code: def pack_bin(in1):
      """
      Pack binary arrary.
      Data will be packed with little endian for NVIDIA GPU compatibility.
  
      Parameters
      ----------
      in1 : ndarray
          The ndarray to be pack at binary.
  
      Returns
      -------
      out : ndarray
          An 1-dimensional array containing packed binary data.
  
      """
  
      out = _pack(in1)
  
      return out
  
imports: import cupy
  from ._writer_cuda import _pack
label_desc: Use image node_id 2 for calling a global function with example usage: pack_bin(in1) and returns: out