enabling logit scaling #221
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enables scaling output logits; similar to a softmax "temperature"
the PaLM paper uses scale 1/sqrt(cfg.d_model) (see Sec 5 Weight initialization)
Implantation notes:
F.cross_entropy does not enable temperature.
Since we'd have to add it to the model anyway, I just made it a buffer so that it'd be part of the model state_dict.