add make_syllable_lexicon and handle heteronym

egs/wenetspeech/ASR/local/make_syllable_lexicon.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+
+# Copyright 2022 (Author: Pingfeng Luo)
+"""
+    make syllables lexicon and handle heteronym
+"""
+import argparse
+from pathlib import Path
+from pypinyin import pinyin, Style
+
+
+def get_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--lexicon", type=str, help="The input lexicon file.")
+    return parser.parse_args()
+
+
+def process_line(
+    line: str
+) -> None:
+    """
+    Args:
+      line:
+        A line of transcript consisting of space(s) separated word and phones
+        input :
+        你好 n i3 h ao3
+        晴天 q ing2 t ian1
+
+        output :
+        你好 ni3 hao3
+        晴天 qing2 tian1
+    Returns:
+      Return None.
+    """
+    chars = line.strip().split()[0]
+    pinyins = pinyin(chars, style=Style.TONE3, heteronym=True)
+    word_syllables = []
+    word_syllables_num = 1
+    inited = False
+    for char_syllables in pinyins:
+        new_char_syllables_num = len(char_syllables)
+        if not inited and len(char_syllables):
+            word_syllables = char_syllables
+            inited = True
+        elif new_char_syllables_num == 1:
+            for i in range(word_syllables_num):
+                word_syllables[i] += " " + str(char_syllables)
+        elif new_char_syllables_num > 1:
+            word_syllables = word_syllables * new_char_syllables_num
+            for pre_index in range(word_syllables_num):
+                for expand_index in range(new_char_syllables_num):
+                    word_syllables[pre_index * new_char_syllables_num
+                                   + expand_index] += " "
+                    + str(char_syllables[expand_index])
+        word_syllables_num *= new_char_syllables_num
+
+    for word_syallable in word_syllables:
+        print("{} {}".format(chars.strip(),  str(word_syallable).strip()))
+
+
+def main():
+    args = get_args()
+    assert Path(args.lexicon).is_file()
+
+    with open(args.lexicon) as f:
+        for line in f:
+            process_line(line=line)
+
+
+if __name__ == "__main__":
+    main()