Semi-supervised training on Fisher English

egs/babel_multilang/s5/local/nnet3/run_tdnn_multilingual.sh

@@ -247,7 +247,6 @@ if [ $stage -le 10 ] && [ ! -z $megs_dir ]; then
   common_egs_dir="${multi_egs_dirs[@]} $megs_dir"
   steps/nnet3/multilingual/combine_egs.sh $egs_opts \
     --cmd "$decode_cmd" \
-    --samples-per-iter 400000 \
     $num_langs ${common_egs_dir[@]} || exit 1;
 fi
 

egs/fisher_english/s5/local/fisher_create_test_lang.sh

@@ -1,23 +1,25 @@
 #!/bin/bash
-#
 
-if [ -f path.sh ]; then . ./path.sh; fi
-
-mkdir -p data/lang_test
+# This script formats ARPA LM into G.fst.
 
 arpa_lm=data/local/lm/3gram-mincount/lm_unpruned.gz
+dir=data/lang_test
+
+if [ -f ./path.sh ]; then . ./path.sh; fi
+. utils/parse_options.sh
+
 [ ! -f $arpa_lm ] && echo No such file $arpa_lm && exit 1;
 
-mkdir -p data/lang_test
-cp -r data/lang/* data/lang_test
+mkdir -p $dir
+cp -r data/lang/* $dir
 
 gunzip -c "$arpa_lm" | \
   arpa2fst --disambig-symbol=#0 \
-           --read-symbol-table=data/lang_test/words.txt - data/lang_test/G.fst
+           --read-symbol-table=$dir/words.txt - $dir/G.fst
 
 
 echo  "Checking how stochastic G is (the first of these numbers should be small):"
-fstisstochastic data/lang_test/G.fst
+fstisstochastic $dir/G.fst
 
 ## Check lexicon.
 ## just have a look and make sure it seems sane.
@@ -27,22 +29,21 @@ fstprint   --isymbols=data/lang/phones.txt --osymbols=data/lang/words.txt data/l
 echo Performing further checks
 
 # Checking that G.fst is determinizable.
-fstdeterminize data/lang_test/G.fst /dev/null || echo Error determinizing G.
+fstdeterminize $dir/G.fst /dev/null || echo Error determinizing G.
 
 # Checking that L_disambig.fst is determinizable.
-fstdeterminize data/lang_test/L_disambig.fst /dev/null || echo Error determinizing L.
+fstdeterminize $dir/L_disambig.fst /dev/null || echo Error determinizing L.
 
 # Checking that disambiguated lexicon times G is determinizable
 # Note: we do this with fstdeterminizestar not fstdeterminize, as
 # fstdeterminize was taking forever (presumbaly relates to a bug
 # in this version of OpenFst that makes determinization slow for
 # some case).
-fsttablecompose data/lang_test/L_disambig.fst data/lang_test/G.fst | \
+fsttablecompose $dir/L_disambig.fst $dir/G.fst | \
    fstdeterminizestar >/dev/null || echo Error
 
 # Checking that LG is stochastic:
-fsttablecompose data/lang/L_disambig.fst data/lang_test/G.fst | \
+fsttablecompose data/lang/L_disambig.fst $dir/G.fst | \
    fstisstochastic || echo "[log:] LG is not stochastic"
 
-
 echo "$0 succeeded"

egs/fisher_english/s5/local/fisher_train_lms_pocolm.sh

@@ -0,0 +1,160 @@
+#!/bin/bash
+
+# Copyright 2016  Vincent Nguyen
+#           2016  Johns Hopkins University (author: Daniel Povey)
+#           2017  Vimal Manohar
+# Apache 2.0
+#
+# This script is used to train LMs using pocolm toolkit. 
+# We use limit-unk-history=true, which truncates the history left of OOV word.
+# This ensure the graph is compact when using phone LM to model OOV word.
+# See the script local/run_unk_model.sh.
+
+set -e
+stage=0
+
+text=data/train/text
+lexicon=data/local/dict/lexicon.txt
+dir=data/local/pocolm
+
+num_ngrams_large=5000000
+num_ngrams_small=2500000
+
+echo "$0 $@"  # Print the command line for logging
+. utils/parse_options.sh || exit 1;
+
+lm_dir=${dir}/data
+
+mkdir -p $dir
+. ./path.sh || exit 1; # for KALDI_ROOT
+export PATH=$KALDI_ROOT/tools/pocolm/scripts:$PATH
+( # First make sure the pocolm toolkit is installed.
+ cd $KALDI_ROOT/tools || exit 1;
+ if [ -d pocolm ]; then
+   echo Not installing the pocolm toolkit since it is already there.
+ else
+   echo "$0: Please install the PocoLM toolkit with: "
+   echo " cd ../../../tools; extras/install_pocolm.sh; cd -"
+   exit 1;
+ fi
+) || exit 1;
+
+for f in "$text" "$lexicon"; do
+  [ ! -f $f ] && echo "$0: No such file $f" && exit 1;
+done
+
+num_dev_sentences=10000
+
+if [ $stage -le 0 ]; then
+  mkdir -p ${dir}/data
+  mkdir -p ${dir}/data/text
+
+  echo "$0: Getting the Data sources"
+
+  rm ${dir}/data/text/* 2>/dev/null || true
+
+  cleantext=$dir/text_all.gz
+
+  cut -d ' ' -f 2- $text | awk -v lex=$lexicon '
+  BEGIN{
+    while((getline<lex) >0) { seen[$1]=1; }
+  }
+  {
+    for(n=1; n<=NF;n++) {  
+      if (seen[$n]) { 
+        printf("%s ", $n); 
+      } else {
+        printf("<unk> ");
+      } 
+    }
+    printf("\n");
+  }' | gzip -c > $cleantext || exit 1;
+
+  # This is for reporting perplexities
+  gunzip -c $dir/text_all.gz | head -n $num_dev_sentences > \
+    ${dir}/data/test.txt
+
+  # use a subset of the annotated training data as the dev set .
+  # Note: the name 'dev' is treated specially by pocolm, it automatically
+  # becomes the dev set.
+  gunzip -c $dir/text_all.gz | tail -n +$[num_dev_sentences+1] | \
+    head -n $num_dev_sentences > ${dir}/data/text/dev.txt
+
+  gunzip -c $dir/text_all.gz | tail -n +$[2*num_dev_sentences+1] > \
+    ${dir}/data/text/train.txt
+
+  # for reporting perplexities, we'll use the "real" dev set.
+  # (a subset of the training data is used as ${dir}/data/text/dev.txt to work
+  # out interpolation weights.
+  # note, we can't put it in ${dir}/data/text/, because then pocolm would use
+  # it as one of the data sources.
+  cat data/dev/text data/test/text | cut -d " " -f 2- > ${dir}/data/real_dev_set.txt
+
+  cat $lexicon | awk '{print $1}' | sort | uniq  | awk '
+  {
+    if ($1 == "<s>") {
+      print "<s> is in the vocabulary!" | "cat 1>&2"
+      exit 1;
+    }
+    if ($1 == "</s>") {
+      print "</s> is in the vocabulary!" | "cat 1>&2"
+      exit 1;
+    }
+    printf("%s\n", $1);
+  }' > $dir/data/wordlist || exit 1;
+fi
+
+order=4
+wordlist=${dir}/data/wordlist
+
+lm_name="`basename ${wordlist}`_${order}"
+min_counts='train=1'
+if [ -n "${min_counts}" ]; then
+  lm_name+="_`echo ${min_counts} | tr -s "[:blank:]" "_" | tr "=" "-"`"
+fi
+
+unpruned_lm_dir=${lm_dir}/${lm_name}.pocolm
+
+if [ $stage -le 1 ]; then
+  # decide on the vocabulary.
+  # Note: you'd use --wordlist if you had a previously determined word-list
+  # that you wanted to use.
+  # Note: if you have more than one order, use a certain amount of words as the
+  # vocab and want to restrict max memory for 'sort',
+  echo "$0: training the unpruned LM"
+  train_lm.py  --wordlist=${wordlist} --num-splits=10 --warm-start-ratio=20  \
+               --limit-unk-history=true \
+               --fold-dev-into=train ${bypass_metaparam_optim_opt} \
+               --min-counts="${min_counts}" \
+               ${dir}/data/text ${order} ${lm_dir}/work ${unpruned_lm_dir}
+
+  get_data_prob.py ${dir}/data/test.txt ${unpruned_lm_dir} 2>&1 | grep -F '[perplexity' | tee ${unpruned_lm_dir}/perplexity_test.log
+
+  get_data_prob.py ${dir}/data/real_dev_set.txt ${unpruned_lm_dir} 2>&1 | grep -F '[perplexity' | tee ${unpruned_lm_dir}/perplexity_real_dev_set.log
+fi
+
+if [ $stage -le 2 ]; then
+  echo "$0: pruning the LM (to larger size)"
+  # Using 5 million n-grams for a big LM for rescoring purposes.
+  prune_lm_dir.py --target-num-ngrams=$num_ngrams_large --initial-threshold=0.02 ${unpruned_lm_dir} ${dir}/data/lm_${order}_prune_big
+
+  get_data_prob.py ${dir}/data/test.txt ${dir}/data/lm_${order}_prune_big 2>&1 | grep -F '[perplexity' | tee ${dir}/data/lm_${order}_prune_big/perplexity_test.log 
+
+  get_data_prob.py ${dir}/data/real_dev_set.txt ${dir}/data/lm_${order}_prune_big 2>&1 | grep -F '[perplexity' | tee ${dir}/data/lm_${order}_prune_big/perplexity_real_dev_set.log
+
+  mkdir -p ${dir}/data/arpa
+  format_arpa_lm.py ${dir}/data/lm_${order}_prune_big | gzip -c > ${dir}/data/arpa/${order}gram_big.arpa.gz
+fi
+
+if [ $stage -le 3 ]; then
+  echo "$0: pruning the LM (to smaller size)"
+  # Using 2.5 million n-grams for a smaller LM for graph building.  
+  # Prune from the bigger-pruned LM, it'll be faster.
+  prune_lm_dir.py --target-num-ngrams=$num_ngrams_small ${dir}/data/lm_${order}_prune_big ${dir}/data/lm_${order}_prune_small
+
+  get_data_prob.py ${dir}/data/test.txt ${dir}/data/lm_${order}_prune_small 2>&1 | grep -F '[perplexity' | tee ${dir}/data/lm_${order}_prune_small/perplexity_test.log 
+
+  get_data_prob.py ${dir}/data/real_dev_set.txt ${dir}/data/lm_${order}_prune_small 2>&1 | grep -F '[perplexity' | tee ${dir}/data/lm_${order}_prune_small/perplexity_real_dev_set.log
+
+  format_arpa_lm.py ${dir}/data/lm_${order}_prune_small | gzip -c > ${dir}/data/arpa/${order}gram_small.arpa.gz
+fi