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| import unittest | |
| import numpy as np | |
| import pandas as pd | |
| from pysr import sympy2torch, PySRRegressor | |
| import torch | |
| import sympy | |
| class TestTorch(unittest.TestCase): | |
| def setUp(self): | |
| np.random.seed(0) | |
| def test_sympy2torch(self): | |
| x, y, z = sympy.symbols("x y z") | |
| cosx = 1.0 * sympy.cos(x) + y | |
| X = torch.tensor(np.random.randn(1000, 3)) | |
| true = 1.0 * torch.cos(X[:, 0]) + X[:, 1] | |
| torch_module = sympy2torch(cosx, [x, y, z]) | |
| self.assertTrue( | |
| np.all(np.isclose(torch_module(X).detach().numpy(), true.detach().numpy())) | |
| ) | |
| def test_pipeline(self): | |
| X = np.random.randn(100, 10) | |
| equations = pd.DataFrame( | |
| { | |
| "Equation": ["1.0", "cos(x1)", "square(cos(x1))"], | |
| "MSE": [1.0, 0.1, 1e-5], | |
| "Complexity": [1, 2, 3], | |
| } | |
| ) | |
| equations["Complexity MSE Equation".split(" ")].to_csv( | |
| "equation_file.csv.bkup", sep="|" | |
| ) | |
| model = PySRRegressor( | |
| model_selection="accuracy", | |
| equation_file="equation_file.csv", | |
| variables_names="x1 x2 x3".split(" "), | |
| extra_sympy_mappings={}, | |
| output_torch_format=True, | |
| multioutput=False, | |
| nout=1, | |
| selection=[1, 2, 3], | |
| ) | |
| model.n_features = 2 # TODO: Why is this 2 and not 3? | |
| model.using_pandas = False | |
| model.refresh() | |
| tformat = model.pytorch() | |
| self.assertEqual(str(tformat), "_SingleSymPyModule(expression=cos(x1)**2)") | |
| np.testing.assert_almost_equal( | |
| tformat(torch.tensor(X)).detach().numpy(), | |
| np.square(np.cos(X[:, 1])), # Selection 1st feature | |
| decimal=4, | |
| ) | |
| def test_mod_mapping(self): | |
| x, y, z = sympy.symbols("x y z") | |
| expression = x ** 2 + sympy.atanh(sympy.Mod(y + 1, 2) - 1) * 3.2 * z | |
| module = sympy2torch(expression, [x, y, z]) | |
| X = torch.rand(100, 3).float() * 10 | |
| true_out = ( | |
| X[:, 0] ** 2 + torch.atanh(torch.fmod(X[:, 1] + 1, 2) - 1) * 3.2 * X[:, 2] | |
| ) | |
| torch_out = module(X) | |
| np.testing.assert_array_almost_equal( | |
| true_out.detach(), torch_out.detach(), decimal=4 | |
| ) | |
| def test_custom_operator(self): | |
| X = np.random.randn(100, 3) | |
| equations = pd.DataFrame( | |
| { | |
| "Equation": ["1.0", "mycustomoperator(x0)"], | |
| "MSE": [1.0, 0.1], | |
| "Complexity": [1, 2], | |
| } | |
| ) | |
| equations["Complexity MSE Equation".split(" ")].to_csv( | |
| "equation_file_custom_operator.csv.bkup", sep="|" | |
| ) | |
| model = PySRRegressor( | |
| model_selection="accuracy", | |
| equation_file="equation_file_custom_operator.csv", | |
| variables_names="x1 x2 x3".split(" "), | |
| extra_sympy_mappings={"mycustomoperator": sympy.sin}, | |
| extra_torch_mappings={"mycustomoperator": torch.sin}, | |
| output_torch_format=True, | |
| multioutput=False, | |
| nout=1, | |
| selection=[0, 1, 2], | |
| ) | |
| model.n_features = 3 | |
| model.using_pandas = False | |
| model.refresh() | |
| # Will automatically use the set global state from get_hof. | |
| tformat = model.pytorch() | |
| self.assertEqual(str(tformat), "_SingleSymPyModule(expression=sin(x0))") | |
| np.testing.assert_almost_equal( | |
| tformat(torch.tensor(X)).detach().numpy(), | |
| np.sin(X[:, 0]), # Selection 1st feature | |
| decimal=4, | |
| ) | |