[to #42322933][bug fix] convert gemm output torch tensor to numpy array for demo support

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10342977

modelscope/models/multi_modal/gemm/gemm_base.py

@@ -543,6 +543,7 @@ class GEMMModel(nn.Module):
         img_feature, text_feature, caption = None, None, None
         if captioning and image is not None:
             img_feature, caption = self.model.image_to_text(image)
+            img_feature = self.parse_feat(img_feature)
         elif image is not None:
             img_feature = self.parse_feat(self.model.encode_image(image))
         if text is not None: