zhreshold commented on a change in pull request #9614: MobileNetV2 URL: https://github.com/apache/incubator-mxnet/pull/9614#discussion_r168075699
########## 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: @dwSun from 28^2x32 to 28^2x64, it should be stride 1. I am observing 14^2x64 feature map, which corresponds to stride 2. The input sizes and strides in this table is conflicting, but I am not sure which one is correct unless we compute the Mult-add and compare with the claims in paper. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services