Change start/end args

Author: rwightman

timm/optim/kron.py

@@ -116,7 +116,8 @@ def __init__(
         precond_dtype: Optional[torch.dtype] = None,
         decoupled_decay: bool = False,
         flatten: bool = False,
-        flatten_start_end: Tuple[int, int] = (2, -1),
+        flatten_start_dim: int = 2,
+        flatten_end_dim: int = -1,
         deterministic: bool = False,
     ):
         if not has_opt_einsum:
@@ -144,7 +145,8 @@ def __init__(
             precond_dtype=precond_dtype,
             decoupled_decay=decoupled_decay,
             flatten=flatten,
-            flatten_start_end=flatten_start_end,
+            flatten_start_dim=flatten_start_dim,
+            flatten_end_dim=flatten_end_dim,
         )
         super(Kron, self).__init__(params, defaults)
 
@@ -235,7 +237,7 @@ def step(self, closure=None):
 
                 flattened = False
                 if group['flatten']:
-                    grad = safe_flatten(grad, *group["flatten_start_end"])
+                    grad = safe_flatten(grad, group["flatten_start_dim"], group["flatten_end_dim"])
                     flattened = True
 
                 if len(state) == 0: