diff --git a/mmdet/ops/crop/crop_split.py b/mmdet/ops/crop/crop_split.py
index 448a221..33f9749 100755
--- a/mmdet/ops/crop/crop_split.py
+++ b/mmdet/ops/crop/crop_split.py
@@ -2,7 +2,6 @@
 import torch.nn as nn
 from torch.autograd import Function
 from torch.autograd.function import once_differentiable
-from torch.nn.modules.utils import _pair
 
 from . import crop_split_cuda
 
@@ -17,7 +16,7 @@ def forward(ctx, data, rois, c):
         ctx.height = height
         ctx.width = width
         ctx.n = n
-        ctx.rois = _pair(rois)
+        ctx.rois = rois
         # print(height*width*n)
         output = data.new_zeros(height, width, n)
         crop_split_cuda.crop_split_cuda_forward(data, rois, output, height, width, c, n)
@@ -46,4 +45,4 @@ def __init__(self, c=2):
         self.c = c
 
     def forward(self, data, rois):
-        return crop_split(data, rois, self.c)
\ No newline at end of file
+        return crop_split(data, rois, self.c)