sign descent seems to do better than adamw? #488
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adamw:
step 5000: train loss 0.6171, val loss 1.6973
iter 5000: loss 0.8138, time 31669.98ms, mfu 4.02%
sign descent:
step 5000: train loss 1.0883, val loss 1.4821
iter 5000: loss 1.1968, time 34425.73ms, mfu 3.27%