# normal plot
fig, ax1 = plt.subplots(figsize = (10, 8))
ax1.bar([1, 2, 3], [1, 2, 3], color = 'black')
ax1.set_ylabel('ylabel', fontsize = 20)
plt.suptitle('subplots fontsize=20', fontsize = 20)
plt.title('subplots fontsize=10', fontsize = 10)
plt.show()

# host_subplot
ax2 = host_subplot(111, axes_class=axisartist.Axes)
ax2.figure.set_size_inches((10, 8))
ax2.bar([1, 2, 3], [1, 2, 3], color = 'black')
ax2.set_ylabel('ylabel', fontsize = 20) # this code does not work
# ax2.axis['left'].label.set_fontsize(20) # this code works
plt.suptitle('host_subplot fontsize=20', fontsize = 20)
plt.title('host_subplot fontsize=10', fontsize = 10)
plt.show()

ax2.set_ylabel('ylabel', fontsize = 20) # this code does not work
# ax2.axis['left'].label.set_fontsize(20) # this code works