Adapt get_pretrained_cfg with towhee of lower version

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

isc.py

@@ -30,7 +30,14 @@ import torch
 from torch import nn
 from PIL import Image as PILImage
 from timm.data import create_transform
-from timm.models import create_model, get_pretrained_cfg
+from timm import create_model
+
+try:
+    from timm.models import get_pretrained_cfg
+except ImportError:
+    from timm.models.registry import _model_default_cfgs
+    def get_pretrained_cfg(model_name):
+        return _model_default_cfgs[model_name]
 
 warnings.filterwarnings('ignore')
 log = logging.getLogger('isc_op')