Update app.py

app.py

@@ -1,7 +1,6 @@
 import gradio as gr
 import json
 from graphviz import Digraph
-import io
 import base64
 
 def generate_concept_map(json_input: str) -> str:
@@ -125,9 +124,37 @@ def generate_concept_map(json_input: str) -> str:
         return f"Error: {str(e)}"
 
 if __name__ == "__main__":
+    # Sample JSON for placeholder
+    sample_json = """
+    {
+      "central_node": "Artificial Intelligence (AI)",
+      "nodes": [
+        {
+          "id": "ml",
+          "label": "Machine Learning",
+          "relationship": "core_component",
+          "subnodes": [
+            {"id": "sl", "label": "Supervised Learning", "relationship": "type_of"},
+            {"id": "ul", "label": "Unsupervised Learning", "relationship": "type_of"}
+          ]
+        },
+        {
+          "id": "nlp",
+          "label": "Natural Language Processing",
+          "relationship": "application_area",
+          "subnodes": [
+            {"id": "sa", "label": "Sentiment Analysis", "relationship": "technique"},
+            {"id": "tr", "label": "Translation", "relationship": "technique"}
+          ]
+        }
+      ]
+    }
+    """
+    
     demo = gr.Interface(
         fn=generate_concept_map,
         inputs=gr.Textbox(
+            value=sample_json,  # Pre-filled sample JSON
             placeholder="Paste structured JSON here...",
             label="JSON Input",
             lines=15