add explicit UTF-8 encoding

scripts/base_eval.py

@@ -59,7 +59,7 @@ def evaluate_model(model, tokenizer, device, max_per_task=-1):
     config_path = os.path.join(eval_bundle_dir, "core.yaml")
     data_base_path = os.path.join(eval_bundle_dir, "eval_data")
     eval_meta_data = os.path.join(eval_bundle_dir, "eval_meta_data.csv")
-    with open(config_path, 'r') as f:
+    with open(config_path, 'r', encoding='utf-8') as f:
         config = yaml.safe_load(f)
     tasks = config['icl_tasks']
 
@@ -193,7 +193,7 @@ def main():
         print0("="*80)
         print0(f"Model: {model_name}")
         print0("="*80)
-        with open(output_csv_path, 'r') as f:
+        with open(output_csv_path, 'r', encoding='utf-8') as f:
             print0(f.read())
 
     # Log to report

scripts/chat_web.py

@@ -243,7 +243,7 @@ app.add_middleware(
 async def root():
     """Serve the chat UI."""
     ui_html_path = os.path.join("nanochat", "ui.html")
-    with open(ui_html_path, "r") as f:
+    with open(ui_html_path, "r", encoding='utf-8') as f:
         html_content = f.read()
     # Replace the API_URL to use the same origin
     html_content = html_content.replace(