init for demo

Change-Id: I0d93b08847007cd575b5798639f20f0565a20f8c

fcclip/modeling/pixel_decoder/ops/modules/ms_deform_attn.py

@@ -21,7 +21,10 @@ from torch import nn
 import torch.nn.functional as F
 from torch.nn.init import xavier_uniform_, constant_
 
-from ..functions import MSDeformAttnFunction
+try:
+    from ..functions import MSDeformAttnFunction
+except:
+    pass
 from ..functions.ms_deform_attn_func import ms_deform_attn_core_pytorch