fixed typo in ShardParam (#294)

colossalai/zero/shard_param/shard_param.py

 from enum import Enum
-from optparse import Option
 import torch
 from colossalai.zero.sharded_model._zero3_utils import get_shard
 from colossalai.context.parallel_mode import ParallelMode
 from colossalai.core import global_context as gpc
 import torch.distributed as dist
 
+
 class TensorType(Enum):
     GRAD = 1
     DATA = 2
 
+
 class ShardParam(object):
     r"""
     A wrapper to torch.nn.Parameter. Shard a param
     on different processes.
     """
-    def __init__(self,
-            param: torch.nn.Parameter,
-            tensor_type: TensorType = TensorType.DATA,
-            process_group = None,
-        ) -> None:
+
+    def __init__(
+        self,
+        param: torch.nn.Parameter,
+        tensor_type: TensorType = TensorType.DATA,
+        process_group=None,
+    ) -> None:
         self.process_group = process_group or gpc.get_group(ParallelMode.DATA)
         self.world_size = dist.get_world_size(self.process_group)
         self.local_rank = dist.get_rank(self.process_group)
@@ -27,27 +30,27 @@ class ShardParam(object):
         self._payload_numel = None
         self._origin_shape = param.shape
         self._origin_numel = param.numel()
-        self.is_shared = False
-    
-    def payload(self, target_device : torch.device):
+        self.is_sharded = False
+
+    def payload(self, target_device: torch.device):
         return self._param_payload.to(target_device)
 
     def shard(self):
         r"""
         Distributed the payload of param to all processes.
         """
-        if self.is_shared:
+        if self.is_sharded:
             return
         self._param_payload, _ = get_shard(self._param_payload, self.local_rank, self.world_size)
-        self.is_shared = True
-    
+        self.is_sharded = True
+
     def gather(self):
         r"""
         Collect the payload of param from different processes to process of local rank.
         """
-        if not self.is_shared:
+        if not self.is_sharded:
             return
-        
+
         buffer_list = []
         payload_numel = self._param_payload.numel()
         for i in range(self.world_size):
@@ -55,9 +58,10 @@ class ShardParam(object):
                 buffer_list.append(self._param_payload.cuda())
             else:
                 buffer_list.append(torch.zeros(payload_numel).cuda())
-        
-        torch.distributed.all_gather(buffer_list, buffer_list[self.local_rank], group=self.process_group, async_op=False)
-        print(buffer_list)
-        self._param_payload = torch.narrow(torch.cat(buffer_list), 0, 0, self._origin_numel).view(self._origin_shape)
-        self.is_shared = False
 
+        torch.distributed.all_gather(buffer_list,
+                                     buffer_list[self.local_rank],
+                                     group=self.process_group,
+                                     async_op=False)
+        self._param_payload = torch.narrow(torch.cat(buffer_list), 0, 0, self._origin_numel).view(self._origin_shape)
+        self.is_sharded = False