feat: add leaderboard for top contributors

app.py

@@ -113,6 +113,21 @@ class OCRDataCollector:
     def skip_text(self, text_block, username: Optional[str] = None):
         return self.get_random_text_block(201)
 
+    def get_leaderboard(self):
+        try:
+            dataset = datasets.load_dataset("rawwerks/handwriting-ocr-all", split="train")
+            # Count contributions by non-anonymous users
+            user_counts = {}
+            for item in dataset:
+                if item['user'] != 'anonymous':
+                    user_counts[item['user']] = user_counts.get(item['user'], 0) + 1
+            
+            # Sort by count (descending) and format for display
+            leaderboard = sorted(user_counts.items(), key=lambda x: x[1], reverse=True)
+            return [(f"🏆 {i+1}. {user}", count) for i, (user, count) in enumerate(leaderboard)]
+        except Exception as e:
+            print(f"Error fetching leaderboard: {e}")
+            return []
 
 def strip_metadata(image: Image.Image) -> Image.Image:
     """
@@ -144,6 +159,20 @@ def create_gradio_interface():
     with gr.Blocks() as demo:
         gr.Markdown("# Handwriting OCR Dataset Creator")
         gr.Markdown("## After almost 100 years, handwriting recognition still sucks. Together, we can change that.")
+        
+        # Add leaderboard section at the top
+        with gr.Row():
+            with gr.Column():
+                gr.Markdown("### 🏆 Top Contributors")
+                leaderboard = gr.Dataframe(
+                    headers=["User", "Contributions"],
+                    value=collector.get_leaderboard(),
+                    elem_id="leaderboard",
+                    visible=True,
+                    interactive=False
+                )
+                refresh_btn = gr.Button("🔄 Refresh Leaderboard", elem_id="refresh_btn")
+
         gr.Markdown("### Step 1: Log in with your Hugging Face account to use this app.")
         # Login section - centered
         with gr.Row():
@@ -394,7 +423,7 @@ def create_gradio_interface():
             os.remove(temp_path_private)
 
             new_text = collector.get_random_text_block(max_words)
-            return None, new_text
+            return None, new_text, collector.get_leaderboard()
 
         # Submit button click handler with simplified inputs
         submit_btn.click(
@@ -409,7 +438,7 @@ def create_gradio_interface():
                 gr.State(None),    # Profile will be filled by Gradio
                 gr.State(None)     # Token will be filled by Gradio
             ],
-            outputs=[image_input, text_box]
+            outputs=[image_input, text_box, leaderboard]
         )
 
         def handle_regenerate(text, max_words):
@@ -422,6 +451,16 @@ def create_gradio_interface():
             outputs=text_box
         )
 
+        # Add leaderboard refresh handler
+        def refresh_leaderboard():
+            return collector.get_leaderboard()
+        
+        refresh_btn.click(
+            fn=refresh_leaderboard,
+            inputs=[],
+            outputs=[leaderboard]
+        )
+
     return demo
 
 if __name__ == "__main__":