feat(utils): add NPU Support (#777)

ChatTTS/core.py

@@ -253,9 +253,11 @@ class Chat:
         vocos = (
             Vocos(feature_extractor=feature_extractor, backbone=backbone, head=head)
             .to(
-                # vocos on mps will crash, use cpu fallback
+                # Vocos on mps will crash, use cpu fallback.
+                # Plus, complex dtype used in the decode process of Vocos is not supported in torch_npu now,
+                # so we put this calculation of data on CPU instead of NPU.
                 "cpu"
-                if "mps" in str(device)
+                if "mps" in str(device) or "npu" in str(device)
                 else device
             )
             .eval()
@@ -422,7 +424,7 @@ class Chat:
 
     @torch.inference_mode()
     def _vocos_decode(self, spec: torch.Tensor) -> np.ndarray:
-        if "mps" in str(self.device):
+        if "mps" in str(self.device) or "npu" in str(self.device):
             return self.vocos.decode(spec.cpu()).cpu().numpy()
         else:
             return self.vocos.decode(spec).cpu().numpy()

ChatTTS/utils/gpu.py

@@ -1,5 +1,10 @@
 import torch
 
+try:
+    import torch_npu
+except ImportError:
+    pass
+
 from .log import logger
 
 
@@ -21,6 +26,26 @@ def select_device(min_memory=2047, experimental=False):
             device = torch.device("cpu")
         else:
             device = torch.device(f"cuda:{selected_gpu}")
+    elif _is_torch_npu_available():
+        """
+        Using Ascend NPU to accelerate the process of inferencing when GPU is not found.
+        """
+        selected_npu = 0
+        max_free_memory = -1
+        for i in range(torch.npu.device_count()):
+            props = torch.npu.get_device_properties(i)
+            free_memory = props.total_memory - torch.npu.memory_reserved(i)
+            if max_free_memory < free_memory:
+                selected_npu = i
+                max_free_memory = free_memory
+        free_memory_mb = max_free_memory / (1024 * 1024)
+        if free_memory_mb < min_memory:
+            logger.get_logger().warning(
+                f"NPU {selected_npu} has {round(free_memory_mb, 2)} MB memory left. Switching to CPU."
+            )
+            device = torch.device("cpu")
+        else:
+            device = torch.device(f"npu:{selected_npu}")
     elif torch.backends.mps.is_available():
         """
         Currently MPS is slower than CPU while needs more memory and core utility,
@@ -34,7 +59,16 @@ def select_device(min_memory=2047, experimental=False):
             logger.get_logger().info("found Apple GPU, but use CPU.")
             device = torch.device("cpu")
     else:
-        logger.get_logger().warning("no GPU found, use CPU instead")
+        logger.get_logger().warning("no GPU or NPU found, use CPU instead")
         device = torch.device("cpu")
 
     return device
+
+
+def _is_torch_npu_available():
+    try:
+        # will raise a AttributeError if torch_npu is not imported or a RuntimeError if no NPU found
+        _ = torch.npu.device_count()
+        return torch.npu.is_available()
+    except (AttributeError, RuntimeError):
+        return False