[fix]解决test_model_input中报的找不到move_cache错误

vllm/attention/backends/flash_attn.py

@@ -221,6 +221,16 @@ class FlashAttentionBackend(AttentionBackend):
         value_caches = [kv_cache[1] for kv_cache in kv_caches]
         ops.copy_blocks(key_caches, value_caches, src_to_dists)
 
+    @staticmethod
+    def move_cache(
+        kv_caches: List[torch.Tensor],
+        src_to_dists: torch.Tensor,
+        kv_cache_dtype: str, 
+        num_kv_heads: int, 
+        head_size: int,
+    ) -> None:
+        NotImplementedError
+
 
 @dataclass
 class FlashAttentionMetadata(AttentionMetadata):