Allow AskTellOptimizer that doesn't track datasets (#834)

tests/integration/test_ask_tell_optimization.py

@@ -16,6 +16,7 @@
 import copy
 import pickle
 import tempfile
+from dataclasses import replace
 from typing import Callable, Mapping, Tuple, Union
 
 import numpy.testing as npt
@@ -34,8 +35,8 @@
     TREGOBox,
 )
 from trieste.acquisition.utils import copy_to_local_models
-from trieste.ask_tell_optimization import AskTellOptimizer
-from trieste.bayesian_optimizer import OptimizationResult, Record
+from trieste.ask_tell_optimization import AskTellOptimizer, AskTellOptimizerState
+from trieste.bayesian_optimizer import OptimizationResult
 from trieste.data import Dataset
 from trieste.logging import set_step_number, tensorboard_writer
 from trieste.models import TrainableProbabilisticModel
@@ -150,16 +151,22 @@ def test_ask_tell_optimizer_finds_minima_of_the_scaled_branin_function(
 
 
 @random_seed
+@pytest.mark.parametrize("track_data", [True, False])
 @pytest.mark.parametrize(*copy.deepcopy(OPTIMIZER_PARAMS))
 def test_ask_tell_optimizer_finds_minima_of_simple_quadratic(
+    track_data: bool,
     num_steps: int,
     reload_state: bool,
     acquisition_rule_fn: AcquisitionRuleFunction | Tuple[AcquisitionRuleFunction, int],
 ) -> None:
     # for speed reasons we sometimes test with a simple quadratic defined on the same search space
     # branin; currently assume that every rule should be able to solve this in 5 steps
     _test_ask_tell_optimization_finds_minima(
-        False, min(num_steps, 5), reload_state, acquisition_rule_fn
+        False,
+        min(num_steps, 5),
+        reload_state,
+        acquisition_rule_fn,
+        track_data=track_data,
     )
 
 
@@ -168,6 +175,7 @@ def _test_ask_tell_optimization_finds_minima(
     num_steps: int,
     reload_state: bool,
     acquisition_rule_fn: AcquisitionRuleFunction | Tuple[AcquisitionRuleFunction, int],
+    track_data: bool = True,
 ) -> None:
     # For the case when optimization state is saved and reload on each iteration
     # we need to use new acquisition function object to imitate real life usage
@@ -195,7 +203,7 @@ def _test_ask_tell_optimization_finds_minima(
         with tensorboard_writer(summary_writer):
             set_step_number(0)
             ask_tell = AskTellOptimizer(
-                search_space, initial_dataset, models, acquisition_rule_fn()
+                search_space, initial_dataset, models, acquisition_rule_fn(), track_data=track_data
             )
 
             for i in range(1, num_steps + 1):
@@ -206,10 +214,10 @@ def _test_ask_tell_optimization_finds_minima(
                 new_point = ask_tell.ask()
 
                 if reload_state:
-                    state: Record[
+                    state: AskTellOptimizerState[
                         None | State[TensorType, AsynchronousRuleState | BatchTrustRegionBox.State],
                         GaussianProcessRegression,
-                    ] = ask_tell.to_record()
+                    ] = ask_tell.to_state()
                     written_state = pickle.dumps(state)
 
                 # If query points are rank 3, then use a batched observer.
@@ -222,11 +230,26 @@ def _test_ask_tell_optimization_finds_minima(
 
                 if reload_state:
                     state = pickle.loads(written_state)
+                    state_record = state.record
+                    if not track_data:
+                        # reload using the up-to-date dataset
+                        state_record = replace(state_record, datasets=initial_dataset)
                     ask_tell = AskTellOptimizer.from_record(
-                        state, search_space, acquisition_rule_fn()
+                        state_record,
+                        search_space,
+                        acquisition_rule_fn(),
+                        track_data=track_data,
+                        local_data_ixs=state.local_data_ixs,
                     )
 
-                ask_tell.tell(new_data_point)
+                if track_data:
+                    ask_tell.tell(new_data_point)
+                else:
+                    if isinstance(new_data_point, Dataset):
+                        new_data_point = {OBJECTIVE: new_data_point}
+                    for tag in initial_dataset.keys():
+                        initial_dataset[tag] += new_data_point[tag]
+                    ask_tell.tell(initial_dataset)
 
     result: OptimizationResult[
         None | State[TensorType, AsynchronousRuleState | BatchTrustRegionBox.State],

tests/unit/acquisition/test_utils.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 from __future__ import annotations
 
-from typing import Any, Mapping, Optional
+from typing import Any, Mapping, Optional, Sequence
 from unittest.mock import MagicMock
 
 import numpy as np
@@ -31,7 +31,7 @@
 )
 from trieste.data import Dataset
 from trieste.space import Box, SearchSpaceType
-from trieste.types import Tag
+from trieste.types import Tag, TensorType
 from trieste.utils.misc import LocalizedTag
 
 
@@ -166,6 +166,47 @@ def test_with_local_datasets(
                 assert datasets[ltag] is original_datasets[global_tag]
 
 
+@pytest.mark.parametrize(
+    "datasets, indices",
+    [
+        (
+            {
+                "a": Dataset(tf.constant([[1.0, 2.0], [3.0, 4.0]]), tf.constant([[5.0], [6.0]])),
+                "b": Dataset(tf.constant([[7.0, 8.0], [9.0, 1.0]]), tf.constant([[2.0], [3.0]])),
+            },
+            [tf.constant([0]), tf.constant([0, 1])],
+        ),
+        (
+            {
+                "a": Dataset(tf.constant([[1.0, 2.0], [3.0, 4.0]]), tf.constant([[5.0], [6.0]])),
+                "b": Dataset(tf.constant([[7.0, 8.0], [9.0, 1.0]]), tf.constant([[2.0], [3.0]])),
+            },
+            [tf.constant([], dtype=tf.int32), tf.constant([0])],
+        ),
+    ],
+)
+def test_with_local_datasets_indices(
+    datasets: Mapping[Tag, Dataset], indices: Sequence[TensorType]
+) -> None:
+    original_datasets = dict(datasets).copy()
+    global_tags = {t for t in original_datasets if not LocalizedTag.from_tag(t).is_local}
+    num_global_datasets = len(global_tags)
+
+    num_local_datasets = len(indices)
+    datasets = with_local_datasets(datasets, num_local_datasets, indices)
+    assert len(datasets) == num_global_datasets * (1 + num_local_datasets)
+
+    for global_tag in global_tags:
+        assert datasets[global_tag] is original_datasets[global_tag]
+        for i in range(num_local_datasets):
+            ltag = LocalizedTag(global_tag, i)
+            if ltag in original_datasets:
+                assert datasets[ltag] is original_datasets[ltag]
+            else:
+                assert len(datasets[ltag].query_points) == len(indices[i])
+                assert len(datasets[ltag].observations) == len(indices[i])
+
+
 @pytest.mark.parametrize(
     "points, tolerance, expected_mask",
     [

tests/unit/models/test_interfaces.py

@@ -78,6 +78,9 @@ def _model_stack() -> (
 
 def test_model_stack_predict() -> None:
     stack, (model01, model2, model3) = _model_stack()
+    assert all(
+        isinstance(model, TrainableProbabilisticModel) for model in (stack, model01, model2, model3)
+    )
     query_points = tf.random.uniform([5, 7, 3])
     mean, var = stack.predict(query_points)