classifier.py 文件源码

def _slice_cube(cube):
    """Creates 2D slices from a 3D volume.

    Args:
        cube: a [N x N x N] numpy array

    Returns:
        slices: a [N x N x 9] array of 2D slices
    """

    slices = np.zeros((cube.shape[0], cube.shape[0], 9), dtype=np.float32)

    # axis-aligned
    slices[:,:,0] = cube[np.floor(cube.shape[0] / 2).astype(int), :, :]
    slices[:,:,1] = cube[:, np.floor(cube.shape[0] / 2).astype(int), :]
    slices[:,:,2] = cube[:, :, np.floor(cube.shape[0] / 2).astype(int)]

    # diagonals
    slices[:,:,3] = cube.diagonal(axis1=0, axis2=1)
    slices[:,:,4] = cube.diagonal(axis1=0, axis2=2)
    slices[:,:,5] = cube.diagonal(axis1=1, axis2=2)
    slices[:,:,6] = np.flip(cube, 0).diagonal(axis1=0, axis2=1)
    slices[:,:,7] = np.flip(cube, 0).diagonal(axis1=0, axis2=2)
    slices[:,:,8] = np.flip(cube, 1).diagonal(axis1=1, axis2=2)

    return slices