Update app.py

app.py

@@ -8,11 +8,11 @@ manages the application lifecycle including initialization and cleanup.
 
 import streamlit as st
 import time
-import json
 import os
 import logging
 import atexit
-import sys
+import ast
+import re
 from pathlib import Path
 
 # Configure logging first, before other imports
@@ -29,14 +29,10 @@ if not os.environ.get("OPENAI_API_KEY"):
     
 # Import our modules
 from utils.models import initialize_models
-from utils.performance import PerformanceTracker
 
 # Import agent functionality
 import agent
 
-# Initialize performance tracker
-performance_tracker = PerformanceTracker()
-
 # Ensure data directory exists
 data_dir = Path("data")
 if not data_dir.exists():
@@ -252,7 +248,7 @@ st.markdown("### Enter a claim to verify")
 def on_input_change():
     st.session_state.input_content = st.session_state.claim_input_area
 
-# Input area with callback - key fix here!
+# Input area with callback
 claim_input = st.text_area("", 
                          value=st.session_state.input_content,
                          height=100,
@@ -473,7 +469,6 @@ else:
                 if isinstance(evidence, str):
                     # Try to parse string as a list
                     try:
-                        import ast
                         parsed_evidence = ast.literal_eval(evidence)
                         if isinstance(parsed_evidence, list):
                             evidence = parsed_evidence
@@ -519,7 +514,7 @@ else:
                     
                     # Only show evidence tabs if we have evidence
                     if evidence and any(ev for ev in evidence if ev):
-                        # Create tabs for supporting and contradicting evidence only (removed All Evidence tab)
+                        # Create tabs for supporting and contradicting evidence only
                         evidence_tabs = st.tabs(["Supporting Evidence", "Contradicting Evidence", "Source Details"])
                         
                         # Supporting Evidence tab
@@ -564,12 +559,10 @@ else:
                                 source = "Unknown"
                                 # Extract source info from evidence text
                                 if "URL:" in ev:
-                                    import re
                                     url_match = re.search(r'URL: https?://(?:www\.)?([^/]+)', ev)
                                     if url_match:
                                         source = url_match.group(1)
                                 elif "Source:" in ev:
-                                    import re
                                     source_match = re.search(r'Source: ([^,]+)', ev)
                                     if source_match:
                                         source = source_match.group(1)