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test_distributions.py
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"""
Note [Randomized statistical tests]
-----------------------------------
This note describes how to maintain tests in this file as random sources
change. This file contains two types of randomized tests:
1. The easier type of randomized test are tests that should always pass but are
initialized with random data. If these fail something is wrong, but it's
fine to use a fixed seed by inheriting from common.TestCase.
2. The trickier tests are statistical tests. These tests explicitly call
set_rng_seed(n) and are marked "see Note [Randomized statistical tests]".
These statistical tests have a known positive failure rate
(we set failure_rate=1e-3 by default). We need to balance strength of these
tests with annoyance of false alarms. One way that works is to specifically
set seeds in each of the randomized tests. When a random generator
occasionally changes (as in #4312 vectorizing the Box-Muller sampler), some
of these statistical tests may (rarely) fail. If one fails in this case,
it's fine to increment the seed of the failing test (but you shouldn't need
to increment it more than once; otherwise something is probably actually
wrong).
"""
import math
import numbers
import unittest
from collections import namedtuple
from itertools import product
from random import shuffle
import torch
from common import TestCase, run_tests, set_rng_seed
from torch.autograd import Variable, grad, gradcheck, variable
from torch.distributions import (Bernoulli, Beta, Binomial, Categorical,
Cauchy, Chi2, Dirichlet, Distribution,
Exponential, ExponentialFamily,
FisherSnedecor, Gamma, Geometric,
Gumbel, Laplace, LogNormal, LogisticNormal,
Multinomial, MultivariateNormal, Normal,
OneHotCategorical, Pareto, Poisson,
RelaxedBernoulli, RelaxedOneHotCategorical,
StudentT, TransformedDistribution, Uniform,
constraints, kl_divergence)
from torch.distributions.constraint_registry import biject_to, transform_to
from torch.distributions.constraints import Constraint, is_dependent
from torch.distributions.dirichlet import _Dirichlet_backward
from torch.distributions.kl import _kl_expfamily_expfamily
from torch.distributions.transforms import (AbsTransform, AffineTransform,
ComposeTransform, ExpTransform,
LowerCholeskyTransform,
PowerTransform,
SigmoidTransform, SoftmaxTransform,
StickBreakingTransform,
identity_transform)
from torch.distributions.utils import _finfo, probs_to_logits, softmax
TEST_NUMPY = True
try:
import numpy as np
import scipy.stats
import scipy.special
except ImportError:
TEST_NUMPY = False
TEST_CUDA = torch.cuda.is_available()
def pairwise(Dist, *params):
"""
Creates a pair of distributions `Dist` initialzed to test each element of
param with each other.
"""
params1 = [torch.tensor([p] * len(p)) for p in params]
params2 = [p.transpose(0, 1) for p in params1]
return Dist(*params1), Dist(*params2)
def is_all_nan(tensor):
"""
Checks if all entries of a tensor is nan.
"""
return (tensor != tensor).all()
# Register all distributions for generic tests.
Example = namedtuple('Example', ['Dist', 'params'])
EXAMPLES = [
Example(Bernoulli, [
{'probs': variable([0.7, 0.2, 0.4], requires_grad=True)},
{'probs': variable([0.3], requires_grad=True)},
{'probs': 0.3},
]),
Example(Geometric, [
{'probs': variable([0.7, 0.2, 0.4], requires_grad=True)},
{'probs': variable([0.3], requires_grad=True)},
{'probs': 0.3},
]),
Example(Beta, [
{
'concentration1': variable(torch.exp(torch.randn(2, 3)), requires_grad=True),
'concentration0': variable(torch.exp(torch.randn(2, 3)), requires_grad=True),
},
{
'concentration1': variable(torch.exp(torch.randn(4)), requires_grad=True),
'concentration0': variable(torch.exp(torch.randn(4)), requires_grad=True),
},
]),
Example(Categorical, [
{'probs': variable([[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True)},
{'probs': variable([[1.0, 0.0], [0.0, 1.0]], requires_grad=True)},
]),
Example(Binomial, [
{'probs': variable([[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True), 'total_count': 10},
{'probs': variable([[1.0, 0.0], [0.0, 1.0]], requires_grad=True), 'total_count': 10},
]),
Example(Multinomial, [
{'probs': variable([[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True), 'total_count': 10},
{'probs': variable([[1.0, 0.0], [0.0, 1.0]], requires_grad=True), 'total_count': 10},
]),
Example(Cauchy, [
{'loc': 0.0, 'scale': 1.0},
{'loc': variable([0.0]), 'scale': 1.0},
{'loc': variable([[0.0], [0.0]]),
'scale': variable([[1.0], [1.0]])}
]),
Example(Chi2, [
{'df': variable(torch.exp(torch.randn(2, 3)), requires_grad=True)},
{'df': variable(torch.exp(torch.randn(1)), requires_grad=True)},
]),
Example(StudentT, [
{'df': variable(torch.exp(torch.randn(2, 3)), requires_grad=True)},
{'df': variable(torch.exp(torch.randn(1)), requires_grad=True)},
]),
Example(Dirichlet, [
{'concentration': variable(torch.exp(torch.randn(2, 3)), requires_grad=True)},
{'concentration': variable(torch.exp(torch.randn(4)), requires_grad=True)},
]),
Example(Exponential, [
{'rate': variable(torch.randn(5, 5).abs(), requires_grad=True)},
{'rate': variable(torch.randn(1).abs(), requires_grad=True)},
]),
Example(FisherSnedecor, [
{
'df1': variable(torch.randn(5, 5).abs(), requires_grad=True),
'df2': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'df1': variable(torch.randn(1).abs(), requires_grad=True),
'df2': variable(torch.randn(1).abs(), requires_grad=True),
},
{
'df1': variable([1.0]),
'df2': 1.0,
}
]),
Example(Gamma, [
{
'concentration': variable(torch.exp(torch.randn(2, 3)), requires_grad=True),
'rate': variable(torch.exp(torch.randn(2, 3)), requires_grad=True),
},
{
'concentration': variable(torch.exp(torch.randn(1)), requires_grad=True),
'rate': variable(torch.exp(torch.randn(1)), requires_grad=True),
},
]),
Example(Gumbel, [
{
'loc': torch.randn(5, 5, requires_grad=True),
'scale': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'loc': torch.randn(1, requires_grad=True),
'scale': variable(torch.randn(1).abs(), requires_grad=True),
},
]),
Example(Laplace, [
{
'loc': torch.randn(5, 5, requires_grad=True),
'scale': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'loc': torch.randn(1, requires_grad=True),
'scale': variable(torch.randn(1).abs(), requires_grad=True),
},
{
'loc': variable([1.0, 0.0], requires_grad=True),
'scale': variable([1e-5, 1e-5], requires_grad=True),
},
]),
Example(LogNormal, [
{
'loc': torch.randn(5, 5, requires_grad=True),
'scale': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'loc': torch.randn(1, requires_grad=True),
'scale': variable(torch.randn(1).abs(), requires_grad=True),
},
{
'loc': variable([1.0, 0.0], requires_grad=True),
'scale': variable([1e-5, 1e-5], requires_grad=True),
},
]),
Example(LogisticNormal, [
{
'loc': Variable(torch.randn(5, 5), requires_grad=True),
'scale': Variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'loc': Variable(torch.randn(1), requires_grad=True),
'scale': Variable(torch.randn(1).abs(), requires_grad=True),
},
{
'loc': Variable(torch.Tensor([1.0, 0.0]), requires_grad=True),
'scale': Variable(torch.Tensor([1e-5, 1e-5]), requires_grad=True),
},
]),
Example(MultivariateNormal, [
{
'loc': torch.randn(5, 2, requires_grad=True),
'covariance_matrix': variable(torch.Tensor([[2.0, 0.3], [0.3, 0.25]]), requires_grad=True),
},
{
'loc': torch.randn(2, 3, requires_grad=True),
'precision_matrix': variable(torch.Tensor([[2.0, 0.1, 0.0],
[0.1, 0.25, 0.0],
[0.0, 0.0, 0.3]]), requires_grad=True),
},
{
'loc': torch.randn(5, 3, 2, requires_grad=True),
'scale_tril': variable(torch.Tensor([[[2.0, 0.0], [-0.5, 0.25]],
[[2.0, 0.0], [0.3, 0.25]],
[[5.0, 0.0], [-0.5, 1.5]]]), requires_grad=True),
},
{
'loc': variable(torch.Tensor([1.0, -1.0])),
'covariance_matrix': variable(torch.Tensor([[5.0, -0.5], [-0.5, 1.5]])),
},
]),
Example(Normal, [
{
'loc': torch.randn(5, 5, requires_grad=True),
'scale': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'loc': torch.randn(1, requires_grad=True),
'scale': variable(torch.randn(1).abs(), requires_grad=True),
},
{
'loc': variable([1.0, 0.0], requires_grad=True),
'scale': variable([1e-5, 1e-5], requires_grad=True),
},
]),
Example(OneHotCategorical, [
{'probs': variable([[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True)},
{'probs': variable([[1.0, 0.0], [0.0, 1.0]], requires_grad=True)},
]),
Example(Pareto, [
{
'scale': 1.0,
'alpha': 1.0
},
{
'scale': variable(torch.randn(5, 5).abs(), requires_grad=True),
'alpha': variable(torch.randn(5, 5).abs(), requires_grad=True)
},
{
'scale': variable([1.0]),
'alpha': 1.0
}
]),
Example(Poisson, [
{
'rate': variable(torch.randn(5, 5).abs(), requires_grad=True),
},
{
'rate': variable(torch.randn(3).abs(), requires_grad=True),
},
{
'rate': 0.2,
}
]),
Example(RelaxedBernoulli, [
{
'temperature': variable([0.5], requires_grad=True),
'probs': variable([0.7, 0.2, 0.4], requires_grad=True),
},
{
'temperature': variable([2.0]),
'probs': variable([0.3]),
},
{
'temperature': variable([7.2]),
'logits': variable([-2.0, 2.0, 1.0, 5.0])
}
]),
Example(RelaxedOneHotCategorical, [
{
'temperature': variable([0.5], requires_grad=True),
'probs': variable([[0.1, 0.2, 0.7], [0.5, 0.3, 0.2]], requires_grad=True)
},
{
'temperature': variable([2.0]),
'probs': variable([[1.0, 0.0], [0.0, 1.0]])
},
{
'temperature': variable([7.2]),
'logits': variable([[-2.0, 2.0], [1.0, 5.0]])
}
]),
Example(TransformedDistribution, [
{
'base_distribution': Normal(torch.randn(2, 3, requires_grad=True),
variable(torch.randn(2, 3).abs(), requires_grad=True)),
'transforms': [],
},
{
'base_distribution': Normal(torch.randn(2, 3, requires_grad=True),
variable(torch.randn(2, 3).abs(), requires_grad=True)),
'transforms': ExpTransform(),
},
{
'base_distribution': Normal(torch.randn(2, 3, 5, requires_grad=True),
variable(torch.randn(2, 3, 5).abs(), requires_grad=True)),
'transforms': [AffineTransform(torch.randn(3, 5), torch.randn(3, 5)),
ExpTransform()],
},
{
'base_distribution': Normal(torch.randn(2, 3, 5, requires_grad=True),
variable(torch.randn(2, 3, 5).abs(), requires_grad=True)),
'transforms': AffineTransform(1, 2),
},
]),
Example(Uniform, [
{
'low': torch.zeros(5, 5, requires_grad=True),
'high': torch.ones(5, 5, requires_grad=True),
},
{
'low': torch.zeros(1, requires_grad=True),
'high': torch.ones(1, requires_grad=True),
},
{
'low': variable([1.0, 1.0], requires_grad=True),
'high': variable([2.0, 3.0], requires_grad=True),
},
]),
]
BAD_EXAMPLES = [
Example(Bernoulli, [
{'probs': variable([1.1, 0.2, 0.4], requires_grad=True)},
{'probs': variable([-0.5], requires_grad=True)},
{'probs': 1.00001},
]),
Example(Beta, [
{
'concentration1': variable([0.0], requires_grad=True),
'concentration0': variable([0.0], requires_grad=True),
},
{
'concentration1': variable([-1.0], requires_grad=True),
'concentration0': variable([-2.0], requires_grad=True),
},
]),
Example(Geometric, [
{'probs': variable([1.1, 0.2, 0.4], requires_grad=True)},
{'probs': variable([-0.3], requires_grad=True)},
{'probs': 1.00000001},
]),
Example(Categorical, [
{'probs': variable([[-0.1, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True)},
{'probs': variable([[-1.0, 10.0], [0.0, -1.0]], requires_grad=True)},
]),
Example(Binomial, [
{'probs': variable([[-0.0000001, 0.2, 0.3], [0.5, 0.3, 0.2]], requires_grad=True),
'total_count': 10},
{'probs': variable([[1.0, 0.0], [0.0, 2.0]], requires_grad=True),
'total_count': 10},
]),
Example(Cauchy, [
{'loc': 0.0, 'scale': -1.0},
{'loc': variable([0.0]), 'scale': 0.0},
{'loc': variable([[0.0], [-2.0]]),
'scale': variable([[-0.000001], [1.0]])}
]),
Example(Chi2, [
{'df': variable([0.], requires_grad=True)},
{'df': variable([-2.], requires_grad=True)},
]),
Example(StudentT, [
{'df': variable([0.], requires_grad=True)},
{'df': variable([-2.], requires_grad=True)},
]),
Example(Dirichlet, [
{'concentration': variable([0.], requires_grad=True)},
{'concentration': variable([-2.], requires_grad=True)}
]),
Example(Exponential, [
{'rate': variable([0., 0.], requires_grad=True)},
{'rate': variable([-2.], requires_grad=True)}
]),
Example(FisherSnedecor, [
{
'df1': variable([0., 0.], requires_grad=True),
'df2': variable([-1., -100.], requires_grad=True),
},
{
'df1': variable([1., 1.], requires_grad=True),
'df2': variable([0., 0.], requires_grad=True),
}
]),
Example(Gamma, [
{
'concentration': variable([0., 0.], requires_grad=True),
'rate': variable([-1., -100.], requires_grad=True),
},
{
'concentration': variable([1., 1.], requires_grad=True),
'rate': variable([0., 0.], requires_grad=True),
}
]),
Example(Gumbel, [
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([0., 1.], requires_grad=True),
},
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([1., -1.], requires_grad=True),
},
]),
Example(Laplace, [
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([0., 1.], requires_grad=True),
},
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([1., -1.], requires_grad=True),
},
]),
Example(LogNormal, [
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([0., 1.], requires_grad=True),
},
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([1., -1.], requires_grad=True),
},
]),
Example(Normal, [
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([0., 1.], requires_grad=True),
},
{
'loc': variable([1., 1.], requires_grad=True),
'scale': variable([1., -1.], requires_grad=True),
},
{
'loc': variable([1.0, 0.0], requires_grad=True),
'scale': variable([1e-5, -1e-5], requires_grad=True),
},
]),
Example(OneHotCategorical, [
{'probs': variable([[0.1, 0.2, 0.3], [0.1, -10.0, 0.2]], requires_grad=True)},
{'probs': variable([[0.0, 0.0], [0.0, 0.0]], requires_grad=True)},
]),
Example(Pareto, [
{
'scale': 0.0,
'alpha': 0.0
},
{
'scale': variable([0.0, 0.0], requires_grad=True),
'alpha': variable([-1e-5, 0.0], requires_grad=True)
},
{
'scale': variable([1.0]),
'alpha': -1.0
}
]),
Example(Poisson, [
{
'rate': variable([0.0], requires_grad=True),
},
{
'rate': -1.0,
}
]),
Example(RelaxedBernoulli, [
{
'temperature': variable([1.5], requires_grad=True),
'probs': variable([1.7, 0.2, 0.4], requires_grad=True),
},
{
'temperature': variable([2.0]),
'probs': variable([-1.0]),
}
]),
Example(RelaxedOneHotCategorical, [
{
'temperature': variable([0.5], requires_grad=True),
'probs': variable([[-0.1, 0.2, 0.7], [0.5, 0.3, 0.2]], requires_grad=True)
},
{
'temperature': variable([2.0]),
'probs': variable([[-1.0, 0.0], [-1.0, 1.1]])
}
]),
Example(TransformedDistribution, [
{
'base_distribution': Normal(0, 1),
'transforms': lambda x: x,
},
{
'base_distribution': Normal(0, 1),
'transforms': [lambda x: x],
},
]),
Example(Uniform, [
{
'low': variable([2.0], requires_grad=True),
'high': variable([2.0], requires_grad=True),
},
{
'low': variable([0.0], requires_grad=True),
'high': variable([0.0], requires_grad=True),
},
{
'low': variable([1.0], requires_grad=True),
'high': variable([0.0], requires_grad=True),
}
])
]
def unwrap(value):
if isinstance(value, Variable):
return value.data
return value
class TestDistributions(TestCase):
def _gradcheck_log_prob(self, dist_ctor, ctor_params):
# performs gradient checks on log_prob
distribution = dist_ctor(*ctor_params)
s = distribution.sample()
expected_shape = distribution.batch_shape + distribution.event_shape
self.assertEqual(s.size(), expected_shape)
def apply_fn(*params):
return dist_ctor(*params).log_prob(s)
gradcheck(apply_fn, ctor_params, raise_exception=True)
def _check_log_prob(self, dist, asset_fn):
# checks that the log_prob matches a reference function
s = dist.sample()
log_probs = dist.log_prob(s)
log_probs_data_flat = log_probs.data.view(-1)
s_data_flat = s.data.view(len(log_probs_data_flat), -1)
for i, (val, log_prob) in enumerate(zip(s_data_flat, log_probs_data_flat)):
asset_fn(i, val.squeeze(), log_prob)
def _check_sampler_sampler(self, torch_dist, ref_dist, message, multivariate=False,
num_samples=10000, failure_rate=1e-3):
# Checks that the .sample() method matches a reference function.
torch_samples = torch_dist.sample((num_samples,)).squeeze()
if isinstance(torch_samples, Variable):
torch_samples = torch_samples.data
torch_samples = torch_samples.cpu().numpy()
ref_samples = ref_dist.rvs(num_samples).astype(np.float64)
if multivariate:
# Project onto a random axis.
axis = np.random.normal(size=torch_samples.shape[-1])
axis /= np.linalg.norm(axis)
torch_samples = np.dot(torch_samples, axis)
ref_samples = np.dot(ref_samples, axis)
samples = [(x, +1) for x in torch_samples] + [(x, -1) for x in ref_samples]
shuffle(samples) # necessary to prevent stable sort from making uneven bins for discrete
samples.sort(key=lambda x: x[0])
samples = np.array(samples)[:, 1]
# Aggragate into bins filled with roughly zero-mean unit-variance RVs.
num_bins = 10
samples_per_bin = len(samples) // num_bins
bins = samples.reshape((num_bins, samples_per_bin)).mean(axis=1)
stddev = samples_per_bin ** -0.5
threshold = stddev * scipy.special.erfinv(1 - 2 * failure_rate / num_bins)
message = '{}.sample() is biased:\n{}'.format(message, bins)
for bias in bins:
self.assertLess(-threshold, bias, message)
self.assertLess(bias, threshold, message)
@unittest.skipIf(not TEST_NUMPY, "NumPy not found")
def _check_sampler_discrete(self, torch_dist, ref_dist, message,
num_samples=10000, failure_rate=1e-3):
"""Runs a Chi2-test for the support, but ignores tail instead of combining"""
torch_samples = torch_dist.sample((num_samples,)).squeeze()
if isinstance(torch_samples, Variable):
torch_samples = torch_samples.data
torch_samples = torch_samples.cpu().numpy()
unique, counts = np.unique(torch_samples, return_counts=True)
pmf = ref_dist.pmf(unique)
msk = (counts > 5) & ((pmf * num_samples) > 5)
self.assertGreater(pmf[msk].sum(), 0.9, "Distribution is too sparse for test; try increasing num_samples")
chisq, p = scipy.stats.chisquare(counts[msk], pmf[msk] * num_samples)
self.assertGreater(p, failure_rate, message)
def _check_enumerate_support(self, dist, examples):
for param, expected in examples:
param = torch.Tensor(param)
expected = torch.Tensor(expected)
actual = dist(param).enumerate_support()
self.assertEqual(actual, expected)
param = variable(param)
expected = variable(expected)
actual = dist(param).enumerate_support()
self.assertEqual(actual, expected)
def test_sample_detached(self):
for Dist, params in EXAMPLES:
for i, param in enumerate(params):
variable_params = [p for p in param.values() if getattr(p, 'requires_grad', False)]
if not variable_params:
continue
dist = Dist(**param)
sample = dist.sample()
self.assertFalse(sample.requires_grad,
msg='{} example {}/{}, .sample() is not detached'.format(
Dist.__name__, i + 1, len(params)))
def test_rsample_requires_grad(self):
for Dist, params in EXAMPLES:
for i, param in enumerate(params):
if not any(getattr(p, 'requires_grad', False) for p in param.values()):
continue
dist = Dist(**param)
if not dist.has_rsample:
continue
sample = dist.rsample()
self.assertTrue(sample.requires_grad,
msg='{} example {}/{}, .rsample() does not require grad'.format(
Dist.__name__, i + 1, len(params)))
def test_enumerate_support_type(self):
for Dist, params in EXAMPLES:
for i, param in enumerate(params):
dist = Dist(**param)
try:
self.assertTrue(type(unwrap(dist.sample())) is type(unwrap(dist.enumerate_support())),
msg=('{} example {}/{}, return type mismatch between ' +
'sample and enumerate_support.').format(Dist.__name__, i + 1, len(params)))
except NotImplementedError:
pass
def test_has_examples(self):
distributions_with_examples = set(e.Dist for e in EXAMPLES)
for Dist in globals().values():
if isinstance(Dist, type) and issubclass(Dist, Distribution) \
and Dist is not Distribution and Dist is not ExponentialFamily:
self.assertIn(Dist, distributions_with_examples,
"Please add {} to the EXAMPLES list in test_distributions.py".format(Dist.__name__))
def test_bernoulli(self):
p = torch.tensor([0.7, 0.2, 0.4], requires_grad=True)
r = torch.tensor(0.3, requires_grad=True)
s = 0.3
self.assertEqual(Bernoulli(p).sample((8,)).size(), (8, 3))
self.assertTrue(isinstance(Bernoulli(p).sample().data, torch.Tensor))
self.assertEqual(Bernoulli(r).sample((8,)).size(), (8,))
self.assertEqual(Bernoulli(r).sample().size(), ())
self.assertEqual(Bernoulli(r).sample((3, 2)).size(), (3, 2,))
self.assertEqual(Bernoulli(s).sample().size(), ())
self._gradcheck_log_prob(Bernoulli, (p,))
def ref_log_prob(idx, val, log_prob):
prob = p.data[idx]
self.assertEqual(log_prob, math.log(prob if val else 1 - prob))
self._check_log_prob(Bernoulli(p), ref_log_prob)
self._check_log_prob(Bernoulli(logits=p.log() - (-p).log1p()), ref_log_prob)
self.assertRaises(NotImplementedError, Bernoulli(r).rsample)
# check entropy computation
self.assertEqual(Bernoulli(p).entropy().data, torch.Tensor([0.6108, 0.5004, 0.6730]), prec=1e-4)
self.assertEqual(Bernoulli(torch.Tensor([0.0])).entropy(), torch.Tensor([0.0]))
self.assertEqual(Bernoulli(s).entropy(), torch.tensor(0.6108), prec=1e-4)
def test_bernoulli_enumerate_support(self):
examples = [
([0.1], [[0], [1]]),
([0.1, 0.9], [[0, 0], [1, 1]]),
([[0.1, 0.2], [0.3, 0.4]], [[[0, 0], [0, 0]], [[1, 1], [1, 1]]]),
]
self._check_enumerate_support(Bernoulli, examples)
def test_bernoulli_3d(self):
p = variable(torch.Tensor(2, 3, 5).fill_(0.5), requires_grad=True)
self.assertEqual(Bernoulli(p).sample().size(), (2, 3, 5))
self.assertEqual(Bernoulli(p).sample(sample_shape=(2, 5)).size(),
(2, 5, 2, 3, 5))
self.assertEqual(Bernoulli(p).sample((2,)).size(), (2, 2, 3, 5))
def test_geometric(self):
p = variable([0.7, 0.2, 0.4], requires_grad=True)
r = variable(0.3, requires_grad=True)
s = 0.3
self.assertEqual(Geometric(p).sample((8,)).size(), (8, 3))
self.assertEqual(Geometric(1).sample(), 0)
self.assertEqual(Geometric(1).log_prob(torch.tensor(1.)), -float('inf'), allow_inf=True)
self.assertEqual(Geometric(1).log_prob(torch.tensor(0.)), 0)
self.assertTrue(isinstance(Geometric(p).sample().data, torch.Tensor))
self.assertEqual(Geometric(r).sample((8,)).size(), (8,))
self.assertEqual(Geometric(r).sample().size(), ())
self.assertEqual(Geometric(r).sample((3, 2)).size(), (3, 2))
self.assertEqual(Geometric(s).sample().size(), ())
self._gradcheck_log_prob(Geometric, (p,))
self.assertRaises(ValueError, lambda: Geometric(0))
self.assertRaises(NotImplementedError, Geometric(r).rsample)
@unittest.skipIf(not TEST_NUMPY, "NumPy not found")
def test_geometric_log_prob_and_entropy(self):
p = variable([0.7, 0.2, 0.4], requires_grad=True)
s = 0.3
def ref_log_prob(idx, val, log_prob):
prob = p.data[idx]
self.assertEqual(log_prob, scipy.stats.geom(prob, loc=-1).logpmf(val))
self._check_log_prob(Geometric(p), ref_log_prob)
self._check_log_prob(Geometric(logits=p.log() - (-p).log1p()), ref_log_prob)
# check entropy computation
self.assertEqual(Geometric(p).entropy().data, scipy.stats.geom(p.data.numpy(), loc=-1).entropy(), prec=1e-3)
self.assertEqual(float(Geometric(s).entropy()), scipy.stats.geom(s, loc=-1).entropy().item(), prec=1e-3)
@unittest.skipIf(not TEST_NUMPY, "NumPy not found")
def test_geometric_sample(self):
set_rng_seed(0) # see Note [Randomized statistical tests]
for prob in [0.01, 0.18, 0.8]:
self._check_sampler_discrete(Geometric(prob),
scipy.stats.geom(p=prob, loc=-1),
'Geometric(prob={})'.format(prob))
def test_binomial(self):
p = variable(torch.arange(0.05, 1, 0.1), requires_grad=True)
for total_count in [1, 2, 10]:
self._gradcheck_log_prob(lambda p: Binomial(total_count, p), [p])
self._gradcheck_log_prob(lambda p: Binomial(total_count, None, p.log()), [p])
self.assertRaises(NotImplementedError, Binomial(10, p).rsample)
self.assertRaises(NotImplementedError, Binomial(10, p).entropy)
@unittest.skipIf(not TEST_NUMPY, "NumPy not found")
def test_binomial_log_prob(self):
probs = variable(torch.arange(0.05, 1, 0.1))
for total_count in [1, 2, 10]:
def ref_log_prob(idx, x, log_prob):
p = probs.data.view(-1)[idx].item()
expected = scipy.stats.binom(total_count, p).logpmf(x)
self.assertAlmostEqual(log_prob, expected, places=3)
self._check_log_prob(Binomial(total_count, probs), ref_log_prob)
logits = probs_to_logits(probs, is_binary=True)
self._check_log_prob(Binomial(total_count, logits=logits), ref_log_prob)
def test_binomial_extreme_vals(self):
total_count = 100
bin0 = Binomial(total_count, 0)
self.assertEqual(bin0.sample(), 0)
self.assertAlmostEqual(bin0.log_prob(torch.tensor([0.]))[0], 0, places=3)
self.assertEqual(float(bin0.log_prob(torch.tensor([1.])).exp()), 0, allow_inf=True)
bin1 = Binomial(total_count, 1)
self.assertEqual(bin1.sample(), total_count)
self.assertAlmostEqual(bin1.log_prob(torch.tensor([float(total_count)]))[0], 0, places=3)
self.assertEqual(float(bin1.log_prob(torch.tensor([float(total_count - 1)])).exp()), 0, allow_inf=True)
def test_multinomial_1d(self):
total_count = 10
p = variable([0.1, 0.2, 0.3], requires_grad=True)
self.assertEqual(Multinomial(total_count, p).sample().size(), (3,))
self.assertEqual(Multinomial(total_count, p).sample((2, 2)).size(), (2, 2, 3))
self.assertEqual(Multinomial(total_count, p).sample((1,)).size(), (1, 3))
self._gradcheck_log_prob(lambda p: Multinomial(total_count, p), [p])
self._gradcheck_log_prob(lambda p: Multinomial(total_count, None, p.log()), [p])
self.assertRaises(NotImplementedError, Multinomial(10, p).rsample)
@unittest.skipIf(not TEST_NUMPY, "NumPy not found")
def test_multinomial_1d_log_prob(self):
total_count = 10
p = variable([0.1, 0.2, 0.3], requires_grad=True)
dist = Multinomial(total_count, probs=p)
x = dist.sample()
log_prob = dist.log_prob(x)
expected = torch.Tensor(scipy.stats.multinomial.logpmf(x.numpy(), n=total_count, p=dist.probs.detach().numpy()))
self.assertEqual(log_prob.data, expected)
dist = Multinomial(total_count, logits=p.log())
x = dist.sample()
log_prob = dist.log_prob(x)
expected = torch.Tensor(scipy.stats.multinomial.logpmf(x.numpy(), n=total_count, p=dist.probs.detach().numpy()))
self.assertEqual(log_prob.data, expected)
def test_multinomial_2d(self):
total_count = 10
probabilities = [[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]]
probabilities_1 = [[1.0, 0.0], [0.0, 1.0]]
p = variable(probabilities, requires_grad=True)
s = variable(probabilities_1, requires_grad=True)
self.assertEqual(Multinomial(total_count, p).sample().size(), (2, 3))
self.assertEqual(Multinomial(total_count, p).sample(sample_shape=(3, 4)).size(), (3, 4, 2, 3))
self.assertEqual(Multinomial(total_count, p).sample((6,)).size(), (6, 2, 3))
set_rng_seed(0)
self._gradcheck_log_prob(lambda p: Multinomial(total_count, p), [p])
p.grad.zero_()
self._gradcheck_log_prob(lambda p: Multinomial(total_count, None, p.log()), [p])
# sample check for extreme value of probs
self.assertEqual(Multinomial(total_count, s).sample().data,
torch.Tensor([[total_count, 0], [0, total_count]]))
# check entropy computation
self.assertRaises(NotImplementedError, Multinomial(10, p).entropy)
def test_categorical_1d(self):
p = variable([0.1, 0.2, 0.3], requires_grad=True)
self.assertTrue(is_all_nan(Categorical(p).mean))
self.assertTrue(is_all_nan(Categorical(p).variance))
self.assertEqual(Categorical(p).sample().size(), ())
self.assertTrue(isinstance(Categorical(p).sample().data, torch.LongTensor))
self.assertEqual(Categorical(p).sample((2, 2)).size(), (2, 2))
self.assertEqual(Categorical(p).sample((1,)).size(), (1,))
self._gradcheck_log_prob(Categorical, (p,))
self.assertRaises(NotImplementedError, Categorical(p).rsample)
def test_categorical_2d(self):
probabilities = [[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]]
probabilities_1 = [[1.0, 0.0], [0.0, 1.0]]
p = variable(probabilities, requires_grad=True)
s = variable(probabilities_1, requires_grad=True)
self.assertEqual(Categorical(p).mean.size(), (2,))
self.assertEqual(Categorical(p).variance.size(), (2,))
self.assertTrue(is_all_nan(Categorical(p).mean))
self.assertTrue(is_all_nan(Categorical(p).variance))
self.assertEqual(Categorical(p).sample().size(), (2,))
self.assertEqual(Categorical(p).sample(sample_shape=(3, 4)).size(), (3, 4, 2))
self.assertEqual(Categorical(p).sample((6,)).size(), (6, 2))
self._gradcheck_log_prob(Categorical, (p,))
# sample check for extreme value of probs
set_rng_seed(0)
self.assertEqual(Categorical(s).sample(sample_shape=(2,)).data,
torch.Tensor([[0, 1], [0, 1]]))
def ref_log_prob(idx, val, log_prob):
sample_prob = p.data[idx][val] / p.data[idx].sum()
self.assertEqual(log_prob, math.log(sample_prob))
self._check_log_prob(Categorical(p), ref_log_prob)
self._check_log_prob(Categorical(logits=p.log()), ref_log_prob)
# check entropy computation
self.assertEqual(Categorical(p).entropy().data, torch.Tensor([1.0114, 1.0297]), prec=1e-4)
self.assertEqual(Categorical(s).entropy().data, torch.Tensor([0.0, 0.0]))
def test_categorical_enumerate_support(self):
examples = [
([0.1, 0.2, 0.7], [0, 1, 2]),
([[0.1, 0.9], [0.3, 0.7]], [[0, 0], [1, 1]]),
]
self._check_enumerate_support(Categorical, examples)
def test_one_hot_categorical_1d(self):
p = variable([0.1, 0.2, 0.3], requires_grad=True)
self.assertEqual(OneHotCategorical(p).sample().size(), (3,))
self.assertTrue(isinstance(OneHotCategorical(p).sample().data, torch.Tensor))
self.assertEqual(OneHotCategorical(p).sample((2, 2)).size(), (2, 2, 3))
self.assertEqual(OneHotCategorical(p).sample((1,)).size(), (1, 3))
self._gradcheck_log_prob(OneHotCategorical, (p,))
self.assertRaises(NotImplementedError, OneHotCategorical(p).rsample)
def test_one_hot_categorical_2d(self):
probabilities = [[0.1, 0.2, 0.3], [0.5, 0.3, 0.2]]
probabilities_1 = [[1.0, 0.0], [0.0, 1.0]]
p = variable(probabilities, requires_grad=True)
s = variable(probabilities_1, requires_grad=True)
self.assertEqual(OneHotCategorical(p).sample().size(), (2, 3))
self.assertEqual(OneHotCategorical(p).sample(sample_shape=(3, 4)).size(), (3, 4, 2, 3))
self.assertEqual(OneHotCategorical(p).sample((6,)).size(), (6, 2, 3))
self._gradcheck_log_prob(OneHotCategorical, (p,))
dist = OneHotCategorical(p)
x = dist.sample()
self.assertEqual(dist.log_prob(x), Categorical(p).log_prob(x.max(-1)[1]))
def test_one_hot_categorical_enumerate_support(self):
examples = [
([0.1, 0.2, 0.7], [[1, 0, 0], [0, 1, 0], [0, 0, 1]]),
([[0.1, 0.9], [0.3, 0.7]], [[[1, 0], [1, 0]], [[0, 1], [0, 1]]]),
]
self._check_enumerate_support(OneHotCategorical, examples)
def test_poisson_shape(self):
rate = variable(torch.randn(2, 3).abs(), requires_grad=True)
rate_1d = variable(torch.randn(1).abs(), requires_grad=True)
self.assertEqual(Poisson(rate).sample().size(), (2, 3))
self.assertEqual(Poisson(rate).sample((7,)).size(), (7, 2, 3))
self.assertEqual(Poisson(rate_1d).sample().size(), (1,))
self.assertEqual(Poisson(rate_1d).sample((1,)).size(), (1, 1))
self.assertEqual(Poisson(2.0).sample((2,)).size(), (2,))
@unittest.skipIf(not TEST_NUMPY, "Numpy not found")
def test_poisson_log_prob(self):
rate = variable(torch.randn(2, 3).abs(), requires_grad=True)
rate_1d = variable(torch.randn(1).abs(), requires_grad=True)
def ref_log_prob(idx, x, log_prob):
l = rate.data.view(-1)[idx]
expected = scipy.stats.poisson.logpmf(x, l)
self.assertAlmostEqual(log_prob, expected, places=3)
set_rng_seed(0)
self._check_log_prob(Poisson(rate), ref_log_prob)
self._gradcheck_log_prob(Poisson, (rate,))
self._gradcheck_log_prob(Poisson, (rate_1d,))
@unittest.skipIf(not TEST_NUMPY, "Numpy not found")
def test_poisson_sample(self):
set_rng_seed(1) # see Note [Randomized statistical tests]
for rate in [0.1, 1.0, 5.0]:
self._check_sampler_discrete(Poisson(rate),
scipy.stats.poisson(rate),
'Poisson(lambda={})'.format(rate),
failure_rate=1e-3)
@unittest.skipIf(not TEST_CUDA, "CUDA not found")
@unittest.skipIf(not TEST_NUMPY, "Numpy not found")
def test_poisson_gpu_sample(self):
set_rng_seed(0)
for rate in [0.12, 0.9, 4.0]:
self._check_sampler_discrete(Poisson(torch.Tensor([rate]).cuda()),
scipy.stats.poisson(rate),
'Poisson(lambda={}, cuda)'.format(rate),
failure_rate=1e-3)
def test_relaxed_bernoulli(self):
p = torch.tensor([0.7, 0.2, 0.4], requires_grad=True)
r = torch.tensor(0.3, requires_grad=True)
s = 0.3
temp = torch.tensor(0.67, requires_grad=True)
self.assertEqual(RelaxedBernoulli(temp, p).sample((8,)).size(), (8, 3))
self.assertTrue(isinstance(RelaxedBernoulli(temp, p).sample().data, torch.Tensor))
self.assertEqual(RelaxedBernoulli(temp, r).sample((8,)).size(), (8,))
self.assertEqual(RelaxedBernoulli(temp, r).sample().size(), ())
self.assertEqual(RelaxedBernoulli(temp, r).sample((3, 2)).size(), (3, 2,))
self.assertEqual(RelaxedBernoulli(temp, s).sample().size(), ())
self._gradcheck_log_prob(RelaxedBernoulli, (temp, p))
self._gradcheck_log_prob(RelaxedBernoulli, (temp, r))
# test that rsample doesn't fail
s = RelaxedBernoulli(temp, p).rsample()
s.backward(torch.ones_like(s))
@unittest.skipIf(not TEST_NUMPY, "Numpy not found")
def test_rounded_relaxed_bernoulli(self):
set_rng_seed(0) # see Note [Randomized statistical tests]
class Rounded(object):
def __init__(self, dist):
self.dist = dist
def sample(self, *args, **kwargs):
return torch.round(self.dist.sample(*args, **kwargs))
for probs, temp in product([0.1, 0.2, 0.8], [0.1, 1.0, 10.0]):
self._check_sampler_discrete(Rounded(RelaxedBernoulli(temp, probs)),
scipy.stats.bernoulli(probs),
'Rounded(RelaxedBernoulli(temp={}, probs={}))'.format(temp, probs),
failure_rate=1e-3)
for probs in [0.001, 0.2, 0.999]:
equal_probs = torch.tensor(0.5)
dist = RelaxedBernoulli(1e10, probs)
s = dist.rsample()
self.assertEqual(equal_probs, s)
def test_relaxed_one_hot_categorical_1d(self):
p = variable([0.1, 0.2, 0.3], requires_grad=True)
temp = torch.tensor(0.67, requires_grad=True)
self.assertEqual(RelaxedOneHotCategorical(probs=p, temperature=temp).sample().size(), (3,))
self.assertTrue(isinstance(RelaxedOneHotCategorical(probs=p, temperature=temp).sample().data, torch.Tensor))
self.assertEqual(RelaxedOneHotCategorical(probs=p, temperature=temp).sample((2, 2)).size(), (2, 2, 3))
self.assertEqual(RelaxedOneHotCategorical(probs=p, temperature=temp).sample((1,)).size(), (1, 3))
self._gradcheck_log_prob(RelaxedOneHotCategorical, (temp, p))