# Wangd-wiki-article-2020-nb

From cslt Wiki

## 2017

- Back to 2017, we set our goal of deep speech factorizatoin. The first paper is published on ICASSP 2018

- Lantian Li, Dong Wang, Yixiang Chen, Ying Shi, Zhiyuan Tang, "DEEP FACTORIZATION FOR SPEECH SIGNAL", ICASSP 2018. [1]

- We noticed the problem of soft-max based training, due to the discardxing of the output layers

- Lantian Li, Zhiyuan Tang, Dong Wang, "FULL-INFO TRAINING FOR DEEP SPEAKER FEATURE LEARNING", ICASSP 2018. [2]

## 2018

- 2018/12/26, propose the idea of deep statistical speaker representation. That was based on VAE [3]

## 2019

- We noticed the impact of irregulation of deep speaker vectors, and tried to present normalization approaches

- Yang Zhang and Lantian Li and Dong Wang, VAE-based regularization for deep speaker embedding, Interspeech 2019. [4]

- 2019/04/20, "Normalization in speaker embedding", Speaker recognition workshop, Kunshan, Shanghai, [5]
- 2019/07/17, Deep Feature Learning and Normalization for Speaker Recognition, report in India summr school [6]
- 2019/08/14, present the first proposal that uses flow to model deep speaker featrues. (Report in Huawei group discussion)
- 2019/10/27, present the initial idea of using flow to perform factorization, CSLT weekly meeting [7]

## 2020

- 2019/11/12, Yunqi start to work on DNF, using the subspace of the dimension to discriminte speakers [cvss 714]
- 2019/12/20, I start to work on NF with constraint training. More understanding acheived for LDA. [cvss 741]
- 2020/1/23, I noticed a bug in the DNF code, where the residual space was infact trained, so it is not a true dim-split DNF we hoped. [cvss 741]
- 2020/1/27, I conjectured the normalization role of DNF, and informed YQ to perform a full-space experiment. The results are good. [8] [9]
- 2020/1/28, I confirmed the normalization role of LDA for x-vectors. This forms the basic argument for the deep norm paper. [cvss 741]
- 2020/2/10, Dong Wang, Deep Generative Models for Discriminative Tasks, CSLT weekly meeting. Present DNF
- 2020/2/18, Deep norm paper submitted to IEEE Transactions.
- 2020/2/24, I start working on optimal scoring for SRE, and establish the NL theory. The paper was submitted on 3.17 to APSIPA transaction.
- 2020/3/21, I coined the NDA model, and completed the verification in 3 hours. This model can be used for scoring.
- 2020/3/25, I designed the VAE-NF model, using NF to perform the generation net in VAE. It can generate more informative latent codes but the theory is not completed.
- 2020/3/27, I extend the NDA to neural linear Gaussian model.
- 2020/3/28, I extend the NDA to neural Bayesian model.
- 2020/4/01, I started to work on NPCA. A simple L2 constraind algorithm was obtained, but this seems cannot find flexible manifold. Stop the work on 04/04.
- 2020/4/04, Lantian demonstrated the NDA model with x-vector
- 2020/4/06, I proposed the VAE-like NDA
- 2020/4/08, Yunqi demonstrated VAE-like NDA with x-vector
- 2020/4/10, I found the convergnece of the NDA model in simulation test (convergence of SB)
- 2020/4/12, I proposed the Bayesian denoising approach
- 2020/4/18, Lantian demonstrated the convergence of the NDA model with x vector
- 2020/4/20, Zhiyuan demonstrated the capability of Bayesian denoising with white noise
- 2020/4/21, I proposed to use Bayesian denoising with noise NF, and the architecture for speech separation based on the Bayesian inference.
- 2020/4/24, Lantian demonstrated PLDA and linear NDA are equivalent using x-vector, and found the importance of length norm.
- 2020/5/05, Dong Wang designed the discriminative training method for DNF, using small set of x-vector to test.
- 2020/5/18, Yunqi demonstrated DT training for DNF, with the entropy contraint.
- 2020/5/23, Dong Wang proposed multiple flow based denoising.