code: def fsl2antstransform(matrix, reference, moving):
      
      if reference.dimension != 3:
          raise ValueError('reference image must be 3 dimensions')
  
      if reference.pixeltype != 'float':
          reference = reference.clone('float')
      if moving.pixeltype != 'float':
          moving = moving.clone('float')
  
      libfn = utils.get_lib_fn('fsl2antstransformF3')
      tx_ptr = libfn(list(matrix), 
                      reference.pointer,
                      moving.pointer,
                      1)
  
      return tio.ANTsTransform(precision='float', dimension=reference.dimension, 
                               transform_type='AffineTransform', pointer=tx_ptr)
docs: Convert an FSL linear transform to an antsrTransform
      
      ANTsR function: `fsl2antsrtransform`
  
      Arguments
      ---------
      matrix : ndarray/list
          4x4 matrix of transform parameters
  
      reference : ANTsImage
          target image
  
      moving : ANTsImage
          moving image
  
      Returns
      -------
      ANTsTransform
  
      Examples
      --------
      >>> import ants
      >>> import numpy as np
      >>> fslmat = np.zeros((4,4))
      >>> np.fill_diagonal(fslmat, 1)
      >>> img = ants.image_read(ants.get_ants_data('ch2'))
      >>> tx = ants.fsl2antstransform(fslmat, img, img)