Bump version with atanh_clip operator

Project.toml

@@ -2,5 +2,5 @@
 SymbolicRegression = "8254be44-1295-4e6a-a16d-46603ac705cb"
 
 [compat]
-SymbolicRegression = "0.5.14"
+SymbolicRegression = "0.5.15"
 julia = "1.5"

docs/operators.md

@@ -32,7 +32,7 @@ of these and other valid operators are stated below.
 `atan`,
 `asinh`,
 `acosh_abs`,
-`atanh`,
+`atanh_clip` (=atanh((x+1)%2 - 1)),
 `erf`,
 `erfc`,
 `gamma`,

pysr/sr.py

@@ -40,8 +40,10 @@ sympy_mappings = {
     'asin': lambda x    : sympy.asin(x),
     'atan': lambda x    : sympy.atan(x),
     'acosh':lambda x    : sympy.acosh(abs(x) + 1),
+    'acosh_abs':lambda x : sympy.acosh(abs(x) + 1),
     'asinh':lambda x    : sympy.asinh(x),
-    'atanh':lambda x    : sympy.atanh(x),
+    '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),
@@ -479,6 +481,8 @@ log_abs=SymbolicRegression.log_abs
 log2_abs=SymbolicRegression.log2_abs
 log10_abs=SymbolicRegression.log10_abs
 log1p_abs=SymbolicRegression.log1p_abs
+acosh_abs=SymbolicRegression.acosh_abs
+atanh_clip=SymbolicRegression.atanh_clip
 sqrt_abs=SymbolicRegression.sqrt_abs
 neg=SymbolicRegression.neg
 greater=SymbolicRegression.greater

setup.py

@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="pysr", # Replace with your own username
-    version="0.5.14",
+    version="0.5.15",
     author="Miles Cranmer",
     author_email="[email protected]",
     description="Simple and efficient symbolic regression",