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ValueError: zero-size array to reduction operation minimum which has no identity

I tried to save my cropped images using matplotlib, but I get an error like this

File "tools/script.py", line 165, in main
    out_when_no_box=args.out_when_no_box
  File "/home/user/project/vis.py", line 99, in vis_one_image
    plt.imsave('/home/user/data/masks/' + file_name + '_' + str(i) + '.png', crop_mask)
  File "/home/user/.local/lib/python3.5/site-packages/matplotlib/pyplot.py", line 2157, in imsave
    return matplotlib.image.imsave(fname, arr, **kwargs)
  File "/home/user/.local/lib/python3.5/site-packages/matplotlib/image.py", line 1418, in imsave
    image.set_data(arr)
  File "/home/user/.local/lib/python3.5/site-packages/matplotlib/image.py", line 646, in set_data
    if self._A.min() < 0 or high < self._A.max():
  File "/home/user/.local/lib/python3.5/site-packages/numpy/ma/core.py", line 5641, in min
    axis=axis, out=out, **kwargs).view(type(self))
  File "/home/user/.local/lib/python3.5/site-packages/numpy/core/_methods.py", line 34, in _amin
    return umr_minimum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation minimum which has no identit
matplotlibsave-image
3 votesLP218.00
1 Answers
JO246.00
2

It's because of your cropped image. it is an empty array or has an empty dimention. Take a look at the shapes of them. You can't save an empty array as an image.

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