0];
assert (bsxfun (@power, y, x), power (y, x))


This is a reduced and simplified version of the following test case that is
actually pulled from the test scripts in bsxfun.cc:


x = [ 2.6, -4.8, 0.3; -2.6, -1.6, -3.4; 1.2, 4.1, 4.9];
y = [-0.0226; 3.6882; -2.3801];
assert (bsxfun (@power, single (y), int32 (x)), power (single (y), int32
(x)))


And I pulled this one data set from an actual test run, as can be shown by
loading the attached file and running the test suite as follows:


load random_states;
rand ("state", rand_state);
test libinterp/corefcn/bsxfun.cc


I can easily pick some arbitrary random state to hardcode into the test
scripts to ensure that this doesn't happen, but maybe someone wants to look at
this further to see if something actually does need fixing, or whether the
random vectors can be constrained better.



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File Attachments:


-------------------------------------------------------
Date: Thu 17 Aug 2017 05:37:01 PM PDT  Name: random_states  Size: 15KiB   By:
mtmiller

<http://savannah.gnu.org/bugs/download.php?file_id=41564>

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