Tests in Qibo repository fail with AMD ROCm

[mlazzarin]

When using an AMD GPU, the tests in the Qibo repository fail.
On my setup, I get 92 failed tests, in particular:

• rocblas_status_not_implemented errors, related to some linear algebra methods e.g. eigh.
• Assertion errors
• Some Type errors (but they seem to disappear with PR Fix template kernels with ROCm #33).

The tests in this repository are fine, though.

[mlazzarin]

More details:

• rocblas_status_not_implemented errors: they appear when a linear algebra method like eigh or eigvalsh is called.
  I guess this means that rocblas doesn't implement these methods yet.
  Possible solution: fall back to CPU for those particular methods.
• AssertionError: they appear in
  • test_core_measurements.py::test_measurementresult_apply_bitflips
  • test_measurement_gate_probabilistic.py::test_probabilistic_measurement
  • test_measurement_gate_probabilistic.py::test_unbalanced_probabilistic_measurement
  • test_measurement_gate_probabilistic.py::test_post_measurement_bitflips_on_circuit

[scarrazza]

I confirm qibojit tests are passing, but only if I set manually the LLVM_PATH.
The other crashes are due to the different seed/random generator and the missing implementations.

That being said, I believe we can accept this trade-off with the catching exception mechanism you have proposed.

[mlazzarin]

Ok, given that we are planning to move the backend "drivers" from the qibo repository to each backend repo, it may be convenient to wait for that before fixing this issue.

[mlazzarin]

The issue is now fixed, I'll close this issue.