default use_nesterov to false for Muon (#65)

Signed-off-by: Hao Wu <[email protected]>

Author: skyw

emerging_optimizers/orthogonalized_optimizers/muon.py

@@ -64,7 +64,7 @@ def __init__(
         params: ParamsT,
         lr: float = 3e-4,
         momentum_beta: float = 0.95,
-        use_nesterov: bool = True,
+        use_nesterov: bool = False,
         weight_decay: float = 0.01,
         use_decoupled_weight_decay: bool = True,
         fp32_matmul_prec: str = "medium",