Add CSS4 list of color to avoid index out of rande

utils.py

@@ -1,5 +1,6 @@
 
 import collections
+import random
 
 import pandas as pd
 import matplotlib.pyplot as plt
@@ -30,7 +31,8 @@ def dataframe_to_pianoroll_img(df):
     fig = plt.figure(figsize=(8, 5))
     ax = fig.add_subplot(111)
     ax.scatter(df.start_time, df.pitch, c="white")
-    colors = [mcolors.TABLEAU_COLORS[name] for i, name in enumerate(list(mcolors.TABLEAU_COLORS))]
+    colors = [mcolors.CSS4_COLORS[name] for i, name in enumerate(list(mcolors.CSS4_COLORS))]
+    random.shuffle(colors)
     colordict = {inst: colors[i] for i, inst in enumerate(df["instrument"].unique())}
     for _, row in df.iterrows():
         ax.add_patch(Rectangle((row["start_time"],