def test_gp(self):
d = 3
bounds = torch.tensor([[-1.0] * d, [1.0] * d])
for batch_shape, m, ncat, dtype in itertools.product(
(torch.Size(), torch.Size([2])),
(1, 2),
(0, 1, 3),
(torch.float, torch.double),
):
tkwargs = {"device": self.device, "dtype": dtype}
train_X, train_Y = _get_random_data(batch_shape=batch_shape,
m=m,
d=d,
**tkwargs)
cat_dims = list(range(ncat))
ord_dims = sorted(set(range(d)) - set(cat_dims))
with self.assertRaises(ValueError):
MixedSingleTaskGP(
train_X,
train_Y,
cat_dims=cat_dims,
input_transform=Normalize(d=d,
bounds=bounds.to(**tkwargs),
transform_on_train=True),
)
# test correct indices
if (ncat < 3) and (ncat > 0):
MixedSingleTaskGP(
train_X,
train_Y,
cat_dims=cat_dims,
input_transform=Normalize(
d=d,
bounds=bounds.to(**tkwargs),
transform_on_train=True,
indices=ord_dims,
),
)
with self.assertRaises(ValueError):
MixedSingleTaskGP(
train_X,
train_Y,
cat_dims=cat_dims,
input_transform=Normalize(
d=d,
bounds=bounds.to(**tkwargs),
transform_on_train=True,
indices=cat_dims,
),
)
with self.assertRaises(ValueError):
MixedSingleTaskGP(
train_X,
train_Y,
cat_dims=cat_dims,
input_transform=Normalize(
d=d,
bounds=bounds.to(**tkwargs),
transform_on_train=True,
indices=ord_dims + [random.choice(cat_dims)],
),
)
if len(cat_dims) == 0:
with self.assertRaises(ValueError):
MixedSingleTaskGP(train_X, train_Y, cat_dims=cat_dims)
continue
model = MixedSingleTaskGP(train_X, train_Y, cat_dims=cat_dims)
self.assertEqual(model._ignore_X_dims_scaling_check, cat_dims)
mll = ExactMarginalLogLikelihood(model.likelihood,
model).to(**tkwargs)
with warnings.catch_warnings():
warnings.filterwarnings("ignore", category=OptimizationWarning)
fit_gpytorch_model(mll, options={"maxiter": 1}, max_retries=1)
# test init
self.assertIsInstance(model.mean_module, ConstantMean)
if ncat < 3:
self.assertIsInstance(model.covar_module, AdditiveKernel)
sum_kernel, prod_kernel = model.covar_module.kernels
self.assertIsInstance(sum_kernel, ScaleKernel)
self.assertIsInstance(sum_kernel.base_kernel, AdditiveKernel)
self.assertIsInstance(prod_kernel, ScaleKernel)
self.assertIsInstance(prod_kernel.base_kernel, ProductKernel)
sum_cont_kernel, sum_cat_kernel = sum_kernel.base_kernel.kernels
prod_cont_kernel, prod_cat_kernel = prod_kernel.base_kernel.kernels
self.assertIsInstance(sum_cont_kernel, MaternKernel)
self.assertIsInstance(sum_cat_kernel, ScaleKernel)
self.assertIsInstance(sum_cat_kernel.base_kernel,
CategoricalKernel)
self.assertIsInstance(prod_cont_kernel, MaternKernel)
self.assertIsInstance(prod_cat_kernel, CategoricalKernel)
else:
self.assertIsInstance(model.covar_module, ScaleKernel)
self.assertIsInstance(model.covar_module.base_kernel,
CategoricalKernel)
# test posterior
# test non batch evaluation
X = torch.rand(batch_shape + torch.Size([4, d]), **tkwargs)
expected_shape = batch_shape + torch.Size([4, m])
posterior = model.posterior(X)
self.assertIsInstance(posterior, GPyTorchPosterior)
self.assertEqual(posterior.mean.shape, expected_shape)
self.assertEqual(posterior.variance.shape, expected_shape)
# test adding observation noise
posterior_pred = model.posterior(X, observation_noise=True)
self.assertIsInstance(posterior_pred, GPyTorchPosterior)
self.assertEqual(posterior_pred.mean.shape, expected_shape)
self.assertEqual(posterior_pred.variance.shape, expected_shape)
pvar = posterior_pred.variance
pvar_exp = _get_pvar_expected(posterior, model, X, m)
self.assertTrue(
torch.allclose(pvar, pvar_exp, rtol=1e-4, atol=1e-5))
# test batch evaluation
X = torch.rand(2, *batch_shape, 3, d, **tkwargs)
expected_shape = torch.Size([2]) + batch_shape + torch.Size([3, m])
posterior = model.posterior(X)
self.assertIsInstance(posterior, GPyTorchPosterior)
self.assertEqual(posterior.mean.shape, expected_shape)
# test adding observation noise in batch mode
posterior_pred = model.posterior(X, observation_noise=True)
self.assertIsInstance(posterior_pred, GPyTorchPosterior)
self.assertEqual(posterior_pred.mean.shape, expected_shape)
pvar = posterior_pred.variance
pvar_exp = _get_pvar_expected(posterior, model, X, m)
self.assertTrue(
torch.allclose(pvar, pvar_exp, rtol=1e-4, atol=1e-5))
def test_condition_on_observations(self):
d = 3
for batch_shape, m, ncat, dtype in itertools.product(
(torch.Size(), torch.Size([2])),
(1, 2),
(1, 2),
(torch.float, torch.double),
):
tkwargs = {"device": self.device, "dtype": dtype}
train_X, train_Y = _get_random_data(batch_shape=batch_shape,
m=m,
d=d,
**tkwargs)
cat_dims = list(range(ncat))
model = MixedSingleTaskGP(train_X, train_Y, cat_dims=cat_dims)
# evaluate model
model.posterior(torch.rand(torch.Size([4, d]), **tkwargs))
# test condition_on_observations
fant_shape = torch.Size([2])
# fantasize at different input points
X_fant, Y_fant = _get_random_data(fant_shape + batch_shape,
m=m,
d=d,
n=3,
**tkwargs)
cm = model.condition_on_observations(X_fant, Y_fant)
# fantasize at same input points (check proper broadcasting)
cm_same_inputs = model.condition_on_observations(
X_fant[0],
Y_fant,
)
test_Xs = [
# test broadcasting single input across fantasy and model batches
torch.rand(4, d, **tkwargs),
# separate input for each model batch and broadcast across
# fantasy batches
torch.rand(batch_shape + torch.Size([4, d]), **tkwargs),
# separate input for each model and fantasy batch
torch.rand(fant_shape + batch_shape + torch.Size([4, d]),
**tkwargs),
]
for test_X in test_Xs:
posterior = cm.posterior(test_X)
self.assertEqual(posterior.mean.shape,
fant_shape + batch_shape + torch.Size([4, m]))
posterior_same_inputs = cm_same_inputs.posterior(test_X)
self.assertEqual(
posterior_same_inputs.mean.shape,
fant_shape + batch_shape + torch.Size([4, m]),
)
# check that fantasies of batched model are correct
if len(batch_shape) > 0 and test_X.dim() == 2:
state_dict_non_batch = {
key: (val[0] if val.ndim > 1 else val)
for key, val in model.state_dict().items()
}
model_kwargs_non_batch = {
"train_X": train_X[0],
"train_Y": train_Y[0],
"cat_dims": cat_dims,
}
model_non_batch = type(model)(**model_kwargs_non_batch)
model_non_batch.load_state_dict(state_dict_non_batch)
model_non_batch.eval()
model_non_batch.likelihood.eval()
model_non_batch.posterior(
torch.rand(torch.Size([4, d]), **tkwargs))
cm_non_batch = model_non_batch.condition_on_observations(
X_fant[0][0],
Y_fant[:, 0, :],
)
non_batch_posterior = cm_non_batch.posterior(test_X)
self.assertTrue(
torch.allclose(
posterior_same_inputs.mean[:, 0, ...],
non_batch_posterior.mean,
atol=1e-3,
))
self.assertTrue(
torch.allclose(
posterior_same_inputs.mvn.
covariance_matrix[:, 0, :, :],
non_batch_posterior.mvn.covariance_matrix,
atol=1e-3,
))