When plotting two (or more) subplots which share the same axes, I see large areas of white spaces within the plots as seen here:

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()
ax = fig.add_subplot(2, 1, 1)
ax.imshow(np.random.random((10,10)))
ax.autoscale(False)
ax2 = fig.add_subplot(2, 1, 2, sharex=ax, sharey=ax)
ax2.imshow(np.random.random((10,10)))
ax2.autoscale(False)
plt.show()

These white spaces persist even after autoscale(False), ax.set_xlim(0, 10), and/or ax.set_xbound(0, 10). One way to get rid of the white spaces is to set aspect=auto in imshow(), but this is not always ideal.
One could also set a figsize and manually adjust the axes to get the image contained exactly within the figure without white spaces, but resizing the figure would make the white spaces appear again.

Is there a way to correct for this behaviour?