[EZ] Check for stable outputs

[PaliC]

Fixes: #71 and #70

For checking for ones and zeros and noting that in the dataset, I think there should be a followup PR to #57

[msaroufim]

stable/unstable to me means numerically stable or unstable. In this case I believe better terminology would be constant output functions such as full, zeros, ones

And the other problem is degenerate benchmarks where for instance torch.matmul(A,B) has A and B mostly 0 so the output is always 0

Note that it's fine if a single example in the benchmark is degenerate, the problem is if all of them are

[PaliC]

@msaroufim are you saying its fine if a single test in the op is degenerate, however, if all of the tests are degenerate then we should axe it. I think filtering at a test by test level would end up achieving the same thing, and remove the degenerate tests as well.

[msaroufim]

Yup maybe warning for degenerate input when benchmarking for now is sufficient. Input includes lots of 0, NaN, constant value for everything