fix: remove padding vectors

similarity.py

@@ -217,6 +217,8 @@ class JinaV4SimilarityMapper:
             truncate_dim=self.num_vectors
         )
         image_embeddings = image_embeddings[0] # [num_patches/num_vectors, embed_dim]
+        non_zero_mask = (image_embeddings.abs().sum(dim=1) > 0)
+        image_embeddings = image_embeddings[non_zero_mask]
 
         # <|im_start|>user\n<|vision_start|><|image_pad|><|vision_end|>Describe the image.<|im_end|>\n
         vision_start_position_from_start = 3 + 1