From abc687b3b934bf082d9ec9f60283c8f3733a4409 Mon Sep 17 00:00:00 2001
From: Reuben Morais <reuben.morais@gmail.com>
Date: Mon, 14 Oct 2019 16:23:06 +0200
Subject: [PATCH] Specify BOS for final scoring at decode if applicable

---
 native_client/ctcdecode/ctc_beam_search_decoder.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/native_client/ctcdecode/ctc_beam_search_decoder.cpp b/native_client/ctcdecode/ctc_beam_search_decoder.cpp
index a5f9cb27..856ca4a2 100644
--- a/native_client/ctcdecode/ctc_beam_search_decoder.cpp
+++ b/native_client/ctcdecode/ctc_beam_search_decoder.cpp
@@ -170,7 +170,8 @@ DecoderState::decode() const
       if (!prefix->is_empty() && prefix->character != space_id_) {
         float score = 0.0;
         std::vector<std::string> ngram = ext_scorer_->make_ngram(prefix);
-        score = ext_scorer_->get_log_cond_prob(ngram) * ext_scorer_->alpha;
+        bool bos = ngram.size() < ext_scorer_->get_max_order();
+        score = ext_scorer_->get_log_cond_prob(ngram, bos) * ext_scorer_->alpha;
         score += ext_scorer_->beta;
         scores[prefix] += score;
       }