From 63c299c5d61c342af3511bb96381c812e5e3edc3 Mon Sep 17 00:00:00 2001
From: gasoonjia <gasoonjia@icloud.com>
Date: Fri, 10 Oct 2025 00:13:53 -0700
Subject: [PATCH] set emulate_precision_casts as true for cuda backend for
 better accuracy

as title

Differential Revision: [D84288174](https://our.internmc.facebook.com/intern/diff/D84288174/)

[ghstack-poisoned]
---
 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