diff --git a/NetBone/Statistical/maxent_graph/util.py b/netbone/statistical/maxent_graph/util.py
similarity index 99%
rename from NetBone/Statistical/maxent_graph/util.py
rename to netbone/statistical/maxent_graph/util.py
index 2775215c03d2356aecd2b7ebc211521f5c740b07..0348e0c1aea9d250549a449cbf83f70c3877a510 100644
--- a/NetBone/Statistical/maxent_graph/util.py
+++ b/netbone/statistical/maxent_graph/util.py
@@ -10,7 +10,6 @@ from networkx.algorithms import bipartite
 from tabulate import tabulate
 from functools import partial
 from jax import jvp, grad, jit
-import math
 
 
 EPS = np.finfo(float).eps
diff --git a/NetBone/Visualize.py b/netbone/visualize.py
similarity index 99%
rename from NetBone/Visualize.py
rename to netbone/visualize.py
index 5676bf8845f987f2ea636ba7ae3a33a80f80ce19..58ebe578b5f63b871c8eafc5426376c94124f0dd 100644
--- a/NetBone/Visualize.py
+++ b/netbone/visualize.py
@@ -1,7 +1,6 @@
 import numpy as np
 import matplotlib.pyplot as plt
 import textwrap
-import math
 import seaborn as sns
 
 colors = ['#000000', '#4c72b0', '#dd8452', '#55a868', '#c44e52', '#8172b3', '#937860', '#da8bc3', '#8c8c8c']