#!/bin/bash

. ./path.sh

echo Preparing language models for test

for lm_suffix in tg; do
  test=data/lang_test_${lm_suffix}

  rm -rf data/lang_test_${lm_suffix}
  cp -r data/lang data/lang_test_${lm_suffix}

  arpa2fst --disambig-symbol=#0 --read-symbol-table=$test/words.txt input/task.arpabo $test/G.fst

  fstisstochastic $test/G.fst

 # The output is like:
 # 9.14233e-05 -0.259833
 # we do expect the first of these 2 numbers to be close to zero (the second is
 # nonzero because the backoff weights make the states sum to >1).
 # Because of the <s> fiasco for these particular LMs, the first number is not
 # as close to zero as it could be.

  # Everything below is only for diagnostic.
  # Checking that G has no cycles with empty words on them (e.g. <s>, </s>);
  # this might cause determinization failure of CLG.
  # #0 is treated as an empty word.
  mkdir -p tmpdir.g
  awk '{if(NF==1){ printf("0 0 %s %s\n", $1,$1); }} END{print "0 0 #0 #0"; print "0";}' \
    < data/local/dict/lexicon.txt  >tmpdir.g/select_empty.fst.txt
  fstcompile --isymbols=$test/words.txt --osymbols=$test/words.txt tmpdir.g/select_empty.fst.txt | \
   fstarcsort --sort_type=olabel | fstcompose - $test/G.fst > tmpdir.g/empty_words.fst
  fstinfo tmpdir.g/empty_words.fst | grep cyclic | grep -w 'y' &&
    echo "Language model has cycles with empty words" && exit 1
  rm -r tmpdir.g
done

echo "Succeeded in formatting data."