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tbuckworth avatar tbuckworth commented on June 1, 2024

I updated to pysr==0.18.1, but the problem persists

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MilesCranmer avatar MilesCranmer commented on June 1, 2024

That is weird, it seems like greater is missing its sympy mapping:

PySR/pysr/export_sympy.py

Lines 7 to 57 in 09bfff6

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) - 1),
"atanh_clip": lambda x: sympy.atanh(sympy.Mod(x + 1, 2) - 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)),
"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)),
}

So you could pass this to extra_sympy_mappings of the PySRRegressor, like

extra_sympy_mappings={"greater": lambda x, y: sympy.Piecewise((1.0, x > y), (0.0, True))}

but ideally we should have it built-in since greater is documented as an available operator.

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tbuckworth avatar tbuckworth commented on June 1, 2024

Brilliant! That fixed it, thank you

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