Avoid errors in telemetry due to node-based GenerationStrategy

Summary:
The Ax telemetry module currently assumes that `GenerationStrategy` objects are all step-based. This diff a warning and returns a dummy record for those cases to avoid errors with node-based GSs.

The proper fix here is to fully support node-based GSs in telemetry, but that will be a bit more work it seems.

Differential Revision: D59193222

ax/telemetry/ax_client.py

@@ -34,7 +34,7 @@ class AxClientCreatedRecord:
 
     # Dimensionality of transformed SearchSpace can often be much higher due to one-hot
     # encoding of unordered ChoiceParameters
-    transformed_dimensionality: int
+    transformed_dimensionality: Optional[int]
 
     @classmethod
     def from_ax_client(cls, ax_client: AxClient) -> AxClientCreatedRecord:

ax/telemetry/common.py

@@ -5,10 +5,12 @@
 
 # pyre-strict
 
+import warnings
 from datetime import datetime
-from typing import Any, Dict, List, Tuple, Type
+from typing import Any, Dict, List, Optional, Tuple, Type
 
 from ax.core.experiment import Experiment
+from ax.exceptions.core import AxWarning
 
 from ax.modelbridge.generation_strategy import GenerationStep, GenerationStrategy
 
@@ -32,11 +34,20 @@
 
 def _get_max_transformed_dimensionality(
     search_space: SearchSpace, generation_strategy: GenerationStrategy
-) -> int:
+) -> Optional[int]:
     """
     Get dimensionality of transformed SearchSpace for all steps in the
     GenerationStrategy and return the maximum.
     """
+    if generation_strategy.is_node_based:
+        warnings.warn(
+            "`_get_max_transformed_dimensionality` does not fully support node-based "
+            "generation strategies. This will result in an incomplete record.",
+            category=AxWarning,
+            stacklevel=4,
+        )
+        # TODO [T192965545]: Support node-based generation strategies in telemetry
+        return None
 
     transforms_by_step = [
         _extract_transforms_and_configs(step=step)

ax/telemetry/generation_strategy.py

@@ -7,8 +7,13 @@
 
 from __future__ import annotations
 
+import warnings
+
 from dataclasses import dataclass
 from math import inf
+from typing import Optional
+
+from ax.exceptions.core import AxWarning
 
 from ax.modelbridge.generation_strategy import GenerationStrategy
 from ax.telemetry.common import INITIALIZATION_MODELS, OTHER_MODELS
@@ -26,17 +31,35 @@ class GenerationStrategyCreatedRecord:
     generation_strategy_name: str
 
     # -1 indicates unlimited trials requested, 0 indicates no trials requested
-    num_requested_initialization_trials: int  # Typically the number of Sobol trials
-    num_requested_bayesopt_trials: int
-    num_requested_other_trials: int
+    num_requested_initialization_trials: Optional[
+        int  # Typically the number of Sobol trials˝
+    ]
+    num_requested_bayesopt_trials: Optional[int]
+    num_requested_other_trials: Optional[int]
 
     # Minimum `max_parallelism` across GenerationSteps, i.e. the bottleneck
-    max_parallelism: int
+    max_parallelism: Optional[int]
 
     @classmethod
     def from_generation_strategy(
         cls, generation_strategy: GenerationStrategy
     ) -> GenerationStrategyCreatedRecord:
+        if generation_strategy.is_node_based:
+            warnings.warn(
+                "`GenerationStrategyCreatedRecord` does not fully support node-based "
+                "generation strategies. This will result in an incomplete record.",
+                category=AxWarning,
+                stacklevel=4,
+            )
+            # TODO [T192965545]: Support node-based generation strategies in telemetry
+            return cls(
+                generation_strategy_name=generation_strategy.name,
+                num_requested_initialization_trials=None,
+                num_requested_bayesopt_trials=None,
+                num_requested_other_trials=None,
+                max_parallelism=None,
+            )
+
         # Minimum `max_parallelism` across GenerationSteps, i.e. the bottleneck
         true_max_parallelism = min(
             step.max_parallelism or inf for step in generation_strategy._steps

ax/telemetry/scheduler.py

@@ -43,7 +43,7 @@ class SchedulerCreatedRecord:
 
     # Dimensionality of transformed SearchSpace can often be much higher due to one-hot
     # encoding of unordered ChoiceParameters
-    transformed_dimensionality: int
+    transformed_dimensionality: Optional[int]
 
     @classmethod
     def from_scheduler(cls, scheduler: Scheduler) -> SchedulerCreatedRecord:

ax/telemetry/tests/test_generation_strategy.py

@@ -6,9 +6,13 @@
 
 # pyre-strict
 
+from ax.exceptions.core import AxWarning
 from ax.telemetry.generation_strategy import GenerationStrategyCreatedRecord
 from ax.utils.common.testutils import TestCase
-from ax.utils.testing.modeling_stubs import get_generation_strategy
+from ax.utils.testing.modeling_stubs import (
+    get_generation_strategy,
+    sobol_gpei_generation_node_gs,
+)
 
 
 class TestGenerationStrategy(TestCase):
@@ -25,3 +29,21 @@ def test_generation_strategy_created_record_from_generation_strategy(self) -> No
             max_parallelism=3,
         )
         self.assertEqual(record, expected)
+
+    def test_generation_strategy_created_record_node_based(self) -> None:
+        gs = sobol_gpei_generation_node_gs()
+        with self.assertWarnsRegex(
+            AxWarning,
+            "`GenerationStrategyCreatedRecord` does not fully support node-based*",
+        ):
+            record = GenerationStrategyCreatedRecord.from_generation_strategy(
+                generation_strategy=gs
+            )
+        expected = GenerationStrategyCreatedRecord(
+            generation_strategy_name="Sobol+GPEI_Nodes",
+            num_requested_initialization_trials=None,
+            num_requested_bayesopt_trials=None,
+            num_requested_other_trials=None,
+            max_parallelism=None,
+        )
+        self.assertEqual(record, expected)