LIBMF prediction varys on Mac

[wschin]

The MatrixFactorizationSimpleTrainAndPredict test frequently fails on Mac with the following message. We need to figure out the reason to reduce the number of rebuilds.

Error message

Assert.InRange() Failure
Range: (0.60692207960271 - 0.61692207960271)
Actual: 0.592577526427063
Stack trace at Microsoft.ML.Tests.TrainerEstimators.TrainerEstimators.MatrixFactorizationSimpleTrainAndPredict() in /Users/buildagent/agent/agent/_work/1/s/test/Microsoft.ML.Tests/TrainerEstimators/MatrixFactorizationTests.cs:line 118

[codemzs]

i believe the tests are passing on all flavors now. @wschin please reopen if you feel this issue has not been addressed.

[antoniovs1029]

This test was disabled in #1455 for Mac, but I believe the problem was actually never solved.

Right now this test is also failing in other platforms, and in fact it's the 2nd test that fails the most in our build pipelines.

[frank-dong-ms-zz]

fixed in #5121, close this issue