fix run_gpt2.py

examples/run_gpt2.py

@@ -83,7 +83,8 @@ def run_model():
     elif args.length > model.config.n_ctx:
         raise ValueError("Can't get samples longer than window size: %s" % model.config.n_ctx)
 
-    while not args.unconditional:
+    while True:
+        context_tokens = []
         if not args.unconditional:
             raw_text = input("Model prompt >>> ")
             while not raw_text:
@@ -106,6 +107,8 @@ def run_model():
                 print("=" * 40 + " SAMPLE " + str(generated) + " " + "=" * 40)
                 print(text)
         print("=" * 80)
+        if args.unconditional:
+            break
 
 if __name__ == '__main__':
     run_model()