From b4ed1fbf294f7922872dd31cebb9b37f3159af62 Mon Sep 17 00:00:00 2001
From: "Chang Liu (Enterprise Products)"
 <9713593+chang-l@users.noreply.github.com>
Date: Mon, 17 Nov 2025 11:30:16 -0800
Subject: [PATCH] Indexer rope fix

Signed-off-by: Chang Liu (Enterprise Products) <9713593+chang-l@users.noreply.github.com>
---
 tensorrt_llm/_torch/attention_backend/sparse/dsa.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tensorrt_llm/_torch/attention_backend/sparse/dsa.py b/tensorrt_llm/_torch/attention_backend/sparse/dsa.py
index 1d447a8557d..04e0e46c7a1 100644
--- a/tensorrt_llm/_torch/attention_backend/sparse/dsa.py
+++ b/tensorrt_llm/_torch/attention_backend/sparse/dsa.py
@@ -723,7 +723,8 @@ def __init__(self,
         self.rotary_emb = RotaryEmbedding(
             pos_embd_params.rope,
             head_dim=self.rope_dim,
-            is_neox=pos_embd_params.is_neox,
+            # RoPE in indexer is not interleaved
+            is_neox=True,
         )
 
         self.softmax_scale = self.head_dim**-0.5