flatten the output vector.

Signed-off-by: wxywb <xy.wang@zilliz.com>

clip.py

@@ -49,7 +49,7 @@ class Clip(NNOperator):
             vec = self._inference_from_text(data)
         else:
             raise ValueError("modality[{}] not implemented.".format(self._modality))
-        return vec.detach().cpu().numpy()
+        return vec.detach().cpu().numpy().flatten()
 
     def _inference_from_text(self, text):
         text = self.tokenize(text).to(self.device)