Lookahead decoding for static attention

[sxu]

Summary: Lookahead decoding helper.

Reviewed By: billmguo

Differential Revision: D78113460

[pytorch-bot]

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❌ 1 New Failure

As of commit d641f28 with merge base dd4488d ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2c32f3af4f8a3587a471951c60bd412e846cc0142e552de14db0b0d80430c383 /exec failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D78113460

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This pull request was exported from Phabricator. Differential Revision: D78113460