Handle missing JA phonemizer (#2843)

* Handle missing JA phonemizer

* Make style

TTS/tts/layers/bark/inference_funcs.py

@@ -162,7 +162,7 @@ def generate_text_semantic(
     allow_early_stop=True,
     base=None,
     use_kv_caching=True,
-    **kwargs, # pylint: disable=unused-argument
+    **kwargs,  # pylint: disable=unused-argument
 ):
     """Generate semantic tokens from text.
 

TTS/tts/utils/text/phonemizers/__init__.py

@@ -2,11 +2,16 @@
 from TTS.tts.utils.text.phonemizers.base import BasePhonemizer
 from TTS.tts.utils.text.phonemizers.espeak_wrapper import ESpeak
 from TTS.tts.utils.text.phonemizers.gruut_wrapper import Gruut
-from TTS.tts.utils.text.phonemizers.ja_jp_phonemizer import JA_JP_Phonemizer
 from TTS.tts.utils.text.phonemizers.ko_kr_phonemizer import KO_KR_Phonemizer
 from TTS.tts.utils.text.phonemizers.zh_cn_phonemizer import ZH_CN_Phonemizer
 
-PHONEMIZERS = {b.name(): b for b in (ESpeak, Gruut, JA_JP_Phonemizer)}
+try:
+    from TTS.tts.utils.text.phonemizers.ja_jp_phonemizer import JA_JP_Phonemizer
+except ImportError:
+    JA_JP_Phonemizer = None
+    pass
+
+PHONEMIZERS = {b.name(): b for b in (ESpeak, Gruut, KO_KR_Phonemizer, BN_Phonemizer)}
 
 
 ESPEAK_LANGS = list(ESpeak.supported_languages().keys())
@@ -24,14 +29,21 @@
 _new_dict = dict(list(zip(list(ESPEAK_LANGS), _)))
 DEF_LANG_TO_PHONEMIZER.update(_new_dict)
 
+
 # Force default for some languages
 DEF_LANG_TO_PHONEMIZER["en"] = DEF_LANG_TO_PHONEMIZER["en-us"]
-DEF_LANG_TO_PHONEMIZER["ja-jp"] = JA_JP_Phonemizer.name()
 DEF_LANG_TO_PHONEMIZER["zh-cn"] = ZH_CN_Phonemizer.name()
 DEF_LANG_TO_PHONEMIZER["ko-kr"] = KO_KR_Phonemizer.name()
 DEF_LANG_TO_PHONEMIZER["bn"] = BN_Phonemizer.name()
 
 
+# JA phonemizer has deal breaking dependencies like MeCab for some systems.
+# So we only have it when we have it.
+if JA_JP_Phonemizer is not None:
+    PHONEMIZERS[JA_JP_Phonemizer.name()] = JA_JP_Phonemizer
+    DEF_LANG_TO_PHONEMIZER["ja-jp"] = JA_JP_Phonemizer.name()
+
+
 def get_phonemizer_by_name(name: str, **kwargs) -> BasePhonemizer:
     """Initiate a phonemizer by name
 
@@ -49,6 +61,8 @@ def get_phonemizer_by_name(name: str, **kwargs) -> BasePhonemizer:
     if name == "zh_cn_phonemizer":
         return ZH_CN_Phonemizer(**kwargs)
     if name == "ja_jp_phonemizer":
+        if JA_JP_Phonemizer is None:
+            raise ValueError(" ❗ You need to install JA phonemizer dependencies. Try `pip install TTS[ja]`.")
         return JA_JP_Phonemizer(**kwargs)
     if name == "ko_kr_phonemizer":
         return KO_KR_Phonemizer(**kwargs)