2014-10-13

Speech Processing

AM development

Sparse DNN

• Performance improvement found when pruned slightly
• Experiments show that
• Suggest to use TIMIT / AURORA 4 for training

Noise training

• First draft of the noisy training journal paper
• Check abnormal behavior with large sigma (Yinshi, Liuchao)

Drop out & Rectification & convolutive network

• Drop out

• No performance improvement found yet.
• [1]

• Rectification

• Dropout NA problem was caused by large magnitude of weights

• Convolutive network

1. Test more configurations

• Zhiyong will work on CNN

• Recurrent neural network

• investigate CURRENNT for AM

Denoising & Farfield ASR

• Lasso-based de-reverberation is done with the REVERBERATION toolkit

• Start to compose the experiment section for the SL paper.

VAD

• problems found at the beginning part of speech (0-0.02s?)
• Noise model training done. Under testing.
• Need to investigate the performance reduction in babble noise. Call Jia.

Speech rate training

• Some interesting results with the simple speech rate change algorithm was obtained on the WSJ db

[2]

• Seems ROS model is superior to the normal one with faster speech
• Need to check distribution of ROS on WSJ
• Suggest to extract speech data of different ROS, construct a new test set
• Suggest to use Tencent training data
• Suggest to remove silence when compute ROS

low resource language AM training

• Results on CVSS[3]
• Use Chinese NN as initial NN, change the last layer

Scoring

• global scoring done.
• Pitch & rhythm done, need testing
• Harmonics hold

Confidence

• experiments done, need more data
• Basic confidence by using lattice-based posterior + DNN posterior + ROS done
• 23% detection error achieved by balanced model

Speaker ID

• Add VAD to system
• GMM-based test program delivered
• GMM registration program done

Emotion detection

• Zhang Weiwei is learning the code
• Sinovoice is implementing the server

Text Processing

LM development

Domain specific LM

h2. ngram generation is on going h2. look the memory and baidu_hi done

h2. NUM tag LM:

• maxi work is released.
• yuanbin continue the tag lm work.
• add the ner to tag lm .
• Boost specific words like wifi if TAG model does not work for a particular word.

Word2Vector

W2V based doc classification

• Initial results variable Bayesian GMM obtained. Performance is not as good as the conventional GMM.
• Non-linear inter-language transform: English-Spanish-Czch: wv model training done, transform model on investigation

• SSA-based local linear mapping still on running.
• k-means classes change to 2.

• Knowledge vector started

• format the data

• Character to word conversion

• prepare the task: word similarity
• prepare the dict.

• Google word vector train

• improve the sampling method

RNN LM

• rnn
• lstm+rnn

install the tool and prepare the data of wsj

prepare the baseline.

Translation

• v3.0 demo released

• still slow
• re-segment the word using new dictionary.
• check new data.

QA

• search method:

• add the vsm and BM25 to improve the search. and the strategy of selecting the answer
• segment the word using minimum granularity for lucene index and bag-of-words method.

• new inter will install SEMPRE