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Previously we were performing sleep and wakeup in
_prepare_inputs.Now that we're doing it in
_generate_and_score_completionsas of #3492 , we do not need to do it in_prepare_inputsanymore.In fact, doing so would cause double copy of memory resulting in OOM.
Caveat: This might not work for older versions of trl (0.16.0 and 0.17.0 mostly. v0.18 and above should work fine)