Add test workflow with unittest

[smokestacklightnin]

Changes in this PR:

• Add .gitignore file
• Add unit test GitHub workflow
• Add unittest skips or expectedFailures to tests with errors and failures, respectively

You can get a list of tests with skips or expectedFailures using

$ grep -nr "PR 189" tensorflow_model_analysis

There is one import error that I have not dealt with.

[aktech]

Curious why we skip this on this bot?

[smokestacklightnin]

The testing workflow was configured this way for TFX, and I copied it here.

If we can justify removing that condition, I'm happy to do so.

@embr do you have an opinion here?

[aktech]

Looking at README.md looks like 3.11 is also supported?

[smokestacklightnin]

I vaguely remember an issue with 3.11. I just added it, so we'll see what happens

[smokestacklightnin]

There appears to be a dependencies issue with 3.11.

[aktech]

I am guessing probably because 3.11 would require different version of protobuf-compiler, similar to the different versions of library specified here:

model-analysis/setup.py

Line 308 in 7a068ec

'protobuf>=3.20.3,<5;python_version<"3.11"',

but, either ways it's okay to skip 3.11 in this PR and can be handled later.

[smokestacklightnin]

it's okay to skip 3.11 in this PR and can be handled later.

I'd rather do this than try to make 3.11 work in this PR

[aktech]

Other than the nitpicks, it looks good to me.

[smokestacklightnin]

@embr This PR seems to me to be ready for review and merge. It just adds a testing workflow. I think fixing the failing tests can come from subsequent work.

The test failure is because of an import error. The import refers to code that is "in maintenance mode" and "not available in TFMA OSS". Until the code becomes present in tfma.eval_saved_model, the tests will not pass.