From abbc5aa03a1273867c8851688c10540492cc0d98 Mon Sep 17 00:00:00 2001
From: ZedongPeng <peng_zedong@126.com>
Date: Mon, 30 Oct 2023 21:33:10 -0400
Subject: [PATCH] fix bug

---
 pyomo/contrib/mindtpy/util.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pyomo/contrib/mindtpy/util.py b/pyomo/contrib/mindtpy/util.py
index 5eb0d18e41d..87972de1d69 100644
--- a/pyomo/contrib/mindtpy/util.py
+++ b/pyomo/contrib/mindtpy/util.py
@@ -23,7 +23,8 @@
     RangeSet,
     ConstraintList,
     TransformationFactory,
-    Expression
+    Expression,
+    log
 )
 from pyomo.repn import generate_standard_repn
 from pyomo.contrib.mcpp.pyomo_mcpp import mcpp_available, McCormick
@@ -1088,7 +1089,7 @@ def compute_determinant(m):
             
         return det_perm
         
-    det_init = pyo.log(compute_determinant(mod)+0.000001)
+    det_init = log(compute_determinant(mod)+0.000001)
 
     mod.my_block.egb.outputs["log_det"].value = det_init