[NFC] polish colossalai/auto_parallel/tensor_shard/utils/factory.py code style (#2349)

colossalai/auto_parallel/tensor_shard/utils/factory.py

@@ -4,10 +4,11 @@ from functools import reduce
 from typing import Dict, List, Optional, Union
 
 import torch
+from torch.fx.node import Node
+
 from colossalai.device.device_mesh import DeviceMesh
 from colossalai.tensor.shape_consistency import ShapeConsistencyManager
 from colossalai.tensor.sharding_spec import ShardingSpec
-from torch.fx.node import Node
 
 from ..constants import INFINITY_COST
 
@@ -18,7 +19,7 @@ def generate_sharding_spec(input_: Union[Node, torch.Tensor], device_mesh: Devic
                            dim_partition_dict: Dict[int, List[int]]) -> ShardingSpec:
     """
     Generate the sharding spec of the tensor based on the given dim_partition_dict.
-    
+
 
     Args:
         input_ (Union[Node, torch.Tensor]): the input can be a Node object or a PyTorch tensor. If a node is used, it will look for its meta data associated with this node.
@@ -59,7 +60,7 @@ def generate_resharding_costs(nodes: List[Node],
         nodes (List[Node]): a list of nodes
         sharding_spec_for_input(ShardingSpec): a list of ShardingSpec for the nodes.
         count_backward (Optional[bool]): whether to include the cost of resharding in the backward pass, default is True. False can be used for inference.
-        dtype (Optional[torch.dtype]): the data type for cost calculation, default is None. 
+        dtype (Optional[torch.dtype]): the data type for cost calculation, default is None.
     '''
     # The resharding_cost of weight is counted due to sharing weight cases.
     resharding_costs = {}