From 7607b0a7873f52d6e3ea387bf88c773cbb55f8ee Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <github@kheafield.com>
Date: Thu, 18 Aug 2011 12:14:01 +0100
Subject: KenLM update: Bhiksha's trick, simple test for lms without unk,
 auto-detect binary files instead of requiring them to be specified at
 runtime.

---
 klm/lm/model.cc | 67 ++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 38 insertions(+), 29 deletions(-)

(limited to 'klm/lm/model.cc')

diff --git a/klm/lm/model.cc b/klm/lm/model.cc
index a1d10b3d..27e24b1c 100644
--- a/klm/lm/model.cc
+++ b/klm/lm/model.cc
@@ -21,6 +21,8 @@ size_t hash_value(const State &state) {
 
 namespace detail {
 
+template <class Search, class VocabularyT> const ModelType GenericModel<Search, VocabularyT>::kModelType = Search::kModelType;
+
 template <class Search, class VocabularyT> size_t GenericModel<Search, VocabularyT>::Size(const std::vector<uint64_t> &counts, const Config &config) {
   return VocabularyT::Size(counts[0], config) + Search::Size(counts, config);
 }
@@ -56,35 +58,40 @@ template <class Search, class VocabularyT> void GenericModel<Search, VocabularyT
 template <class Search, class VocabularyT> void GenericModel<Search, VocabularyT>::InitializeFromARPA(const char *file, const Config &config) {
   // Backing file is the ARPA.  Steal it so we can make the backing file the mmap output if any.  
   util::FilePiece f(backing_.file.release(), file, config.messages);
-  std::vector<uint64_t> counts;
-  // File counts do not include pruned trigrams that extend to quadgrams etc.   These will be fixed by search_.
-  ReadARPACounts(f, counts);
-
-  if (counts.size() > kMaxOrder) UTIL_THROW(FormatLoadException, "This model has order " << counts.size() << ".  Edit lm/max_order.hh, set kMaxOrder to at least this value, and recompile.");
-  if (counts.size() < 2) UTIL_THROW(FormatLoadException, "This ngram implementation assumes at least a bigram model.");
-  if (config.probing_multiplier <= 1.0) UTIL_THROW(ConfigException, "probing multiplier must be > 1.0");
-
-  std::size_t vocab_size = VocabularyT::Size(counts[0], config);
-  // Setup the binary file for writing the vocab lookup table.  The search_ is responsible for growing the binary file to its needs.  
-  vocab_.SetupMemory(SetupJustVocab(config, counts.size(), vocab_size, backing_), vocab_size, counts[0], config);
-
-  if (config.write_mmap) {
-    WriteWordsWrapper wrap(config.enumerate_vocab);
-    vocab_.ConfigureEnumerate(&wrap, counts[0]);
-    search_.InitializeFromARPA(file, f, counts, config, vocab_, backing_);
-    wrap.Write(backing_.file.get());
-  } else {
-    vocab_.ConfigureEnumerate(config.enumerate_vocab, counts[0]);
-    search_.InitializeFromARPA(file, f, counts, config, vocab_, backing_);
-  }
+  try {
+    std::vector<uint64_t> counts;
+    // File counts do not include pruned trigrams that extend to quadgrams etc.   These will be fixed by search_.
+    ReadARPACounts(f, counts);
+
+    if (counts.size() > kMaxOrder) UTIL_THROW(FormatLoadException, "This model has order " << counts.size() << ".  Edit lm/max_order.hh, set kMaxOrder to at least this value, and recompile.");
+    if (counts.size() < 2) UTIL_THROW(FormatLoadException, "This ngram implementation assumes at least a bigram model.");
+    if (config.probing_multiplier <= 1.0) UTIL_THROW(ConfigException, "probing multiplier must be > 1.0");
+
+    std::size_t vocab_size = VocabularyT::Size(counts[0], config);
+    // Setup the binary file for writing the vocab lookup table.  The search_ is responsible for growing the binary file to its needs.  
+    vocab_.SetupMemory(SetupJustVocab(config, counts.size(), vocab_size, backing_), vocab_size, counts[0], config);
+
+    if (config.write_mmap) {
+      WriteWordsWrapper wrap(config.enumerate_vocab);
+      vocab_.ConfigureEnumerate(&wrap, counts[0]);
+      search_.InitializeFromARPA(file, f, counts, config, vocab_, backing_);
+      wrap.Write(backing_.file.get());
+    } else {
+      vocab_.ConfigureEnumerate(config.enumerate_vocab, counts[0]);
+      search_.InitializeFromARPA(file, f, counts, config, vocab_, backing_);
+    }
 
-  if (!vocab_.SawUnk()) {
-    assert(config.unknown_missing != THROW_UP);
-    // Default probabilities for unknown.  
-    search_.unigram.Unknown().backoff = 0.0;
-    search_.unigram.Unknown().prob = config.unknown_missing_logprob;
+    if (!vocab_.SawUnk()) {
+      assert(config.unknown_missing != THROW_UP);
+      // Default probabilities for unknown.  
+      search_.unigram.Unknown().backoff = 0.0;
+      search_.unigram.Unknown().prob = config.unknown_missing_logprob;
+    }
+    FinishFile(config, kModelType, counts, backing_);
+  } catch (util::Exception &e) {
+    e << " Byte: " << f.Offset();
+    throw;
   }
-  FinishFile(config, kModelType, counts, backing_);
 }
 
 template <class Search, class VocabularyT> FullScoreReturn GenericModel<Search, VocabularyT>::FullScore(const State &in_state, const WordIndex new_word, State &out_state) const {
@@ -225,8 +232,10 @@ template <class Search, class VocabularyT> FullScoreReturn GenericModel<Search,
 }
 
 template class GenericModel<ProbingHashedSearch, ProbingVocabulary>;  // HASH_PROBING
-template class GenericModel<trie::TrieSearch<DontQuantize>, SortedVocabulary>; // TRIE_SORTED
-template class GenericModel<trie::TrieSearch<SeparatelyQuantize>, SortedVocabulary>; // TRIE_SORTED_QUANT
+template class GenericModel<trie::TrieSearch<DontQuantize, trie::DontBhiksha>, SortedVocabulary>; // TRIE_SORTED
+template class GenericModel<trie::TrieSearch<DontQuantize, trie::ArrayBhiksha>, SortedVocabulary>;
+template class GenericModel<trie::TrieSearch<SeparatelyQuantize, trie::DontBhiksha>, SortedVocabulary>; // TRIE_SORTED_QUANT
+template class GenericModel<trie::TrieSearch<SeparatelyQuantize, trie::ArrayBhiksha>, SortedVocabulary>;
 
 } // namespace detail
 } // namespace ngram
-- 
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