From e9f205283f1f60ef57b152f5e355df70ed71084f Mon Sep 17 00:00:00 2001
From: Songhao Jia <gasoonjia@meta.com>
Date: Thu, 9 Oct 2025 20:39:40 -0700
Subject: [PATCH] set emulate_precision_casts as true for cuda backend for
 better accuracy (#14961)

Summary:

as title

Reviewed By: larryliu0820, yushangdi

Differential Revision: D84288174
---
 backends/cuda/cuda_backend.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/backends/cuda/cuda_backend.py b/backends/cuda/cuda_backend.py
index 8ed8cdefbb1..ef98de29f23 100644
--- a/backends/cuda/cuda_backend.py
+++ b/backends/cuda/cuda_backend.py
@@ -129,6 +129,8 @@ def preprocess(
                 user_input_placeholders.append(node.meta["val"])
 
         options: dict[str, typing.Any] = {
+            # Better model precision
+            "emulate_precision_casts": True,
             # Embed CUDA kernel binaries directly into the compiled shared object
             "aot_inductor.embed_kernel_binary": True,
             # Do not link against the full PyTorch/libtorch library