Include exception message in ErrorAnalysisCard subtitle

Summary:
The exception message is now displayed in the ErrorAnalysisCard subtitle, allowing users to immediately see the reasoning (e.g., why an analysis is not applicable) without needing to expand the error card.

Previously, the subtitle only showed a generic message like "AnalysisNotApplicableStateError encountered while computing ParallelCoordinatesPlot." Now it shows the actual exception message, such as "AnalysisNotApplicableStateError: Experiment has no trials", providing immediate context.

Differential Revision: D94617700

Author: shrutipatel31

ax/analysis/analysis.py

@@ -206,10 +206,19 @@ def error_card_from_analysis_e(
     analysis_name = analysis_e.analysis.__class__.__name__
     exception_name = analysis_e.exception.__class__.__name__
 
+    # Include the exception message in the subtitle if available, so users can
+    # see the reasoning (e.g., why an analysis is not applicable) without
+    # needing to expand the error card.
+    exception_message = str(analysis_e.exception)
+    if exception_message:
+        subtitle = f"{exception_name}: {exception_message}"
+    else:
+        subtitle = f"{exception_name} encountered while computing {analysis_name}."
+
     return ErrorAnalysisCard(
         name=analysis_name,
         title=f"{analysis_name} Error",
-        subtitle=f"{exception_name} encountered while computing {analysis_name}.",
+        subtitle=subtitle,
         df=pd.DataFrame(),
         blob=analysis_e.tb_str() or "",
     )

ax/api/tests/test_client.py

@@ -23,7 +23,6 @@
 from ax.api.protocols.metric import IMetric
 from ax.api.protocols.runner import IRunner
 from ax.api.types import TParameterization
-from ax.core.analysis_card import AnalysisCard
 from ax.core.data import Data
 from ax.core.experiment import Experiment
 from ax.core.map_metric import MapMetric
@@ -1278,14 +1277,13 @@ def test_compute_analyses(self) -> None:
         self.assertEqual(len(cards), 1)
         self.assertEqual(cards[0].name, "ParallelCoordinatesPlot")
         self.assertEqual(cards[0].title, "ParallelCoordinatesPlot Error")
-        self.assertEqual(
+        self.assertIn(
+            "AnalysisNotApplicableStateError",
             cards[0].subtitle,
-            "AnalysisNotApplicableStateError encountered while computing "
-            "ParallelCoordinatesPlot.",
         )
         self.assertIn(
             "Experiment has no trials",
-            assert_is_instance(cards[0], AnalysisCard).blob,
+            cards[0].subtitle,
         )
 
         for trial_index, _ in client.get_next_trials(max_trials=1).items():