[Test] pt-nightly-hf-mlm-roberta-b-pre-conv-v2-8-1vm without functionalization

[ManfeiBai]

Description

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Tests

Please describe the tests that you ran on TPUs to verify changes.

Instruction and/or command lines to reproduce your tests: ...

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Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run one-shot tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.

[alanwaketan]

@ManfeiBai You can try one shot tests here:

ml-testing-accelerators/tests/README.md

Line 36 in 583e71a

## Running a One Shot Test

just to validate the test run. No need to wait until it finishes to see the result.

[alanwaketan]

Can we have a new tpuVm (tpuVmNoFunc) setup that inherits tpuVm and only use that for "hf_lm + v2_8 + roberta_base_pre"?

You can see how pjrt doest it: https://github.com/GoogleCloudPlatform/ml-testing-accelerators/blob/master/tests/pytorch/nightly/resnet50-mp.libsonnet#L188

@will-cromar Feel free to chime in.

[will-cromar]

Will you be using it in other tests? If it's just for this file, we can add a mixin here that sets this variable, e.g.

noFunctionalization:: {
  tpuSettings+: {
    tpuvmExports+: |||
       XLA_DISABLE_FUNCTIONALIZATION=1
    |||
  }
}

The correct place to set environment variables for these tests is tpuVmExports+. The use of .bash_profile is probably just historical baggage.

If it's shared by other tests, feel free to add this field to common instead.