fix: make chinese g2p deps optional

README.md

@@ -159,9 +159,10 @@ The following extras allow the installation of optional dependencies:
 | `server` | Dependencies to run the TTS server |
 | `bn` | Bangla G2P |
 | `ja` | Japanese G2P |
+| `zh` | Chinese G2P |
 | `languages` | All language-specific dependencies |
 
-You can install them with one of the following commands:
+You can install extras with one of the following commands:
 
 ```bash
 pip install coqui-tts[server,ja]

TTS/tts/layers/xtts/tokenizer.py

@@ -4,7 +4,6 @@
 import textwrap
 from functools import cached_property
 
-import pypinyin
 import torch
 from hangul_romanize import Transliter
 from hangul_romanize.rule import academic
@@ -577,6 +576,10 @@ def basic_cleaners(text):
 
 
 def chinese_transliterate(text):
+    try:
+        import pypinyin
+    except ImportError as e:
+        raise ImportError("Chinese requires: pypinyin") from e
     return "".join(
         [p[0] for p in pypinyin.pinyin(text, style=pypinyin.Style.TONE3, heteronym=False, neutral_tone_with_five=True)]
     )

TTS/tts/utils/text/chinese_mandarin/phonemizer.py

@@ -1,7 +1,10 @@
 from typing import List
 
-import jieba
-import pypinyin
+try:
+    import jieba
+    import pypinyin
+except ImportError as e:
+    raise ImportError("Chinese requires: jieba, pypinyin") from e
 
 from .pinyinToPhonemes import PINYIN_DICT
 

pyproject.toml

@@ -65,9 +65,6 @@ dependencies = [
     # Coqui stack
     "coqui-tts-trainer>=0.1",
     "coqpit>=0.0.16",
-    # Chinese
-    "jieba",
-    "pypinyin",
     # Korean
     "hangul_romanize",
     "jamo",
@@ -123,6 +120,11 @@ ja = [
     "unidic-lite==1.0.8",
     "cutlet",
 ]
+# Chinese
+zh = [
+    "jieba",
+    "pypinyin",
+]
 # All language-specific dependencies
 languages = [
     "coqui-tts[bn,ja]",