Train your classifier first: Cascade Neural Networks Training from upper layers to lower layers
arXiv:2102.04697
Abstract
Although the lower layers of a deep neural network learn features which are transferable across datasets, these layers are not transferable within the same dataset. That is, in general, freezing the trained feature extractor (the lower layers) and retraining the classifier (the upper layers) on the same dataset leads to worse performance. In this paper, for the first time, we show that the frozen classifier is transferable within the same dataset. We develop a novel top-down training method which can be viewed as an algorithm for searching for high-quality classifiers. We tested this method on automatic speech recognition (ASR) tasks and language modelling tasks. The proposed method consistently improves recurrent neural network ASR models on Wall Street Journal, self-attention ASR models on Switchboard, and AWD-LSTM language models on WikiText-2.
Accepted by ICASSP 2021
References in corpus (5)
- ADADELTA: An Adaptive Learning Rate Method
- How transferable are features in deep neural networks?
- First-Pass Large Vocabulary Continuous Speech Recognition using Bi-Directional Recurrent DNNs
- Training Neural Networks with Local Error Signals
- Forward Thinking: Building and Training Neural Networks One Layer at a Time