fix(npu): ascend sampling real speaker (#788)

Co-authored-by: shanshan shen <[email protected]>

ChatTTS/core.py

@@ -268,17 +268,19 @@ def _load(
         self.vocos = vocos
         self.logger.log(logging.INFO, "vocos loaded.")
 
+        # computation of MelSpectrogram on npu is not support now, use cpu fallback.
+        dvae_device = torch.device("cpu") if "npu" in str(self.device) else device
         dvae = DVAE(
             decoder_config=asdict(self.config.dvae.decoder),
             encoder_config=asdict(self.config.dvae.encoder),
             vq_config=asdict(self.config.dvae.vq),
             dim=self.config.dvae.decoder.idim,
             coef=coef,
-            device=device,
+            device=dvae_device,
         )
         coef = str(dvae)
         assert dvae_ckpt_path, "dvae_ckpt_path should not be None"
-        dvae.load_pretrained(dvae_ckpt_path, device)
+        dvae.load_pretrained(dvae_ckpt_path, dvae_device)
         self.dvae = dvae.eval()
         self.logger.log(logging.INFO, "dvae loaded.")