From b9b78b1059f68af3994fdb1a88dcbcc889d01f7f Mon Sep 17 00:00:00 2001
From: Angelos Katharopoulos <a_katharopoulos@apple.com>
Date: Thu, 20 Nov 2025 12:15:27 -0800
Subject: [PATCH] Add empty sum_scatter

---
 mlx/distributed/ibv/ibv.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mlx/distributed/ibv/ibv.cpp b/mlx/distributed/ibv/ibv.cpp
index 866147617..84671c694 100644
--- a/mlx/distributed/ibv/ibv.cpp
+++ b/mlx/distributed/ibv/ibv.cpp
@@ -925,6 +925,10 @@ class IBVGroup : public GroupImpl {
     });
   }
 
+  void sum_scatter(const array& input, array& output, Stream stream) override {
+    throw std::runtime_error("[ring] sum_scatter not supported.");
+  }
+
   std::shared_ptr<GroupImpl> split(int color, int key = -1) override {
     throw std::runtime_error("[ibv] Group split not supported.");
   }