def d_f(arr,ratio=1):
n=len(arr)
rows=int(np.ceil(n/10))
cols = n if rows<2 else 10
fg,ax =plt.subplots(rows,cols,figsize=(cols*ratio,rows*ratio),squeeze=False)
for i in range(rows):
for j in range(cols):
if i*10+j<n:
ax[i,j].imshow(arr[i*10+j],cmap='gray_r')
ax[i,j].axis('off')
plt.show()