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python object reference

Posted on Edited on In Valine:

Python function object reference导致的bug

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imsave('./generated_inputs/' +str(iters) +'_0'+str(i)+ '_two.png', deprocess_image(imgs[0]))

def deprocess_image(x):
    tmp = x
    tmp = tmp.reshape((100, 100, 3))
    # Remove zero-center by mean pixel
    tmp[:, :, 0] += 103.939
    tmp[:, :, 1] += 116.779
    tmp[:, :, 2] += 123.68
    # 'BGR'->'RGB'
    tmp = tmp[:, :, ::-1]
    tmp = np.clip(tmp, 0, 255).astype('uint8')
    return tmp
// 如此添加tmp。x的值仍会一直改变。则重复调用deprocess无法得到相同结果。
// 正确做法 使用x.copy()
def deprocess_image(x):
    tmp = x.copy()
    tmp = tmp.reshape((100, 100, 3))
    # Remove zero-center by mean pixel
    tmp[:, :, 0] += 103.939
    tmp[:, :, 1] += 116.779
    tmp[:, :, 2] += 123.68
    # 'BGR'->'RGB'
    tmp = tmp[:, :, ::-1]
    tmp = np.clip(tmp, 0, 255).astype('uint8')
    return tmp