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| """Define utilities to export to sympy""" | |
| from typing import Callable, Dict, List, Optional | |
| import sympy | |
| from sympy import sympify | |
| sympy_mappings = { | |
| "div": lambda x, y: x / y, | |
| "mult": lambda x, y: x * y, | |
| "sqrt": lambda x: sympy.sqrt(x), | |
| "sqrt_abs": lambda x: sympy.sqrt(abs(x)), | |
| "square": lambda x: x**2, | |
| "cube": lambda x: x**3, | |
| "plus": lambda x, y: x + y, | |
| "sub": lambda x, y: x - y, | |
| "neg": lambda x: -x, | |
| "pow": lambda x, y: x**y, | |
| "pow_abs": lambda x, y: abs(x) ** y, | |
| "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(x), | |
| "acosh_abs": lambda x: sympy.acosh(abs(x) + 1), | |
| "asinh": sympy.asinh, | |
| "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, | |
| "erfc": sympy.erfc, | |
| "log": lambda x: sympy.log(x), | |
| "log10": lambda x: sympy.log(x, 10), | |
| "log2": lambda x: sympy.log(x, 2), | |
| "log1p": lambda x: sympy.log(x + 1), | |
| "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": sympy.floor, | |
| "ceil": sympy.ceiling, | |
| "sign": sympy.sign, | |
| "gamma": sympy.gamma, | |
| "round": lambda x: sympy.ceiling(x - 0.5), | |
| "max": lambda x, y: sympy.Piecewise((y, x < y), (x, True)), | |
| "min": lambda x, y: sympy.Piecewise((x, x < y), (y, True)), | |
| "greater": lambda x, y: sympy.Piecewise((1.0, x > y), (0.0, True)), | |
| "cond": lambda x, y: sympy.Piecewise((y, x > 0), (0.0, True)), | |
| "logical_or": lambda x, y: sympy.Piecewise((1.0, (x > 0) | (y > 0)), (0.0, True)), | |
| "logical_and": lambda x, y: sympy.Piecewise((1.0, (x > 0) & (y > 0)), (0.0, True)), | |
| "relu": lambda x: sympy.Piecewise((0.0, x < 0), (x, True)), | |
| } | |
| def create_sympy_symbols_map( | |
| feature_names_in: List[str], | |
| ) -> Dict[str, sympy.Symbol]: | |
| return {variable: sympy.Symbol(variable) for variable in feature_names_in} | |
| def create_sympy_symbols( | |
| feature_names_in: List[str], | |
| ) -> List[sympy.Symbol]: | |
| return [sympy.Symbol(variable) for variable in feature_names_in] | |
| def pysr2sympy( | |
| equation: str, | |
| *, | |
| feature_names_in: Optional[List[str]] = None, | |
| extra_sympy_mappings: Optional[Dict[str, Callable]] = None, | |
| ): | |
| if feature_names_in is None: | |
| feature_names_in = [] | |
| local_sympy_mappings = { | |
| **create_sympy_symbols_map(feature_names_in), | |
| **(extra_sympy_mappings if extra_sympy_mappings is not None else {}), | |
| **sympy_mappings, | |
| } | |
| return sympify(equation, locals=local_sympy_mappings) | |
| def assert_valid_sympy_symbol(var_name: str) -> None: | |
| if var_name in sympy_mappings or var_name in sympy.__dict__.keys(): | |
| raise ValueError(f"Variable name {var_name} is already a function name.") | |