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grid_data=d.iloc[index].as_matrix( ).reshape(28,28) not working

# display or plot a number.
plt.figure(figsize=(7,7))
idx = 100

grid_data = d.iloc[idx].as_matrix().reshape(28,28) # reshape from 1d to 2d pixel array
plt.imshow(grid_data, interpolation = "none", cmap = "gray")
plt.show()

print(l[idx])
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