diff --git a/lang/zh/gklearn/experiments/papers/PRL_2020/synthesized_graphs_num_nodes.py b/lang/zh/gklearn/experiments/papers/PRL_2020/synthesized_graphs_num_nodes.py
index ec6557c..f63c404 100644
--- a/lang/zh/gklearn/experiments/papers/PRL_2020/synthesized_graphs_num_nodes.py
+++ b/lang/zh/gklearn/experiments/papers/PRL_2020/synthesized_graphs_num_nodes.py
@@ -42,7 +42,7 @@ def xp_synthesized_graphs_num_nodes():
 			# Compute Gram matrix.
 			run_time = 'error'
 			try:
-				gram_matrix, run_time = compute_graph_kernel(graphs, kernel_name, n_jobs=1)
+				gram_matrix, run_time = compute_graph_kernel(graphs, kernel_name)
 			except Exception as exp:
 				run_times[kernel_name].append('error')
 				print('An exception occured when running this experiment:')