diff --git a/chunk_codegen.py b/chunk_codegen.py
index b5bb8f185..79cefddf0 100644
--- a/chunk_codegen.py
+++ b/chunk_codegen.py
@@ -56,6 +56,14 @@ def _is_non_compute_node_except_placeholder(node):
     return False
 
 
+def _is_non_compute_node_except_placeholder_output(node):
+    if any(i in node.op for i in ["get_attr"]) or any(
+        i in node.name for i in ["getitem", "getattr"]
+    ):
+        return True
+    return False
+
+
 class FlowTracer(object):
     def __init__(self, gm) -> None:
         self.gm = gm
@@ -1083,13 +1091,14 @@ class MemoryEstimator(object):
             i is not None for i in [start_nodes, end_nodes, chunk_dims, chunk_sizes]
         )
         chunk_within = False
-        chunk_region_idx = 0
+        chunk_region_idx = None
         chunk_ratio = 1  # use it to estimate chunk mem
 
         for idx, node in enumerate(node_list):
             # if node in chunk start nodes, change chunk ratio and add chunk_tensor
             if use_chunk and idx in start_nodes:
                 chunk_within = True
+                chunk_region_idx = start_nodes.index(idx)
                 chunk_ratio = self._get_chunk_ratio(
                     node, chunk_dims[chunk_region_idx], chunk_sizes[chunk_region_idx]
                 )
@@ -1149,7 +1158,7 @@ class MemoryEstimator(object):
                 )
                 chunk_within = False
                 chunk_ratio = 1
-                chunk_region_idx += 1
+                chunk_region_idx = None
 
             act_memory_after_node_log.append(act_memory)
             active_node_list_log.append(copy.deepcopy(active_node_list))
@@ -1467,7 +1476,7 @@ def _find_chunk_compute_input_and_output_nodes(nodes: List[Node]):
             if (
                 output_node not in nodes
                 and node not in output_nodes
-                and not _is_non_compute_node_except_placeholder(output_node)
+                and not _is_non_compute_node_except_placeholder_output(output_node)
             ):
                 output_nodes.append(node)