diff --git a/tortoise/models/autoregressive.py b/tortoise/models/autoregressive.py
index 4c91534..7483d45 100644
--- a/tortoise/models/autoregressive.py
+++ b/tortoise/models/autoregressive.py
@@ -375,14 +375,14 @@ class UnifiedVoice(nn.Module):
             self.mel_head,
             kv_cache=kv_cache,
         )
-        if use_deepspeed and half and torch.backends.cuda.is_available():
+        if use_deepspeed and half and torch.cuda.is_available():
             import deepspeed
             self.ds_engine = deepspeed.init_inference(model=self.inference_model,  
                                                     mp_size=1,
                                                     replace_with_kernel_inject=True,
                                                     dtype=torch.float16)
             self.inference_model = self.ds_engine.module.eval()
-        elif use_deepspeed and torch.backends.cuda.is_available():
+        elif use_deepspeed and torch.cuda.is_available():
             import deepspeed
             self.ds_engine = deepspeed.init_inference(model=self.inference_model,  
                                                     mp_size=1,