yuya/megatron t5 xnli eval

[yaoyu-33]

What does this PR do ?

Add megatron t5 xnli eval only script - it takes in finetuned checkpoint and output test results on test dataset.

Collection: [Note which collection this PR will affect]

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# Add a code snippet demonstrating how to use this 

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Additional Information

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[MaximumEntropy]

LGTM!

[lgtm-com]

This pull request introduces 2 alerts when merging 248977b into 22fca0a - view on LGTM.com

new alerts:

• 2 for Unused import

[lgtm-com]

This pull request introduces 2 alerts when merging ee6c556 into 22fca0a - view on LGTM.com

new alerts:

• 2 for Unused import