Hybrid Neural Network with Cross- and Self-Module Attention Pooling for Text-Independent Speaker Verification

Extraction of a speaker embedding vector plays an important role in deep learning-based speaker verification. In this contribution, to extract speaker discriminant utterance level embeddings, we propose a hybrid neural network that employs both cross- and self-module attention pooling mechanisms. More specifically, the proposed system incorporates a 2D-Convolution Neural Network (CNN)-based feature extraction module in cascade with a frame-level network, which is composed of a fully Time Delay Neural Network (TDNN) network and a TDNN-Long Short Term Memory (TDNN-LSTM) hybrid network in a parallel manner. The proposed system also employs a multi-level cross- and self-module attention pooling for aggregating the speaker information within an utterance-level context by capturing the complementarity between two parallelly connected modules. In order to evaluate the proposed system, we conduct a set of experiments on the Voxceleb corpus, and the proposed hybrid network is able to outperform the conventional approaches trained on the same dataset.