Better error message for lm_eval script

[drisspg]

Summary

Add install instructions and make output printing better

+----------+--------------------------------------------+
| Task     | Metrics                                    |
+==========+============================================+
| wikitext | +-----------------------------+----------+ |
|          | | bits_per_byte,none          | 0.538825 | |
|          | +-----------------------------+----------+ |
|          | | bits_per_byte_stderr,none   | N/A      | |
|          | +-----------------------------+----------+ |
|          | | byte_perplexity,none        | 1.452788 | |
|          | +-----------------------------+----------+ |
|          | | byte_perplexity_stderr,none | N/A      | |
|          | +-----------------------------+----------+ |
|          | | word_perplexity,none        | 7.368333 | |
|          | +-----------------------------+----------+ |
|          | | word_perplexity_stderr,none | N/A      | |
|          | +-----------------------------+----------+ |
+----------+--------------------------------------------+

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/444

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As of commit 5ffe391 with merge base 0725f0b ():
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