Remove unnecessary lambda expression

pysr/sr.py

@@ -38,33 +38,33 @@ sympy_mappings = {
     "sub": lambda x, y: x - y,
     "neg": lambda x: -x,
     "pow": lambda x, y: abs(x) ** y,
-    "cos": lambda x: sympy.cos(x),
-    "sin": lambda x: sympy.sin(x),
-    "tan": lambda x: sympy.tan(x),
-    "cosh": lambda x: sympy.cosh(x),
-    "sinh": lambda x: sympy.sinh(x),
-    "tanh": lambda x: sympy.tanh(x),
-    "exp": lambda x: sympy.exp(x),
-    "acos": lambda x: sympy.acos(x),
-    "asin": lambda x: sympy.asin(x),
-    "atan": lambda x: sympy.atan(x),
+    "cos": sympy.cos,
+    "sin": sympy.sin,
+    "tan": sympy.tan,
+    "cosh": sympy.cosh,
+    "sinh": sympy.sinh,
+    "tanh": sympy.tanh,
+    "exp": sympy.exp,
+    "acos": sympy.acos,
+    "asin": sympy.asin,
+    "atan": sympy.atan,
     "acosh": lambda x: sympy.acosh(abs(x) + 1),
     "acosh_abs": lambda x: sympy.acosh(abs(x) + 1),
-    "asinh": lambda x: sympy.asinh(x),
+    "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),
-    "abs": lambda x: abs(x),
-    "mod": lambda x, y: sympy.Mod(x, y),
-    "erf": lambda x: sympy.erf(x),
-    "erfc": lambda x: sympy.erfc(x),
+    "abs": abs,
+    "mod": sympy.Mod,
+    "erf": sympy.erf,
+    "erfc": sympy.erfc,
     "log_abs": lambda x: sympy.log(abs(x)),
     "log10_abs": lambda x: sympy.log(abs(x), 10),
     "log2_abs": lambda x: sympy.log(abs(x), 2),
     "log1p_abs": lambda x: sympy.log(abs(x) + 1),
-    "floor": lambda x: sympy.floor(x),
-    "ceil": lambda x: sympy.ceil(x),
-    "sign": lambda x: sympy.sign(x),
-    "gamma": lambda x: sympy.gamma(x),
+    "floor": sympy.floor,
+    "ceil": sympy.ceil,
+    "sign": sympy.sign,
+    "gamma": sympy.gamma,
 }