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MobileNetV2: The Next Generation of On-Device Computer Vision Networks
Tuesday, April 3, 2018
Posted by Mark Sandler and Andrew Howard, Google Research
Last year we introduced
MobileNetV1
, a family of general purpose computer vision neural networks designed with mobile devices in mind to support classification, detection and more. The ability to run deep networks on personal mobile devices improves user experience, offering anytime, anywhere access, with additional benefits for security, privacy, and energy consumption. As new applications emerge allowing users to interact with the real world in real time, so does the need for ever more efficient neural networks.
Today, we are pleased to announce the availability of
MobileNetV2
to power the next generation of mobile vision applications. MobileNetV2 is a significant improvement over MobileNetV1 and pushes the state of the art for mobile visual recognition including classification, object detection and semantic segmentation. MobileNetV2 is released as part of
TensorFlow-Slim Image Classification Library
, or you can start exploring MobileNetV2 right away in
Colaboratory
. Alternately, you can
download
the notebook and explore it locally using
Jupyter
. MobileNetV2 is also available as
modules
on TF-Hub, and pretrained checkpoints can be found
on github
.
MobileNetV2 builds upon the ideas from MobileNetV1 [1], using depthwise separable convolution as efficient building blocks. However, V2 introduces two new features to the architecture: 1) linear bottlenecks between the layers, and 2) shortcut connections between the bottlenecks
1
. The basic structure is shown below.
Overview of MobileNetV2 Architecture. Blue blocks represent composite convolutional building blocks as shown above.
The intuition is that the bottlenecks encode the model’s intermediate inputs and outputs while the inner layer encapsulates the model’s ability to transform from lower-level concepts such as pixels to higher level descriptors such as image categories. Finally, as with traditional residual connections, shortcuts enable faster training and better accuracy. You can learn more about the technical details in our paper, “
MobileNet V2: Inverted Residuals and Linear Bottlenecks
”.
How does it compare to the first generation of MobileNets?
Overall, the MobileNetV2 models are faster for the same accuracy across the entire latency spectrum. In particular, the new models use 2x fewer operations, need 30% fewer parameters and are about 30-40% faster on a Google Pixel phone than MobileNetV1 models, all while achieving higher accuracy.
MobileNetV2 improves speed (reduced latency) and increased ImageNet Top 1 accuracy
MobileNetV2 is a very effective feature extractor for object detection and segmentation. For example, for detection when paired with the newly introduced SSDLite [2] the new model is about 35% faster with the same accuracy than MobileNetV1. We have open sourced the model under the
Tensorflow Object Detection API
[4].
Model
Params
Multiply-Adds
mAP
Mobile CPU
MobileNetV1 + SSDLite
5.1M
1.3B
22.2%
270ms
MobileNetV2 + SSDLite
4.3M
0.8B
22.1%
200ms
To enable on-device semantic segmentation, we employ MobileNetV2 as a feature extractor in a reduced form of DeepLabv3 [3], that was
announced recently
. On the semantic segmentation benchmark,
PASCAL VOC 2012
, our resulting model attains a similar performance as employing MobileNetV1 as feature extractor, but requires 5.3 times fewer parameters and 5.2 times fewer operations in terms of Multiply-Adds.
Model
Params
Multiply-Adds
mIOU
MobileNetV1 + DeepLabV3
11.15M
14.25B
75.29%
MobileNetV2 + DeepLabV3
2.11M
2.75B
75.32%
As we have seen MobileNetV2 provides a very efficient mobile-oriented model that can be used as a base for many visual recognition tasks. We hope by sharing it with the broader academic and open-source community we can help to advance research and application development.
Acknowledgements:
We would like to acknowledge our core contributors Menglong Zhu, Andrey Zhmoginov and Liang-Chieh Chen. We also give special thanks to Bo Chen, Dmitry Kalenichenko, Skirmantas Kligys, Mathew Tang, Weijun Wang, Benoit Jacob, George Papandreou, Zhichao Lu, Vivek Rathod, Jonathan Huang, Yukun Zhu, and Hartwig Adam.
References
MobileNets: Efficient Convolutional Neural Networks for Mobile Vision Applications
,
Howard AG, Zhu M, Chen B, Kalenichenko D, Wang W, Weyand T, Andreetto M, Adam H, arXiv:1704.04861, 2017.
MobileNetV2: Inverted Residuals and Linear Bottlenecks
,
Sandler M, Howard A, Zhu M, Zhmoginov A, Chen LC. arXiv preprint. arXiv:1801.04381, 2018.
Rethinking Atrous Convolution for Semantic Image Segmentation
,
Chen LC, Papandreou G, Schroff F, Adam H. arXiv:1706.05587, 2017.
Speed/accuracy trade-offs for modern convolutional object detectors
,
Huang J, Rathod V, Sun C, Zhu M, Korattikara A, Fathi A, Fischer I, Wojna Z, Song Y, Guadarrama S, Murphy K, CVPR 2017.
Deep Residual Learning for Image Recognition
,
He, Kaiming, Xiangyu Zhang, Shaoqing Ren, and Jian Sun. arXiv:1512.03385,2015
1
The shortcut (also known as skip) connections, popularized by ResNets[5] are commonly used to connect the non-bottleneck layers. MobilenNetV2 inverts this notion and connects the bottlenecks directly.
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