python - matplotlib imshow interpolation grey edges -

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I am using imshow to generate heat maps for a relatively sparse matrix, but when I use interpolation My code is for this chart / s 

  plt.imshow (data [, start:], cm = space, interpolation = 'none', aspect = 'auto' , Ideal = ideal, original = 'bottom') plt.plot (np.array (category (lane (x_labels)), ave_time, color = 'g', alpha = 0.3, lw = 1)

Do not stop gray edges Is there any way?

= none with launch interpolation = with no

with the launch = spline36 projection = spline36

OK, get it out of understanding

cmap.set_bad ('w', 1.)

added a bad data element

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