Lightweight Compression of Intermediate Neural Network Features for Collaborative Intelligence

• URL: http://arxiv.org/abs/2105.07102v1
• Date: Sat, 15 May 2021 00:10:12 GMT
• Title: Lightweight Compression of Intermediate Neural Network Features for Collaborative Intelligence
• Authors: Robert A. Cohen, Hyomin Choi, Ivan V. Baji\'c
• Abstract summary: In collaborative intelligence applications, part of a deep neural network (DNN) is deployed on a lightweight device such as a mobile phone or edge device. This paper presents a novel lightweight compression technique designed specifically to quantize and compress the features output by the intermediate layer of a split DNN.
• Score: 32.03465747357384
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In collaborative intelligence applications, part of a deep neural network (DNN) is deployed on a lightweight device such as a mobile phone or edge device, and the remaining portion of the DNN is processed where more computing resources are available, such as in the cloud. This paper presents a novel lightweight compression technique designed specifically to quantize and compress the features output by the intermediate layer of a split DNN, without requiring any retraining of the network weights. Mathematical models for estimating the clipping and quantization error of ReLU and leaky-ReLU activations at this intermediate layer are developed and used to compute optimal clipping ranges for coarse quantization. We also present a modified entropy-constrained design algorithm for quantizing clipped activations. When applied to popular object-detection and classification DNNs, we were able to compress the 32-bit floating point intermediate activations down to 0.6 to 0.8 bits, while keeping the loss in accuracy to less than 1%. When compared to HEVC, we found that the lightweight codec consistently provided better inference accuracy, by up to 1.3%. The performance and simplicity of this lightweight compression technique makes it an attractive option for coding an intermediate layer of a split neural network for edge/cloud applications.

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