Fix punctuation (#976)

.github/workflows/sanitizer.yaml

@@ -76,6 +76,14 @@ jobs:
           otool -L build/bin/sherpa-onnx
           otool -l build/bin/sherpa-onnx
 
+      - name: Test offline punctuation
+        shell: bash
+        run: |
+          export PATH=$PWD/build/bin:$PATH
+          export EXE=sherpa-onnx-offline-punctuation
+
+          .github/scripts/test-offline-punctuation.sh
+
       - name: Test offline transducer
         shell: bash
         run: |
@@ -92,13 +100,7 @@ jobs:
 
           .github/scripts/test-online-ctc.sh
 
-      - name: Test offline punctuation
-        shell: bash
-        run: |
-          export PATH=$PWD/build/bin:$PATH
-          export EXE=sherpa-onnx-offline-punctuation
 
-          .github/scripts/test-offline-punctuation.sh
 
       - name: Test C API
         shell: bash

sherpa-onnx/csrc/offline-punctuation-ct-transformer-impl.h

@@ -69,8 +69,8 @@ class OfflinePunctuationCtTransformerImpl : public OfflinePunctuationImpl {
     std::vector<int32_t> punctuations;
     int32_t last = -1;
     for (int32_t i = 0; i != num_segments; ++i) {
-      int32_t this_start = i * segment_size;         // inclusive
-      int32_t this_end = this_start + segment_size;  // exclusive
+      int32_t this_start = i * segment_size;         // included
+      int32_t this_end = this_start + segment_size;  // not included
       if (this_end > static_cast<int32_t>(token_ids.size())) {
         this_end = token_ids.size();
       }
@@ -113,7 +113,8 @@ class OfflinePunctuationCtTransformerImpl : public OfflinePunctuationImpl {
       int32_t dot_index = -1;
       int32_t comma_index = -1;
 
-      for (int32_t m = this_punctuations.size() - 2; m >= 1; --m) {
+      for (int32_t m = static_cast<int32_t>(this_punctuations.size()) - 2;
+           m >= 1; --m) {
         int32_t punct_id = this_punctuations[m];
 
         if (punct_id == meta_data.dot_id || punct_id == meta_data.quest_id) {
@@ -137,13 +138,13 @@ class OfflinePunctuationCtTransformerImpl : public OfflinePunctuationImpl {
         }
 
         if (i == num_segments - 1) {
-          dot_index = token_ids.size() - 1;
+          dot_index = static_cast<int32_t>(this_punctuations.size()) - 1;
         }
       } else {
         last = this_start + dot_index + 1;
       }
 
-      if (dot_index != 1) {
+      if (dot_index != -1) {
         punctuations.insert(punctuations.end(), this_punctuations.begin(),
                             this_punctuations.begin() + (dot_index + 1));
       }