Allow to pass checkpoint path

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

timm_image.py

@@ -54,9 +54,13 @@ def torch_no_grad(f):
 
 @accelerate
 class Model:
-    def __init__(self, model_name, device, num_classes):
+    def __init__(self, model_name, device, num_classes, checkpoint_path=None):
         self.device = device
-        self.model = create_model(model_name, pretrained=True, num_classes=num_classes)
+        if checkpoint_path:
+            assert os.path.exists(checkpoint_path), f'File not found: {checkpoint_path}'
+            self.model = create_model(model_name, checkpoint_path, num_classes=num_classes)
+        else:
+            self.model = create_model(model_name, pretrained=True, num_classes=num_classes)        
         self.model.eval()
         self.model.to(device)
 
@@ -81,7 +85,8 @@ class TimmImage(NNOperator):
                  model_name: str = None,
                  num_classes: int = 1000,
                  skip_preprocess: bool = False,
-                 device: str = None
+                 device: str = None,
+                 checkpoint_path: str = None
                  ) -> None:
         super().__init__()
         if device is None:
@@ -92,7 +97,8 @@ class TimmImage(NNOperator):
             self.model = Model(
                 model_name=model_name,
                 device=self.device,
-                num_classes=num_classes
+                num_classes=num_classes,
+                checkpoint_path=checkpoint_path
             )
             try:
                 self.tfms = create_transform(