Change titles in axis

utils.py

@@ -159,8 +159,8 @@ def dataframe_to_pianoroll_img(df):
     ax.scatter(df.start_time, df.pitch, c="white")
     for _, row in df.iterrows():
         ax.add_patch(Rectangle((row["start_time"], row["pitch"]-0.4), row["duration"], 0.4, color="black"))
-    plt.xlabel('Seconds', fontsize=18)
-    plt.ylabel('MIDI pitch', fontsize=16)
+    plt.xlabel('time (sec.)', fontsize=18)
+    plt.ylabel('pitch (MIDI)', fontsize=16)
     return fig
 
 def fig2img(fig):