def test_KnowledgeGradient(self):
model = KnowledgeGradient()
model.fit(
Xs=self.Xs,
Ys=self.Ys,
Yvars=self.Yvars,
bounds=self.bounds,
feature_names=self.feature_names,
metric_names=self.metric_names,
task_features=[],
fidelity_features=[],
)
n = 2
X_dummy = torch.rand(1, n, 4, dtype=self.dtype, device=self.device)
acq_dummy = torch.tensor(0.0, dtype=self.dtype, device=self.device)
with mock.patch(self.optimize_acqf) as mock_optimize_acqf:
mock_optimize_acqf.side_effect = [(X_dummy, acq_dummy)]
Xgen, wgen, _, __ = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=None,
model_gen_options={
"acquisition_function_kwargs": self.acq_options,
"optimizer_kwargs": self.optimizer_options,
},
)
self.assertTrue(torch.equal(Xgen, X_dummy.cpu()))
self.assertTrue(torch.equal(wgen, torch.ones(n, dtype=self.dtype)))
# called once, the best point call is not caught by mock
mock_optimize_acqf.assert_called_once()
ini_dummy = torch.rand(10, 32, 3, dtype=self.dtype, device=self.device)
optimizer_options2 = {
"num_restarts": 1,
"raw_samples": 1,
"maxiter": 5,
"batch_limit": 1,
"partial_restarts": 2,
}
with mock.patch(
"ax.models.torch.botorch_kg.gen_one_shot_kg_initial_conditions",
return_value=ini_dummy,
) as mock_warmstart_initialization:
Xgen, wgen, _, __ = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=None,
model_gen_options={
"acquisition_function_kwargs": self.acq_options,
"optimizer_kwargs": optimizer_options2,
},
)
mock_warmstart_initialization.assert_called_once()
obj = ScalarizedObjective(weights=self.objective_weights)
dummy_acq = PosteriorMean(model=model.model, objective=obj)
with mock.patch("ax.models.torch.utils.PosteriorMean",
return_value=dummy_acq) as mock_posterior_mean:
Xgen, wgen, _, __ = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=None,
model_gen_options={
"acquisition_function_kwargs": self.acq_options,
"optimizer_kwargs": optimizer_options2,
},
)
self.assertEqual(mock_posterior_mean.call_count, 2)
# Check best point selection within bounds (some numerical tolerance)
xbest = model.best_point(bounds=self.bounds,
objective_weights=self.objective_weights)
lb = torch.tensor([b[0] for b in self.bounds]) - 1e-5
ub = torch.tensor([b[1] for b in self.bounds]) + 1e-5
self.assertTrue(torch.all(xbest <= ub))
self.assertTrue(torch.all(xbest >= lb))
# test error message
linear_constraints = (
torch.tensor([[0.0, 0.0, 0.0], [0.0, 1.0, 0.0]]),
torch.tensor([[0.5], [1.0]]),
)
with self.assertRaises(UnsupportedError):
Xgen, wgen = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=linear_constraints,
)
def test_KnowledgeGradient_multifidelity(self):
model = KnowledgeGradient()
model.fit(
Xs=self.Xs,
Ys=self.Ys,
Yvars=self.Yvars,
bounds=self.bounds,
task_features=[],
feature_names=self.feature_names,
metric_names=[],
fidelity_features=[2],
)
# Check best point selection within bounds (some numerical tolerance)
xbest = model.best_point(
bounds=self.bounds,
objective_weights=self.objective_weights,
target_fidelities={2: 5.0},
)
lb = torch.tensor([b[0] for b in self.bounds]) - 1e-5
ub = torch.tensor([b[1] for b in self.bounds]) + 1e-5
self.assertTrue(torch.all(xbest <= ub))
self.assertTrue(torch.all(xbest >= lb))
# check error when no target fidelities are specified
with self.assertRaises(RuntimeError):
model.best_point(bounds=self.bounds,
objective_weights=self.objective_weights)
# check generation
n = 2
X_dummy = torch.zeros(1, n, 3, dtype=self.dtype, device=self.device)
acq_dummy = torch.tensor(0.0, dtype=self.dtype, device=self.device)
dummy = (X_dummy, acq_dummy)
with mock.patch(self.optimize_acqf,
side_effect=[dummy]) as mock_optimize_acqf:
Xgen, wgen, _, __ = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=None,
model_gen_options={
"acquisition_function_kwargs": self.acq_options,
"optimizer_kwargs": self.optimizer_options,
},
target_fidelities={2: 5.0},
)
self.assertTrue(torch.equal(Xgen, X_dummy.cpu()))
self.assertTrue(torch.equal(wgen, torch.ones(n, dtype=self.dtype)))
mock_optimize_acqf.assert_called(
) # called twice, once for best_point
# test error message
linear_constraints = (
torch.tensor([[0.0, 0.0, 0.0], [0.0, 1.0, 0.0]]),
torch.tensor([[0.5], [1.0]]),
)
with self.assertRaises(UnsupportedError):
xbest = model.best_point(
bounds=self.bounds,
linear_constraints=linear_constraints,
objective_weights=self.objective_weights,
target_fidelities={2: 1.0},
)
def test_KnowledgeGradient_helpers(self):
model = KnowledgeGradient()
model.fit(
Xs=self.Xs,
Ys=self.Ys,
Yvars=self.Yvars,
bounds=self.bounds,
feature_names=self.feature_names,
metric_names=self.metric_names,
task_features=[],
fidelity_features=[],
)
# test _instantiate_KG
objective = ScalarizedObjective(weights=self.objective_weights)
X_dummy = torch.ones(1, 3, dtype=self.dtype, device=self.device)
# test acquisition setting
acq_function = _instantiate_KG(model=model.model,
objective=objective,
n_fantasies=10,
qmc=True)
self.assertIsInstance(acq_function.sampler, SobolQMCNormalSampler)
self.assertIsInstance(acq_function.objective, ScalarizedObjective)
self.assertEqual(acq_function.num_fantasies, 10)
acq_function = _instantiate_KG(model=model.model,
objective=objective,
n_fantasies=10,
qmc=False)
self.assertIsInstance(acq_function.sampler, IIDNormalSampler)
acq_function = _instantiate_KG(model=model.model,
objective=objective,
qmc=False)
self.assertIsNone(acq_function.inner_sampler)
acq_function = _instantiate_KG(model=model.model,
objective=objective,
qmc=True,
X_pending=X_dummy)
self.assertIsNone(acq_function.inner_sampler)
self.assertTrue(torch.equal(acq_function.X_pending, X_dummy))
# test _get_obj()
outcome_constraints = (torch.tensor([[1.0]]), torch.tensor([[0.5]]))
objective_weights = torch.ones(1, dtype=self.dtype, device=self.device)
# test use_scalarized_objective kwarg
self.assertIsInstance(
get_botorch_objective(
model=model.model,
outcome_constraints=outcome_constraints,
objective_weights=objective_weights,
X_observed=X_dummy,
use_scalarized_objective=False,
),
ConstrainedMCObjective,
)
self.assertIsInstance(
get_botorch_objective(
model=model.model,
outcome_constraints=outcome_constraints,
objective_weights=objective_weights,
X_observed=X_dummy,
),
ConstrainedMCObjective,
)
self.assertIsInstance(
get_botorch_objective(
model=model.model,
objective_weights=objective_weights,
X_observed=X_dummy,
use_scalarized_objective=False,
),
LinearMCObjective,
)
self.assertIsInstance(
get_botorch_objective(
model=model.model,
objective_weights=objective_weights,
X_observed=X_dummy,
),
ScalarizedObjective,
)
# test _get_best_point_acqf
acq_function, non_fixed_idcs = model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
)
self.assertIsInstance(acq_function, qSimpleRegret)
self.assertIsInstance(acq_function.sampler, SobolQMCNormalSampler)
self.assertIsNone(non_fixed_idcs)
acq_function, non_fixed_idcs = model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
qmc=False,
)
self.assertIsInstance(acq_function.sampler, IIDNormalSampler)
self.assertIsNone(non_fixed_idcs)
with self.assertRaises(RuntimeError):
model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
target_fidelities={1: 1.0},
)
# multi-fidelity tests
model = KnowledgeGradient()
model.fit(
Xs=self.Xs,
Ys=self.Ys,
Yvars=self.Yvars,
bounds=self.bounds,
task_features=[],
feature_names=self.feature_names,
metric_names=self.metric_names,
fidelity_features=[-1],
)
acq_function = _instantiate_KG(
model=model.model,
objective=objective,
target_fidelities={2: 1.0},
current_value=0,
)
self.assertIsInstance(acq_function, qMultiFidelityKnowledgeGradient)
acq_function = _instantiate_KG(
model=model.model,
objective=LinearMCObjective(weights=self.objective_weights),
)
self.assertIsInstance(acq_function.inner_sampler,
SobolQMCNormalSampler)
# test error that target fidelity and fidelity weight indices must match
with self.assertRaises(RuntimeError):
_instantiate_KG(
model=model.model,
objective=objective,
target_fidelities={1: 1.0},
fidelity_weights={2: 1.0},
current_value=0,
)
# test _get_best_point_acqf
acq_function, non_fixed_idcs = model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
target_fidelities={2: 1.0},
)
self.assertIsInstance(acq_function, FixedFeatureAcquisitionFunction)
self.assertIsInstance(acq_function.acq_func.sampler,
SobolQMCNormalSampler)
self.assertEqual(non_fixed_idcs, [0, 1])
acq_function, non_fixed_idcs = model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
target_fidelities={2: 1.0},
qmc=False,
)
self.assertIsInstance(acq_function, FixedFeatureAcquisitionFunction)
self.assertIsInstance(acq_function.acq_func.sampler, IIDNormalSampler)
self.assertEqual(non_fixed_idcs, [0, 1])
# test error that fixed features are provided
with self.assertRaises(RuntimeError):
model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
qmc=False,
)
# test error if fixed features are also fidelity features
with self.assertRaises(RuntimeError):
model._get_best_point_acqf(
objective_weights=objective_weights,
outcome_constraints=outcome_constraints,
X_observed=X_dummy,
fixed_features={2: 2.0},
target_fidelities={2: 1.0},
qmc=False,
)
def test_KnowledgeGradient_multifidelity(self):
model = KnowledgeGradient()
model.fit(
Xs=self.Xs,
Ys=self.Ys,
Yvars=self.Yvars,
bounds=self.bounds,
task_features=[],
feature_names=self.feature_names,
metric_names=[],
fidelity_features=[-1],
)
# Check best point selection
X_dummy = torch.tensor([1.0, 2.0])
acq_dummy = torch.tensor(0.0)
with mock.patch(self.optimize_acqf,
return_value=(X_dummy,
acq_dummy)) as mock_optimize_acqf:
xbest = model.best_point(
bounds=self.bounds,
objective_weights=self.objective_weights,
target_fidelities={2: 1.0},
)
self.assertTrue(torch.equal(xbest, torch.tensor([1.0, 2.0, 1.0])))
mock_optimize_acqf.assert_called_once()
# check error whenf no target fidelities are specified
with self.assertRaises(RuntimeError):
model.best_point(bounds=self.bounds,
objective_weights=self.objective_weights)
# check generation
n = 2
X_dummy = torch.zeros(12, 1, 2, dtype=self.dtype, device=self.device)
X_dummy2 = torch.zeros(1, n, 3, dtype=self.dtype, device=self.device)
acq_dummy = torch.tensor(0.0, dtype=self.dtype, device=self.device)
dummy1 = (X_dummy, acq_dummy)
dummy2 = (X_dummy2, acq_dummy)
with mock.patch(self.optimize_acqf,
side_effect=[dummy1, dummy2, dummy1,
dummy2]) as mock_optimize_acqf:
Xgen, wgen, _ = model.gen(
n=n,
bounds=self.bounds,
objective_weights=self.objective_weights,
outcome_constraints=None,
linear_constraints=None,
model_gen_options={
"acquisition_function_kwargs": self.acq_options,
"optimizer_kwargs": self.optimizer_options,
},
target_fidelities={2: 1.0},
)
self.assertTrue(torch.equal(Xgen, X_dummy2.cpu()))
self.assertTrue(torch.equal(wgen, torch.ones(n, dtype=self.dtype)))
mock_optimize_acqf.assert_called(
) # called twice, once for best_point
# test error message
linear_constraints = (
torch.tensor([[0.0, 0.0, 0.0], [0.0, 1.0, 0.0]]),
torch.tensor([[0.5], [1.0]]),
)
with self.assertRaises(UnsupportedError):
xbest = model.best_point(
bounds=self.bounds,
linear_constraints=linear_constraints,
objective_weights=self.objective_weights,
target_fidelities={2: 1.0},
)