diff --git a/examples/parallel_example.ipynb b/examples/parallel_example.ipynb
index 039767c..5d1b365 100644
--- a/examples/parallel_example.ipynb
+++ b/examples/parallel_example.ipynb
@@ -105,7 +105,6 @@
     "from concurrent.futures import ProcessPoolExecutor, as_completed\n",
     "\n",
     "futures = []\n",
-    "NUM_COPIES=20\n",
     "\n",
     "with ProcessPoolExecutor(max_workers=NUM_PROCESS, initializer=init_model, initargs=(model,)) as ex:\n",
     "    for i in range(NUM_COPIES):\n",