From 70bf7604d153375355a2c168febdd4e0ca0718c1 Mon Sep 17 00:00:00 2001
From: Boris Shapkin <80640421+boryasbora@users.noreply.github.com>
Date: Sat, 29 Aug 2026 00:38:29 +0200
Subject: [PATCH] Fix cg() TypeError with recent CuPy/SciPy: tol renamed to
 rtol

---
 src/implicit_filter/utils/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/implicit_filter/utils/utils.py b/src/implicit_filter/utils/utils.py
index f695a09..0264787 100644
--- a/src/implicit_filter/utils/utils.py
+++ b/src/implicit_filter/utils/utils.py
@@ -60,7 +60,7 @@ def get_backend(backend: str):
             tonumpy = cupy.asnumpy
 
             cg = lambda Smat, ttw, x0, tol, maxiter, pre: cupy_cg(
-                A=Smat, b=ttw, x0=x0, tol=tol, maxiter=maxiter, M=pre
+                A=Smat, b=ttw, x0=x0, rtol=tol, maxiter=maxiter, M=pre
             )
             return csc_matrix, identity, diags, cg, convers, tonumpy