refactor: remove unused MappingPath from FactCheckModelConfig

bench/hallucination/config-7b.yaml

@@ -33,7 +33,6 @@ hallucination_mitigation:
     model_id: "models/halugate-sentinel"
     threshold: 0.6
     use_cpu: true
-    mapping_path: "models/halugate-sentinel/fact_check_mapping.json"
 
   # Hallucination detector: verifies if LLM response is grounded in context
   # Using large model (395M params) for better accuracy

bench/hallucination/config.yaml

@@ -33,7 +33,6 @@ hallucination_mitigation:
     model_id: "models/halugate-sentinel"
     threshold: 0.6
     use_cpu: true
-    mapping_path: "models/halugate-sentinel/fact_check_mapping.json"
 
   # Hallucination detector: verifies if LLM response is grounded in context
   # Using large model (395M params) for better accuracy

config/testing/config.hallucination.yaml

@@ -42,7 +42,6 @@ hallucination_mitigation:
     model_id: "models/halugate-sentinel"
     threshold: 0.6
     use_cpu: true
-    mapping_path: "models/halugate-sentinel/fact_check_mapping.json"
 
   # Hallucination detector: verifies if LLM response is grounded in context
   hallucination_model:

src/semantic-router/pkg/classification/fact_check_classifier.go

@@ -49,37 +49,16 @@ func (c *FactCheckClassifier) Initialize() error {
 		return nil
 	}
 
-	// Load mapping if configured
-	if c.config.MappingPath != "" {
-		mapping, err := LoadFactCheckMapping(c.config.MappingPath)
-		if err != nil {
-			logging.Warnf("Failed to load fact-check mapping from %s: %v, using defaults", c.config.MappingPath, err)
-			// Create default mapping
-			c.mapping = &FactCheckMapping{
-				LabelToIdx: map[string]int{
-					FactCheckLabelNotNeeded: 0,
-					FactCheckLabelNeeded:    1,
-				},
-				IdxToLabel: map[string]string{
-					"0": FactCheckLabelNotNeeded,
-					"1": FactCheckLabelNeeded,
-				},
-			}
-		} else {
-			c.mapping = mapping
-		}
-	} else {
-		// Create default mapping
-		c.mapping = &FactCheckMapping{
-			LabelToIdx: map[string]int{
-				FactCheckLabelNotNeeded: 0,
-				FactCheckLabelNeeded:    1,
-			},
-			IdxToLabel: map[string]string{
-				"0": FactCheckLabelNotNeeded,
-				"1": FactCheckLabelNeeded,
-			},
-		}
+	// Use default mapping (no external mapping file needed)
+	c.mapping = &FactCheckMapping{
+		LabelToIdx: map[string]int{
+			FactCheckLabelNotNeeded: 0,
+			FactCheckLabelNeeded:    1,
+		},
+		IdxToLabel: map[string]string{
+			"0": FactCheckLabelNotNeeded,
+			"1": FactCheckLabelNeeded,
+		},
 	}
 
 	// Initialize ML model - ModelID is required

src/semantic-router/pkg/classification/hallucination_test.go

@@ -480,7 +480,6 @@ var _ = Describe("Classifier with Hallucination Mitigation", func() {
 			cfg = &config.RouterConfig{}
 			cfg.HallucinationMitigation.Enabled = true
 			cfg.HallucinationMitigation.FactCheckModel.ModelID = "test-model"
-			cfg.HallucinationMitigation.FactCheckModel.MappingPath = "test-mapping.json"
 
 			classifier = &Classifier{Config: cfg}
 			Expect(classifier.IsFactCheckEnabled()).To(BeTrue())

src/semantic-router/pkg/config/config.go

@@ -526,9 +526,6 @@ type FactCheckModelConfig struct {
 
 	// Use CPU for inference
 	UseCPU bool `yaml:"use_cpu"`
-
-	// Path to fact-check label mapping file (JSON format)
-	MappingPath string `yaml:"mapping_path"`
 }
 
 // HallucinationModelConfig represents configuration for hallucination detection model

src/semantic-router/pkg/config/config_test.go

@@ -2426,7 +2426,6 @@ hallucination_mitigation:
     model_id: "models/fact_check_classifier"
     threshold: 0.75
     use_cpu: true
-    mapping_path: "config/hallucination/fact_check_mapping.json"
   hallucination_model:
     model_id: "models/hallucination_detect_modernbert"
     threshold: 0.6
@@ -2445,7 +2444,6 @@ hallucination_mitigation:
 				Expect(cfg.HallucinationMitigation.FactCheckModel.ModelID).To(Equal("models/fact_check_classifier"))
 				Expect(cfg.HallucinationMitigation.FactCheckModel.Threshold).To(Equal(float32(0.75)))
 				Expect(cfg.HallucinationMitigation.FactCheckModel.UseCPU).To(BeTrue())
-				Expect(cfg.HallucinationMitigation.FactCheckModel.MappingPath).To(Equal("config/hallucination/fact_check_mapping.json"))
 				Expect(cfg.HallucinationMitigation.HallucinationModel.ModelID).To(Equal("models/hallucination_detect_modernbert"))
 				Expect(cfg.HallucinationMitigation.HallucinationModel.Threshold).To(Equal(float32(0.6)))
 				Expect(cfg.HallucinationMitigation.HallucinationModel.UseCPU).To(BeTrue())
@@ -2544,7 +2542,6 @@ default_model: "test-model"
 			cfg := &RouterConfig{}
 			cfg.HallucinationMitigation.Enabled = true
 			cfg.HallucinationMitigation.FactCheckModel.ModelID = "models/fact_check"
-			cfg.HallucinationMitigation.FactCheckModel.MappingPath = "config/mapping.json"
 
 			Expect(cfg.IsFactCheckClassifierEnabled()).To(BeTrue())
 		})
@@ -2556,7 +2553,6 @@ default_model: "test-model"
 				{Name: "no_fact_check_needed", Description: "Query does not need fact verification"},
 			}
 			cfg.HallucinationMitigation.FactCheckModel.ModelID = "models/fact_check"
-			cfg.HallucinationMitigation.FactCheckModel.MappingPath = "config/mapping.json"
 
 			Expect(cfg.IsFactCheckClassifierEnabled()).To(BeTrue())
 		})
@@ -2565,23 +2561,13 @@ default_model: "test-model"
 			cfg := &RouterConfig{}
 			cfg.HallucinationMitigation.Enabled = false
 			cfg.HallucinationMitigation.FactCheckModel.ModelID = "models/fact_check"
-			cfg.HallucinationMitigation.FactCheckModel.MappingPath = "config/mapping.json"
 
 			Expect(cfg.IsFactCheckClassifierEnabled()).To(BeFalse())
 		})
 
 		It("should return false when model_id is missing", func() {
 			cfg := &RouterConfig{}
 			cfg.HallucinationMitigation.Enabled = true
-			cfg.HallucinationMitigation.FactCheckModel.MappingPath = "config/mapping.json"
-
-			Expect(cfg.IsFactCheckClassifierEnabled()).To(BeFalse())
-		})
-
-		It("should return false when mapping_path is missing", func() {
-			cfg := &RouterConfig{}
-			cfg.HallucinationMitigation.Enabled = true
-			cfg.HallucinationMitigation.FactCheckModel.ModelID = "models/fact_check"
 
 			Expect(cfg.IsFactCheckClassifierEnabled()).To(BeFalse())
 		})

src/semantic-router/pkg/config/helper.go

@@ -452,16 +452,14 @@ func (c *RouterConfig) IsFactCheckClassifierEnabled() bool {
 	// Check new fact_check_rules config first
 	if len(c.FactCheckRules) > 0 {
 		// For new signal config, still need the model from HallucinationMitigation
-		return c.HallucinationMitigation.FactCheckModel.ModelID != "" &&
-			c.HallucinationMitigation.FactCheckModel.MappingPath != ""
+		return c.HallucinationMitigation.FactCheckModel.ModelID != ""
 	}
 
 	// Fall back to legacy HallucinationMitigation config
 	if !c.HallucinationMitigation.Enabled {
 		return false
 	}
-	return c.HallucinationMitigation.FactCheckModel.ModelID != "" &&
-		c.HallucinationMitigation.FactCheckModel.MappingPath != ""
+	return c.HallucinationMitigation.FactCheckModel.ModelID != ""
 }
 
 // GetFactCheckRules returns all configured fact_check_rules