refactor code for split group

internlm/train/utils.py

@@ -8,12 +8,24 @@ def split_params_into_different_groups_for_optimizer(param_groups: Tuple[Dict])
     Compatiable with muiltiple param groups, each should have a name
 
     Args:
-        param_groups (Tuple[Dict]):
-            The list of parameter groups to split
+        param_groups (Tuple[Dict]): The list of parameter groups to split
+        Input Example:
+        >>> (
+        >>>     {'name': 'default', 'params': [tensor], 'weight_decay' :xxx},
+        >>>     ...,
+        >>> )
 
     Returns:
-        Tuple[Dict]:
-        list of fp16/fp32 groups for optimizer
+        Tuple[Dict]: list of params groups for optimizer
+        Output Example:
+        >>> (
+        >>>     {'name': 'default','params': [tensor],'weight_decay' :xxx},
+        >>>     {'name': 'default_fp32', 'params': [tensor],'weight_decay' :xxx},
+        >>>     ...,
+        >>> )
+
+    Returns:
+        Tuple[Dict]: list of fp16/fp32 groups for optimizer
     """
     if isinstance(param_groups, tuple):
         param_groups = list(param_groups)  # Tuple cannot be modified
@@ -22,22 +34,13 @@ def split_params_into_different_groups_for_optimizer(param_groups: Tuple[Dict])
     elif not isinstance(param_groups, list):
         raise ValueError(f"Unknown param group type of {type(param_groups)}")
 
-    new_groups = {}
+    new_groups = []
     for pgroup in param_groups:
-        new_groups[pgroup["name"]] = {}
-        new_groups[pgroup["name"]]["fp32"] = {}
-
-        # Create fp32 groups and copy origin attribute
-        fp32_group = new_groups[pgroup["name"]]["fp32"]
-        fp32_group["name"] = pgroup["name"] + "_fp32"
-        # copy attribute for fp32 group
+        fp32_group = {"name": pgroup["name"] + "_fp32", "params": []}
+        # copy attribute from origin group
         for ori_key in pgroup.keys():
-            if ori_key != "name":
-                if ori_key == "params":
-                    fp32_group[ori_key] = []
-                else:
-                    fp32_group[ori_key] = pgroup[ori_key]
-
+            if ori_key not in ("name", "params"):
+                fp32_group[ori_key] = pgroup[ori_key]
         # Assign param
         origin_params = []
         for param in pgroup["params"]:
@@ -45,13 +48,12 @@ def split_params_into_different_groups_for_optimizer(param_groups: Tuple[Dict])
                 fp32_group["params"].append(param)
             else:
                 origin_params.append(param)
-
         # origin group without fp32
         pgroup["params"] = origin_params
+        new_groups.append(fp32_group)
 
-    for _, v in new_groups.items():
-        for _, v1 in v.items():
-            param_groups.append(v1)
+    for g in new_groups:
+        param_groups.append(g)
 
     return tuple(param_groups)