hotfix colotensor _scan_for_pg_from_args (#1276)

colossalai/tensor/colo_tensor.py

@@ -40,7 +40,7 @@ def _scan_for_pg_from_args(args, kwargs) -> ProcessGroup:
             pg = _scan_for_pg_from_args(elem, {})
             if pg is not None:
                 return pg
-    for k, v in kwargs:
+    for k, v in kwargs.items():
         if isinstance(v, ColoTensor):
             pg = v.get_process_group()
             return pg
@@ -52,7 +52,7 @@ class ColoTensor(torch.Tensor):
     Args:
         data (torch.Tensor): a torch tensor used as the payload the colotensor.
         spec (ColoTensorSpec, optional): the tensor spec of initialization. Defaults to ColoTensorSpec(ReplicaSpec()).
-    
+
     The signature of the function has to be consistent with the __new__ except for the 1st arg.
     The class should be initialized with a torch tensor in the following ways.
     1. directly init.