wehub-resource-sync
25 lines
688 B
Python
Executable File
25 lines
688 B
Python
Executable File
import unittest
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import numpy as np
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from prml import nn
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class TestLaplace(unittest.TestCase):
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def test_laplace(self):
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obs = np.arange(3)
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loc = nn.Parameter(0)
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s = nn.Parameter(1)
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for _ in range(1000):
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loc.cleargrad()
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s.cleargrad()
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x = nn.random.Laplace(loc, nn.softplus(s), data=obs)
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x.log_pdf().sum().backward()
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loc.value += loc.grad * 0.01
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s.value += s.grad * 0.01
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self.assertAlmostEqual(x.loc.value, np.median(obs), places=1)
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self.assertAlmostEqual(x.scale.value, np.mean(np.abs(obs - x.loc.value)), places=1)
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if __name__ == '__main__':
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unittest.main()
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