Add classifier testing framework for Banking Intent Model

This commit introduces a new Python module, classifier_tester.py, which provides a testing framework for evaluating the accuracy of classification models on intent classification tasks. The module includes methods for running tests on individual data points, reporting metrics, and visualizing confusion pairs, enhancing the overall testing capabilities for the Banking77 application.
2025-10-31 03:19:59 +01:00
parent 8368944a43
commit 3414454f43
1 changed files with 123 additions and 0 deletions
--- a/week6/community-contributions/hopeogbons/classifier_tester.py
+++ b/week6/community-contributions/hopeogbons/classifier_tester.py
@@ -0,0 +1,123 @@
+"""
+Classification Tester for Banking Intent Model
+Evaluates model accuracy on intent classification
+"""
+
+import matplotlib.pyplot as plt
+from collections import Counter
+from banking_intents import get_intent
+
+GREEN = "\033[92m"
+RED = "\033[91m"
+RESET = "\033[0m"
+
+
+class ClassifierTester:
+    """Test framework for classification models"""
+    
+    def __init__(self, predictor, data, title=None, size=100):
+        self.predictor = predictor
+        self.data = data
+        self.title = title or predictor.__name__.replace("_", " ").title()
+        self.size = min(size, len(data))
+        self.predictions = []
+        self.actuals = []
+        self.correct = 0
+        self.incorrect = 0
+    
+    def run_datapoint(self, i):
+        """Test a single example"""
+        item = self.data[i]
+        
+        # Get prediction
+        predicted_intent = self.predictor(item)
+        actual_intent = get_intent(item['label'])
+        
+        # Check if correct
+        is_correct = predicted_intent == actual_intent
+        
+        if is_correct:
+            self.correct += 1
+            color = GREEN
+            status = "✓"
+        else:
+            self.incorrect += 1
+            color = RED
+            status = "✗"
+        
+        self.predictions.append(predicted_intent)
+        self.actuals.append(actual_intent)
+        
+        # Print result
+        query = item['text'][:60] + "..." if len(item['text']) > 60 else item['text']
+        print(f"{color}{status} {i+1}: {query}")
+        print(f"   Predicted: {predicted_intent} | Actual: {actual_intent}{RESET}")
+    
+    def chart(self):
+        """Visualize top confusion pairs"""
+        # Find misclassifications
+        errors = {}
+        for pred, actual in zip(self.predictions, self.actuals):
+            if pred != actual:
+                pair = f"{actual} → {pred}"
+                errors[pair] = errors.get(pair, 0) + 1
+        
+        if not errors:
+            print("\n🎉 Perfect accuracy - no confusion to plot!")
+            return
+        
+        # Plot top 10 confusions
+        top_errors = sorted(errors.items(), key=lambda x: x[1], reverse=True)[:10]
+        
+        if top_errors:
+            labels = [pair for pair, _ in top_errors]
+            counts = [count for _, count in top_errors]
+            
+            plt.figure(figsize=(12, 6))
+            plt.barh(labels, counts, color='coral')
+            plt.xlabel('Count')
+            plt.title('Top 10 Confusion Pairs (Actual → Predicted)')
+            plt.tight_layout()
+            plt.show()
+    
+    def report(self):
+        """Print final metrics and chart"""
+        accuracy = (self.correct / self.size) * 100
+        
+        print("\n" + "="*70)
+        print(f"MODEL: {self.title}")
+        print(f"TESTED: {self.size} examples")
+        print(f"CORRECT: {self.correct} ({accuracy:.1f}%)")
+        print(f"INCORRECT: {self.incorrect}")
+        print("="*70)
+        
+        # Show most common errors
+        if self.incorrect > 0:
+            print("\nMost Common Errors:")
+            error_pairs = [(self.actuals[i], self.predictions[i]) 
+                          for i in range(len(self.actuals)) 
+                          if self.actuals[i] != self.predictions[i]]
+            error_counts = Counter(error_pairs).most_common(5)
+            
+            for (actual, pred), count in error_counts:
+                print(f"  {actual} → {pred}: {count} times")
+        
+        # Chart
+        self.chart()
+        
+        return accuracy
+    
+    def run(self):
+        """Run the complete evaluation"""
+        print(f"Testing {self.title} on {self.size} examples...\n")
+        
+        for i in range(self.size):
+            self.run_datapoint(i)
+        
+        return self.report()
+    
+    @classmethod
+    def test(cls, function, data, size=100):
+        """Convenience method to test a predictor function"""
+        return cls(function, data, size=size).run()
+