fix format (#607)

colossalai/communication/p2p.py

@@ -12,7 +12,6 @@ from functools import reduce
 import operator
 from .utils import split_tensor_into_1d_equal_chunks, gather_split_1d_tensor
 
-
 TensorShape = Union[torch.Size, List[int], Tuple[int]]
 
 
@@ -88,13 +87,11 @@ def _communicate(tensor_send_next=None,
 
     if tensor_send_prev is not None or recv_prev:
         if prev_rank is None:
-            prev_rank = gpc.get_prev_global_rank(
-                ParallelMode.PIPELINE)
+            prev_rank = gpc.get_prev_global_rank(ParallelMode.PIPELINE)
 
     if tensor_send_next is not None or recv_next:
         if next_rank is None:
-            next_rank = gpc.get_next_global_rank(
-                ParallelMode.PIPELINE)
+            next_rank = gpc.get_next_global_rank(ParallelMode.PIPELINE)
 
     if tensor_send_prev is not None:
         send_prev_split = _get_tensor_shape(tensor_send_prev.shape, scatter_gather_tensors)[1]
@@ -183,9 +180,7 @@ def send_forward(output_tensor, next_rank=None, scatter_gather_tensors=False):
         next_rank (int, optional): The rank of the recipient of the tensor.
     """
     if not gpc.is_pipeline_last_stage():
-        _communicate(tensor_send_next=output_tensor,
-                     next_rank=next_rank,
-                     scatter_gather_tensors=scatter_gather_tensors)
+        _communicate(tensor_send_next=output_tensor, next_rank=next_rank, scatter_gather_tensors=scatter_gather_tensors)
 
 
 def send_backward(input_tensor_grad, prev_rank=None, scatter_gather_tensors=False):
@@ -338,8 +333,7 @@ def send_forward_backward_recv_forward_backward(output_tensor,
     Returns:
         Tuple(Tensor, Tensor): (the input tensor, the input gradient tensor)
     """
-    input_tensor, output_tensor_grad = _communicate(
-        tensor_send_next=output_tensor,
+    input_tensor, output_tensor_grad = _communicate(tensor_send_next=output_tensor,
                                                     tensor_send_prev=input_tensor_grad,
                                                     recv_prev=recv_prev,
                                                     recv_next=recv_next,