From 119f9091ea60d81efabd7d20ff2490b9e7084778 Mon Sep 17 00:00:00 2001
From: Eric Bi <sxk.achilles@gmail.com>
Date: Tue, 1 Dec 2015 17:03:39 +0800
Subject: add detection of utterances without alignment, and skip them

---
 kaldi_io/init.lua               | 8 ++++++++
 kaldi_io/src/cwrapper_kaldi.cpp | 8 ++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/kaldi_io/init.lua b/kaldi_io/init.lua
index e538ee5..5193504 100644
--- a/kaldi_io/init.lua
+++ b/kaldi_io/init.lua
@@ -36,6 +36,7 @@ function KaldiReader:__init(global_conf, reader_conf)
 end
 
 function KaldiReader:get_data()
+    local fail_to_read_alignment = false
     if self.feat_repo:is_end() then
         return nil
     end
@@ -75,6 +76,9 @@ function KaldiReader:get_data()
         local lab_utter = repo:get_utter(self.feat_repo,
                                         feat_utter:nrow(),
                                         self.debug)
+        if lab_utter == nil then
+            fail_to_read_alignment = true
+        end
         res[id] = lab_utter
     end
     -- add corresponding lookup features
@@ -98,5 +102,9 @@ function KaldiReader:get_data()
     -- move the pointer to next
     self.feat_repo:next()
     collectgarbage("collect")
+    if fail_to_read_alignment then
+        nerv.info("[Kaldi IO] utterance %s alignment not found, skip it.", self.feat_repo:key())
+        res = self:get_data()
+    end
     return res
 end
diff --git a/kaldi_io/src/cwrapper_kaldi.cpp b/kaldi_io/src/cwrapper_kaldi.cpp
index d16f316..542f1d0 100644
--- a/kaldi_io/src/cwrapper_kaldi.cpp
+++ b/kaldi_io/src/cwrapper_kaldi.cpp
@@ -150,8 +150,12 @@ extern "C" {
     Matrix *kaldi_label_repo_read_utterance(KaldiLabelRepo *repo, KaldiFeatureRepo *frepo, int nframes,
                                             lua_State *L,
                                             int debug) {
-        Matrix *mat;
-        kaldi::Posterior targets = repo->targets_reader->Value(frepo->utt);
+        Matrix *mat = NULL;
+        /* check if the alignment of the utterance exists, otherwise return NULL */
+        kaldi::Posterior targets;
+        if (repo->targets_reader->HasKey(frepo->utt))
+            targets = repo->targets_reader->Value(frepo->utt);
+        else return mat;
 
         int n = targets.size() < nframes ? targets.size() : nframes;
         int m = (int)targets[0].size();
-- 
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