diff --git a/mmseg/models/backbones/fast_scnn.py b/mmseg/models/backbones/fast_scnn.py
index 9a1284d5f..031fdc779 100644
--- a/mmseg/models/backbones/fast_scnn.py
+++ b/mmseg/models/backbones/fast_scnn.py
@@ -3,9 +3,8 @@ import torch.nn as nn
 from mmcv.cnn import ConvModule, constant_init, kaiming_init
 from torch.nn.modules.batchnorm import _BatchNorm
 
-from mmseg.models.backbones.mobile_net_v2 import InvertedResidual
 from mmseg.models.decode_heads.psp_head import PPM
-from mmseg.ops import DepthwiseSeparableConvModule, resize
+from mmseg.ops import DepthwiseSeparableConvModule, InvertedResidual, resize
 from ..builder import BACKBONES
 
 
diff --git a/mmseg/ops/__init__.py b/mmseg/ops/__init__.py
index 54b0d0b79..29a148b45 100644
--- a/mmseg/ops/__init__.py
+++ b/mmseg/ops/__init__.py
@@ -1,5 +1,8 @@
 from .encoding import Encoding
+from .inverted_residual_module import InvertedResidual
 from .separable_conv_module import DepthwiseSeparableConvModule
 from .wrappers import resize
 
-__all__ = ['resize', 'DepthwiseSeparableConvModule', 'Encoding']
+__all__ = [
+    'resize', 'DepthwiseSeparableConvModule', 'InvertedResidual', 'Encoding'
+]
diff --git a/mmseg/models/backbones/mobile_net_v2.py b/mmseg/ops/inverted_residual_module.py
similarity index 80%
rename from mmseg/models/backbones/mobile_net_v2.py
rename to mmseg/ops/inverted_residual_module.py
index 3160ed9b1..1d7ea36bf 100644
--- a/mmseg/models/backbones/mobile_net_v2.py
+++ b/mmseg/ops/inverted_residual_module.py
@@ -3,6 +3,17 @@ from torch import nn
 
 
 class InvertedResidual(nn.Module):
+    """Inverted Residual Module
+    Args:
+        inp (int): input channels.
+        oup (int): output channels.
+        stride (int): downsampling factor.
+        expand_ratio (int): 1 or 2.
+        dilation (int): Dilated conv. Default: 1
+        conv_cfg (dict|None): Config of conv layers.
+        norm_cfg (dict|None): Config of norm layers.
+        act_cfg (dict): Config of activation layers.
+    """
 
     def __init__(self,
                  inp,