ShapeUtil.py 文件源码

def as3D(x):
    """ Convert input into to 3D numpy array.

    Returns
    -------
    x : 3D array

    Examples
    -------
    >>> as3D(5)
    array([[[5]]])
    >>> as3D([1,2,3])
    array([[[1, 2, 3]]])
    >>> as3D([[3,4,5,6]])
    array([[[3, 4, 5, 6]]])
    """
    if not isinstance(x, np.ndarray):
        x = np.asarray_chkfinite(x)
    if x.ndim < 1:
        x = np.asarray_chkfinite([x])
    while x.ndim < 3:
        x = x[np.newaxis, :]
    return x