Update app.py

app.py

@@ -105,7 +105,7 @@ def evaluate(
     no_gt: bool = False,
 ):
     pass_k = [int(k.strip()) for k in pass_k.split(',') if k.strip().isdigit()]
-    if not parallel:
+    if parallel < 1:
         n_workers = max(1, multiprocessing.cpu_count() // 2)
     else:
         n_workers = parallel