fix: drop the leading space on Latin sentence timestamps

funasr/utils/timestamp_tools.py

@@ -189,6 +189,11 @@ def timestamp_sentence(
 
         punc_id = int(punc_id) if punc_id is not None else 1
         sentence_end = timestamp[1] if timestamp is not None else sentence_end
+        # Latin tokens are inserted with a leading space. Drop one leading
+        # space, as timestamp_sentence_en does, so a sentence that starts
+        # with an English word is not stored as " iphone...".
+        if sentence_text.startswith(" "):
+            sentence_text = sentence_text[1:]
         if punc_id > 1:
             sentence_text += punc_list[punc_id - 2]
             if sentence_text_seg.endswith(" "):

tests/test_timestamp_tools.py

@@ -57,6 +57,31 @@ def test_timestamp_sentence_en_missing_trailing_timestamp_matches_zh_fallback():
     assert en_result[1]["start"] == zh_result[1]["start"]
 
 
+def test_timestamp_sentence_does_not_prefix_latin_text_with_a_space():
+    mixed = timestamp_sentence(
+        punc_id_list=[1, 2, 1, 1, 3],
+        timestamp_postprocessed=[[0, 100], [100, 200], [200, 300], [300, 400], [400, 500]],
+        text_postprocessed="我 用 iphone pro max",
+        return_raw_text=True,
+    )
+    assert [sentence["text"] for sentence in mixed] == ["我用，", "iphone pro max。"]
+    assert [sentence["raw_text"] for sentence in mixed] == ["我 用", "iphone pro max"]
+
+    english = timestamp_sentence(
+        [1, 3, 1],
+        [[0, 100], [100, 200], [200, 300]],
+        "hello world again",
+    )
+    assert [sentence["text"] for sentence in english] == ["hello world。", "again"]
+
+    chinese = timestamp_sentence(
+        [1, 3],
+        [[0, 100], [100, 200]],
+        "你好 世界",
+    )
+    assert chinese[0]["text"] == "你好世界。"
+
+
 def test_timestamp_sentence_raw_text_keeps_token_separators():
     result = timestamp_sentence(
         punc_id_list=[1, 2, 1, 1, 3],