//  [python]
def plan(self, om, Nd, Kd, Jd, ft_axes = None, batch = None):
        """
        Design the min-max interpolator.
         
        :param om: The M off-grid locations in the frequency domain. Normalized between [-pi, pi]
        :param Nd: The matrix size of equispaced image. Example: Nd=(256,256) for a 2D image; Nd = (128,128,128) for a 3D image
        :param Kd: The matrix size of the oversampled frequency grid. Example: Kd=(512,512) for 2D image; Kd = (256,256,256) for a 3D image
        :param Jd: The interpolator size. Example: Jd=(6,6) for 2D image; Jd = (6,6,6) for a 3D image
        :type om: numpy.float array, matrix size = M * ndims
        :type Nd: tuple, ndims integer elements. 
        :type Kd: tuple, ndims integer elements. 
        :type Jd: tuple, ndims integer elements. 
        :returns: 0
        :rtype: int, float
        :Example:
 
        >>> import pynufft
        >>> NufftObj = pynufft.NUFFT_cpu()
        >>> NufftObj.plan(om, Nd, Kd, Jd) 
         
        """         
         
 
#         n_shift = tuple(0*x for x in Nd)
        self.ndims = len(Nd) # dimension
        self.scale_gamma = numpy.multiply.reduce(Kd)/numpy.multiply.reduce(Nd)
        if ft_axes is None:
            ft_axes = range(0, self.ndims)
        self.ft_axes = ft_axes
#     
        self.st = helper.plan(om, Nd, Kd, Jd, ft_axes = ft_axes, format = 'CSR')

        self.Nd = self.st['Nd']  # backup
        self.Kd = self.st['Kd']
        self.sn = numpy.asarray(self.st['sn'].astype(self.dtype)  ,order='C')# backup
        if batch is None:
            self.parallel_flag = 0
        else:
            self.parallel_flag = 1
             
        if batch is None:
            self.batch = numpy.uint32(1)
#             self.nobatch = 1
        else:
            self.batch = numpy.uint32(batch)
  
        self.Nd = self.st['Nd']  # backup
        self.Kd = self.st['Kd']
        self.sn = numpy.asarray(self.st['sn'].astype(self.dtype)  ,order='C')# backup
         
        if self.batch == 1 and (self.parallel_flag == 0):
            self.multi_Nd =   self.Nd
            self.multi_Kd =   self.Kd
            self.multi_M =   (self.st['M'], )      
#             self.sense2 = self.sense*numpy.reshape(self.sn, self.Nd + (1, )) # broadcasting the sense and scaling factor (Roll-off)
        else: #self.batch is 0:
            self.multi_Nd =   self.Nd + (self.batch, )
            self.multi_Kd =   self.Kd + (self.batch, )
            self.multi_M =   (self.st['M'], )+ (self.batch, )         
        # Calculate the density compensation function
        self.sp = self.st['p'].copy().tocsr()
        self.spH = (self.st['p'].getH().copy()).tocsr()        
        self.Kdprod = numpy.int32(numpy.multiply.reduce(self.st['Kd']))
        self.Jdprod = numpy.int32(numpy.multiply.reduce(self.st['Jd']))
        del self.st['p'], self.st['sn']
#         self._precompute_sp()        
#         del self.st['p0'] 
        self.NdCPUorder, self.KdCPUorder, self.nelem =     helper.preindex_copy(self.st['Nd'], self.st['Kd'])
#         self.Nd_elements, self.Kd_elements, self.invNd_elements = helper.preindex_copy2(self.st['Nd'], self.st['Kd'])
        self.Nd_elements,  self.invNd_elements = helper.strides_divide_itemsize(self.st['Nd'])
        self.Kd_elements = helper.strides_divide_itemsize( self.st['Kd'])[0] # only return the Kd_elements
        self.offload()
         
        return 0