Support device

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

panns.py

@@ -43,9 +43,13 @@ class Panns(NNOperator):
                  weights_path: str = None,
                  framework: str = 'pytorch',
                  sample_rate: int = 32000,
+                 device: str = None,
                  topk: int = 5):
         super().__init__(framework=framework)
-        self.device = "cuda" if torch.cuda.is_available() else "cpu"
+        if device:
+            self.device = device
+        else:
+            self.device = 'cuda' if torch.cuda.is_available() else 'cpu'
         self.sample_rate = sample_rate
         self.topk = topk
         # checkpoint_path=None will download model weights with default url