code: def reduced_dim(dim, subsampling, border):
      return max(
          1, int(np.ceil((dim - 2 * border) / float(subsampling)))
      )
  
imports: import warnings
  import nibabel
  import numpy
  import pytest
  from nibabel import io_orientation
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from ....None import load_image
  from ....core.image.image_spaces import make_xyz_image, xyz_affine
  from ....io.nibcompat import get_header
  from ....testing import funcfile
  from ...slicetiming.timefuncs import st_02413, st_42031, st_43210
  from ..affine import Rigid
  from ..groupwise_registration import FmriRealign4d, Image4d, Realign4d, Realign4dAlgorithm, SpaceRealign, SpaceTimeRealign, make_grid, resample4d
label_desc: Use image node_id 16 for calling a global function with example usage: reduced_dim(dim, subsampling, border) and returns: max