Fix a bogus translation of the use_complement_as_test parameter that leaded to a systematic model testing

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Fixed
 - (`core`) Fix a RuntimeException error when automatically correcting deprecated data paths in task args
+- (`core`) Fix a bogus translation of the `use_complement_as_test` parameter that leaded to a systematic model testing.
 
 ## 11.0.1.0 - 2026-07-02
 

khiops/core/api.py

@@ -361,7 +361,7 @@ def _preprocess_task_arguments(task_args):
         if task_args["use_complement_as_test"]:
             task_args["test_database_mode"] = "Complementary"
         else:
-            task_args["test_database_mode"] = "None"
+            task_args["test_database_mode"] = "none"
         del task_args["use_complement_as_test"]
 
     # Preprocess the database format parameters

tests/resources/scenario_generation/api/train_predictor_no_model_testing/ref/Adult._kh

@@ -0,0 +1,69 @@
+// Scenario for task train_predictor
+// Dictionary file and class settings
+ClassManagement.OpenFile
+ClassFileName Adult/Adult.kdic //
+OK
+
+// Train/test database settings
+TrainDatabase.ClassName Adult
+TrainDatabase.DatabaseSpec.Data.DatabaseFiles.List.Key
+TrainDatabase.DatabaseSpec.Data.DatabaseFiles.DataTableName Adult/Adult.txt //
+TrainDatabase.DatabaseSpec.Data.HeaderLineUsed true
+TrainDatabase.DatabaseSpec.Data.FieldSeparator 
+TrainDatabase.DatabaseSpec.Data.DatabaseFormatDetector.DetectFileFormat
+TrainDatabase.DatabaseSpec.Sampling.SampleNumberPercentage 70.0
+TrainDatabase.DatabaseSpec.Sampling.SamplingMode Include sample
+TrainDatabase.DatabaseSpec.Selection.SelectionAttribute 
+TrainDatabase.DatabaseSpec.Selection.SelectionValue 
+TrainDatabase.TestDatabaseSpecificationMode none
+
+// Target variable
+AnalysisSpec.TargetAttributeName class
+AnalysisSpec.MainTargetModality 
+
+// Do data preparation only
+AnalysisSpec.PredictorsSpec.AdvancedSpec.DataPreparationOnly false
+
+// Selective Naive Bayes settings
+AnalysisSpec.PredictorsSpec.AdvancedSpec.SelectiveNaiveBayesParameters.TrainParameters.MaxEvaluatedAttributeNumber 0
+AnalysisSpec.PredictorsSpec.AdvancedSpec.SelectiveNaiveBayesParameters.SelectionParameters.MaxSelectedAttributeNumber 0
+
+// Feature engineering
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxTextFeatureNumber 10000
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxTreeNumber 10
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxAttributePairNumber 0
+AnalysisSpec.PredictorsSpec.AdvancedSpec.InspectAttributePairsParameters
+AllAttributePairs true
+Exit
+AnalysisSpec.PredictorsSpec.ConstructionSpec.KeepSelectedAttributesOnly true
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxConstructedAttributeNumber 1000
+AnalysisSpec.PredictorsSpec.AdvancedSpec.InspectConstructionDomain
+Exit
+
+//  Text feature parameters
+AnalysisSpec.PredictorsSpec.AdvancedSpec.InspectTextFeaturesParameters 
+TextFeatures words
+Exit
+
+
+// Data preparation (discretization & grouping) settings
+AnalysisSpec.PreprocessingSpec.TargetGrouped false
+AnalysisSpec.PreprocessingSpec.InspectAdvancedParameters
+DiscretizerUnsupervisedMethodName MODL
+GrouperUnsupervisedMethodName MODL
+Exit
+
+// Max parts
+AnalysisSpec.PreprocessingSpec.MaxPartNumber 0
+
+// Output settings
+AnalysisResults.ReportFileName train_predictor_file_paths/AnalysisResults.khj //
+
+// Build model
+ComputeStats
+
+// End of scenario for task train_predictor
+
+// Exit Khiops
+ClassManagement.Quit
+OK

tests/test_core.py

@@ -750,6 +750,43 @@ def test_api_scenario_generation(self):
         # Restore the default runner
         kh.set_runner(default_runner)
 
+    def test_correct_args_translation(self):
+        """Tests the translation of specific args is correct
+        so that Khiops takes them into account
+        """
+        # Set the root directory of this test
+        test_resources_dir = os.path.join(resources_dir(), "scenario_generation", "api")
+
+        # Use the test runner that only compares the scenarios
+        default_runner = kh.get_runner()
+        test_runner = ScenarioWriterRunner(self, test_resources_dir)
+        kh.set_runner(test_runner)
+
+        test_runner.test_name = "train_predictor_no_model_testing"
+        test_runner.subtest_name = "Adult"
+        # Clean the directory for this method's tests
+        cleanup_dir(test_runner.output_scenario_dir, "*/output/*._kh", verbose=True)
+
+        kh.train_predictor(
+            dictionary_file_path_or_domain="Adult/Adult.kdic",
+            dictionary_name="Adult",
+            data_table_path="Adult/Adult.txt",
+            target_variable="class",
+            analysis_report_file_path="train_predictor_file_paths/AnalysisResults.khj",
+            use_complement_as_test=False,
+        )
+
+        # Compare the reference with the output
+        assert_files_equal(
+            self,
+            test_runner.ref_scenario_path,
+            test_runner.output_scenario_path,
+            line_comparator=scenario_line_comparator,
+        )
+
+        # Restore the default runner
+        kh.set_runner(default_runner)
+
     def test_data_path_deprecation_in_api_method(self):
         """Tests if the core.api deprecates legacy data paths"""
         # Set the root directory of these tests