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

RNN AM

• Initial test on WSJ , leads to out-memory.
• Using AURORA 4 short-sentence with a smaller number of targets.

Noise training

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

Drop out & Rectification & convolutive network

• Drop out

• dataset:wsj, testset:eval93

       std |  dropout0.2 | dropout0.4 | dropout0.6 | dropout0.8
    ------------------------------------------------------------- 
      4.5  |     4.54    |    4.5     |   4.25     |    4.5      

• Test on noisy AURORA 4 dataset
• Continue the droptout on normal trained XEnt NNET , eg wsj.
• Draft the dropout-DNN weight distribution.

• Rectification

• Still NAN error, need to debug.

• MaxOut

• Convolutive network

• Test more configurations
• Yiye will work on CNN

Denoising & Farfield ASR

• ICASSP paper submitted.

VAD

• Add more silence tag "#" in pure-silence utterance text(train).

• xEntropy model be training

• Sum all sil-pdf as the silence posterior probability.

Speech rate training

• 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

• Use Chinese NN as initial NN, change the last layer

• Various the used Chinese trained DNN layer numbers.

Scoring

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

Confidence

• Reproduce the experiments on fisher dataset.
• Use the fisher DNN model to decode all-wsj dataset

Speaker ID

• Preparing GMM-based server.

Emotion detection

• 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