Liu Shouda coder

idlak特征解析

2016-08-10
speech
 

剖析idlak特征

先source path.sh 再运行以下代码

对齐特征

ali是每一帧的特征信息。

cat ali | awk '{print $1, "["; $1=""; na = split($0, a, ";"); for (i = 1; i < na; i++) print a[i]; print "]"}' | copy-feats ark:- ark,scp:in_feats_full.ark,in_feats_full.scp

加一个,t可以转化为可读模式..

cat ali | awk '{print $1, "["; $1=""; na = split($0, a, ";"); for (i = 1; i < na; i++) print a[i]; print "]"}' | copy-feats ark:- ark,t,scp:in_feats_full.ark,in_feats_full.scp

提取时长特征

讲文本特征中，在音素，状态内的相对位置信息删除（这些对于估计时长没有作用。在估计时长的时候，只需要每个音素，每个状态的总长度）

copy-feats ark:in_feats_full.ark ark,t:- \
    | awk -v nstate=5 'BEGIN{oldkey = 0; oldstate = -1; for (s = 0; s < nstate; s++) asd[s] = 0}
function print_phone(vkey, vasd, vpd) {
      for (s = 0; s < nstate; s++) {
         print vkey, s, vasd[s], vpd;
         vasd[s] = 0;
      }
}
(NF == 2){print}
(NF > 2){
   n = NF;
   if ($NF == "]") n = NF - 1;
   state = $(n-4); sd = $(n-3); pd = $(n-1);
   for (i = n-4; i <= NF; i++) $i = "";
   len = length($0);
   if (n != NF) len = len -1;
   key = substr($0, 1, len - 5);
   if ((key != oldkey) && (oldkey != 0)) {
      print_phone(oldkey, asd, opd);
      oldstate = -1;
   }
   if (state != oldstate) {
      asd[state] += sd;
   }
   opd = pd;
   oldkey = key;
   oldstate = state;
   if (NF != n) {
      print_phone(key, asd, opd);
      oldstate = -1;
      oldkey = 0;
      print "]";
   }
}' > tmp_durfeats_full.ark

特征维度获取：

feat-to-dim ark:tmp_durfeats_full.ark -
输出： 377

dur训练的输入，输出（最后两维作为输出，分别对应于每个音素状态的帧数，音素的总帧数）：

select-feats 0-374 ark:tmp_durfeats_full.ark ark,t,scp:in_durfeats_full.ark,in_durfeats_full.scp
select-feats 375-376 ark:tmp_durfeats_full.ark ark,t,scp:out_durfeats_full.ark,out_durfeats_full.scp

dnn 训练

将in_durfeats_full.scp， out_durfeats_full.scp 作为输入输出训练时长模型 将in_feats_full, feats.scp(声学cmp feature) 作为输入输出训练声学模型

数据观察

head -n 42 in_feats_full.ark

该数据中，每行倒5为状态编号，倒4是当前状态连续帧数目，倒2为该音素帧总数。倒1表示总长度的十分之几。计算方法：当前音素帧偏移/音素帧总数 x 10（这个hmm是静音模型，所以不是从左到右线性转移，状态会有跳跃。正常的音素模型状态不会有跳跃）. 倒３是当前状态的帧偏移　/ 当前状态帧总数　x 5。

总结最后５位表示：　状态号　状态帧总数　状态帧偏移　音素帧总数　音素帧偏移

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in_durfeats_full.ark

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out_durfeats_full

1 41
8 41
21 41
10 41
1 41

如果预测的时候总帧长度不一致怎么办

依次列出每个状态的帧数。对于有些非顺序的情况（sil），则使用使用累积状态数。 以上对应的实际帧对齐是：

0 1
3 3
2 12
3 7
2 9
1 8
4 1

对于不包含某些状态的对齐信息，如下：

2 8
5 8
0 8
0 8
1 8

之所以需要第一个标识每个状态的长度，是因为hmm是状态级别的绑定。每个状态都会有一个长度，再由该状态pdf计算出声学参数

cex_output_dump

slt_arctic_b0506 p eh l p t ah 3 0 1 1 0 MD NN TO 3 4 2 1 1 1 12 LL
slt_arctic_b0506 t l p t ah t 0 1 1 0 1 NN TO NN 4 2 3 1 1 1 12 LL
slt_arctic_b0506 ah p t ah t ay 1 0 1 0 1 NN TO NN 4 2 3 1 1 1 12 LL
slt_arctic_b0506 t t ah t ay d 0 2 0 1 1 TO NN PP 2 3 2 1 1 1 12 LL
slt_arctic_b0506 ay ah t ay d m 1 1 0 1 1 TO NN PP 2 3 2 1 1 1 12 LL

特征的前面部分分别是当前音素，5音素模型。。这几个的one hot表示维度就已经很多了。总的维度379

可以参考 name [value] 这个格式写入纯文本构造ark文件，再用copy-feature构造scp，ark文件。

重点：

  1. 数据的准备。确定必须要的数据，lang等参考thchs30..可以先离线构造，或者jimmy构造一个cslt一模一样的allophone.xml
  2. 如何对齐。

hmm非线性？如何定义hmm拓扑结构。

在data/lang/topo中定义拓扑结构。还是相当直观的。在kaldi中，对于静音以及oov模型采用非线性结构，其余正常的音素采用从左到右边线性结构。

<Topology>
<TopologyEntry>
<ForPhones> #正常字符采用线性结构
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
</ForPhones>
<State> 0 <PdfClass> 0 <Transition> 0 0.75 <Transition> 1 0.25 </State>
<State> 1 <PdfClass> 1 <Transition> 1 0.75 <Transition> 2 0.25 </State>
<State> 2 <PdfClass> 2 <Transition> 2 0.75 <Transition> 3 0.25 </State>
<State> 3 <PdfClass> 3 <Transition> 3 0.75 <Transition> 4 0.25 </State>
<State> 4 <PdfClass> 4 <Transition> 4 0.75 <Transition> 5 0.25 </State>
<State> 5 </State>
</TopologyEntry>
<TopologyEntry>
<ForPhones> #静音或者oov。结构非线性
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
</ForPhones>
<State> 0 <PdfClass> 0 <Transition> 0 0.25 <Transition> 1 0.25 <Transition> 2 0.25 <Transition> 3 0.25 </State>
<State> 1 <PdfClass> 1 <Transition> 1 0.25 <Transition> 2 0.25 <Transition> 3 0.25 <Transition> 4 0.25 </State>
<State> 2 <PdfClass> 2 <Transition> 1 0.25 <Transition> 2 0.25 <Transition> 3 0.25 <Transition> 4 0.25 </State>
<State> 3 <PdfClass> 3 <Transition> 1 0.25 <Transition> 2 0.25 <Transition> 3 0.25 <Transition> 4 0.25 </State>
<State> 4 <PdfClass> 4 <Transition> 4 0.75 <Transition> 5 0.25 </State>
<State> 5 </State>
</TopologyEntry>
</Topology>

kaldi的对齐效果如何可视化，效果如何评估。

  1. 准备文本特征矩阵。one hot表示总维度问题。在cppmary上开发。需要读取kaldi的对齐信息，然后在cppmary上构造对齐矩阵。

  2. 整体一起训练。。训练整体效果。并最终迁移到最新kaldi版本上。

文本特征准备分析

1.

python $KALDI_ROOT/idlak-voice-build/utils/idlak_make_lang.py --mode 2 data/$step/text_afull.xml data/$step/cex.ark > data/$step/cex_output_dump

cex.ark的内容是每个音素的文本特征。

2.

make-fullctx-ali-dnn --max-sil-phone=15 $ali/final.mdl ark:"gunzip -c $ali/ali.*.gz|" ark,t:data/$step/cex.ark ark,t:data/$step/ali

将音素特征按照对齐信息进行展开。

每个文件的特征占用一行。 filename features。 特征之间用分号做间隔。

  1. 转化为kaldi的ark，scp格式
cat data/$step/ali \
| awk '{print $1, "["; $1=""; na = split($0, a, ";"); for (i = 1; i < na; i++) print a[i]; print "]"}' \
| copy-feats ark:- ark,scp:$featdir/in_feats_$step.ark,$featdir/in_feats_$step.scp

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