refactor: sympy typing issue

pysr/export_sympy.py

@@ -30,8 +30,8 @@ sympy_mappings = {
     "acosh": lambda x: sympy.acosh(x),
     "acosh_abs": lambda x: sympy.acosh(abs(x) + 1),
     "asinh": sympy.asinh,
-    "atanh": lambda x: sympy.atanh(sympy.Mod(x + 1, 2) - 1),
-    "atanh_clip": lambda x: sympy.atanh(sympy.Mod(x + 1, 2) - 1),
+    "atanh": lambda x: sympy.atanh(sympy.Mod(x + 1, 2) - sympy.S(1)),
+    "atanh_clip": lambda x: sympy.atanh(sympy.Mod(x + 1, 2) - sympy.S(1)),
     "abs": abs,
     "mod": sympy.Mod,
     "erf": sympy.erf,