zhreshold commented on a change in pull request #9614: MobileNetV2
URL: https://github.com/apache/incubator-mxnet/pull/9614#discussion_r168042820
 
 

 ##########
 File path: python/mxnet/gluon/model_zoo/vision/mobilenet.py
 ##########
 @@ -74,13 +123,69 @@ def hybrid_forward(self, F, x):
         x = self.output(x)
         return x
 
+
+class MobileNetV2(nn.HybridBlock):
+    r"""MobileNetV2 model from the
+    `"Inverted Residuals and Linear Bottlenecks:
+      Mobile Networks for Classification, Detection and Segmentation"
+    <https://arxiv.org/abs/1801.04381>`_ paper.
+
+    Parameters
+    ----------
+    multiplier : float, default 1.0
+        The width multiplier for controling the model size. The actual number 
of channels
+        is equal to the original channel size multiplied by this multiplier.
+    classes : int, default 1000
+        Number of classes for the output layer.
+    """
+
+    def __init__(self, multiplier=1.0, classes=1000, **kwargs):
+        super(MobileNetV2, self).__init__(**kwargs)
+        with self.name_scope():
+            self.features = nn.HybridSequential(prefix='features_')
+            with self.features.name_scope():
+                _add_conv(self.features, int(32 * multiplier), kernel=3, 
stride=2, pad=1)
+
+                in_channels_group = [int(x * multiplier) for x in [32] + [16] 
+ [24] * 2
+                                     + [32] * 3 + [64] * 4 + [96] * 3 + [160] 
* 3]
+                channels_group = [int(x * multiplier) for x in [16] + [24] * 2 
+ [32] * 3
+                                  + [64] * 4 + [96] * 3 + [160] * 3 + [320]]
+                ts = [1] + [6] * 16
+                strides = [1, 2] * 2 + [1] * 2 + [2] + [1] * 3 + [1] * 3 + [2] 
+ [1] * 3
 
 Review comment:
   I think there's a mistake in paper:
   <img width="532" alt="screen shot 2018-02-13 at 5 54 45 pm" 
src="https://user-images.githubusercontent.com/3307514/36180798-82978a1a-10e7-11e8-85e9-b39b552c7908.png";>
   Therefore the strides here should be:
   ```
   strides = [1, 2] * 2 + [1] * 3 + [2] + [1] * 2 + [1] * 3 + [2] + [1] * 3
   ```
   More inputs and eyes are welcome if you find this not correct @dwSun @szha 

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