pytest Error: tests/test_lkm.py:81: AssertionError

[3dsf]

=== warnings summary ===

tests/test_foreground.py::test_foreground
/home/ferg/git/pymatting/tests/test_foreground.py:31: UserWarning: Tests for GPU implementation skipped, because of missing packages.

I'm on Fedora 31 and here are my pip 3 package versions which above the required dependencies.

Requirement already satisfied: numpy in /usr/lib64/python3.7/site-packages (1.17.4)
Requirement already satisfied: pillow in /usr/lib64/python3.7/site-packages (6.1.0)
Requirement already satisfied: numba in /home/ferg/.local/lib/python3.7/site-packages (0.48.0)
Requirement already satisfied: scipy in /home/ferg/.local/lib/python3.7/site-packages (1.4.1)

[3dsf]

Not on a nvidia gpu; is this the issue?

[99991]

The warning is because no NVIDIA GPU is available, but that is only required for GPU-accelerated foreground estimation with CUDA. You can still use the CPU-implementation. And if you are lucky and can install pyopencl, you can also use the GPU-accelerated OpenCL implementation.

EDIT: The command pip3 install -r requirements_gpu.txt will install the GPU-requirements.

However, the assertion is unrelated to that.

We found a system to reproduce the issue. Which hardware are you using? Maybe there is a common denominator here.

The good news is that the error is only 5.6e-4 when it should be less than 1e-5, so it is still very small and nothing to be concerned about. We have ruled out the matrix inversion and the box filter so far as sources of numerical precision issues.

[liyiying233]

There are some problems at runtime in ubuntu16.04
`================================================================================ test session starts =================================================================================
platform linux -- Python 3.6.4, pytest-5.3.5, py-1.8.1, pluggy-0.13.1
rootdir: /home/liyiying/liyiying/git-project/pymatting
collected 11 items

tests/test_boxfilter.py . [ 9%]
tests/test_cg.py . [ 18%]
tests/test_estimate_alpha.py . [ 27%]
tests/test_foreground.py . [ 36%]
tests/test_ichol.py . [ 45%]
tests/test_kdtree.py . [ 54%]
tests/test_laplacians.py . [ 63%]
tests/test_lkm.py F [ 72%]
tests/test_preconditioners.py . [ 81%]
tests/test_simple_api.py . [ 90%]
tests/test_util.py . [100%]

`

`> assert difference < 1e-5
E assert 5.6514436094818936e-05 < 1e-05

tests/test_lkm.py:56: AssertionError
`

[99991]

We have recently increased the threshold by a small amount. Do the tests pass now?

[99991]

Since there have not been any comments, I'll assume that this issue has been solved.