diff --git a/src/sfast/libs/xformers/xformers_attention.py b/src/sfast/libs/xformers/xformers_attention.py
index f4942d2..deb4ba9 100644
--- a/src/sfast/libs/xformers/xformers_attention.py
+++ b/src/sfast/libs/xformers/xformers_attention.py
@@ -4,17 +4,21 @@
 from xformers import ops
 from sfast.utils.custom_python_operator import register_custom_python_operator
 
-OP_STR_MAP = {
-    ops.MemoryEfficientAttentionCutlassFwdFlashBwOp:
+OP_STR_MAP = {}
+
+for attr_name in [
     'MemoryEfficientAttentionCutlassFwdFlashBwOp',
-    ops.MemoryEfficientAttentionCutlassOp: 'MemoryEfficientAttentionCutlassOp',
-    ops.MemoryEfficientAttentionFlashAttentionOp:
+    'MemoryEfficientAttentionCutlassOp',
     'MemoryEfficientAttentionFlashAttentionOp',
-    ops.MemoryEfficientAttentionOp: 'MemoryEfficientAttentionOp',
-    ops.MemoryEfficientAttentionTritonFwdFlashBwOp:
+    'MemoryEfficientAttentionOp',
     'MemoryEfficientAttentionTritonFwdFlashBwOp',
-    ops.TritonFlashAttentionOp: 'TritonFlashAttentionOp',
-}
+    'TritonFlashAttentionOp',
+    'MemoryEfficientAttentionCkOp',
+    'MemoryEfficientAttentionSplitKCkOp'
+]:
+    op_attr = getattr(ops, attr_name, None)
+    if op_attr is not None:
+        OP_STR_MAP[op_attr] = attr_name
 
 STR_OP_MAP = {v: k for k, v in OP_STR_MAP.items()}