import unittest
import numpy as np
from pysr import sympy2torch
import torch
import sympy

class TestTorch(unittest.TestCase):
    def test_sympy2torch(self):
        x, y, z = sympy.symbols('x y z')
        cosx = 1.0 * sympy.cos(x) + y
        X = torch.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()))
        )