Question

我有一个形状为(3, 64, 64)的图片列表，读取它们并将它们存储在列表images中。然后我将堆栈应用到List：

images = np.stack(images)

我收到了这个错误：

 File "/usr/local/lib/python2.7/dist-packages/numpy/core/shape_base.py", line 350, in stack
raise ValueError('need at least one array to stack')
ValueError: need at least one array to stack'

我将很感激有任何人对此有所了解。

Answer 1

我可以通过以下方式重现您的错误：

In [94]: images=[]
In [95]: np.stack(images)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-95-adab3e1812bc> in <module>()
----> 1 np.stack(images)

/usr/local/lib/python3.5/dist-packages/numpy/core/shape_base.py in stack(arrays, axis, out)
    347     arrays = [asanyarray(arr) for arr in arrays]
    348     if not arrays:
--> 349         raise ValueError('need at least one array to stack')
    350 
    351     shapes = set(arr.shape for arr in arrays)

ValueError: need at least one array to stack

它会引发错误，因为这是True：

In [97]: not images
Out[97]: True

ndarray的Numpy堆栈列表

1 个答案: