lazy import cartesia

Author: rjheeta

vocode/streaming/synthesizer/cartesia_synthesizer.py

@@ -1,21 +1,26 @@
 import io
 import wave
 
-from cartesia.tts import AsyncCartesiaTTS
-
 from vocode import getenv
 from vocode.streaming.models.message import BaseMessage
 from vocode.streaming.models.synthesizer import CartesiaSynthesizerConfig
 from vocode.streaming.synthesizer.base_synthesizer import BaseSynthesizer, SynthesisResult
 
 
 class CartesiaSynthesizer(BaseSynthesizer[CartesiaSynthesizerConfig]):
+    cartesia_tts = None
+
     def __init__(
         self,
         synthesizer_config: CartesiaSynthesizerConfig,
     ):
         super().__init__(synthesizer_config)
 
+        # Lazy import the cartesia module
+        if CartesiaSynthesizer.cartesia_tts is None:
+            from cartesia.tts import AsyncCartesiaTTS
+            CartesiaSynthesizer.cartesia_tts = AsyncCartesiaTTS
+
         self.api_key = getenv("CARTESIA_API_KEY")
         self.model_id = synthesizer_config.model_id
         self.voice_id = synthesizer_config.voice_id