code: def pack_int4_to_int8(weight):
      assert weight.dim() == 2
      assert weight.shape[1] % 2 == 0
      assert weight.dtype == torch.int8
      return ((weight[:, 1::2] & 0xF) << 4) | (weight[:, 0::2] & 0xF)
  
label_desc: Use image node_id 1 for calling a global function with example usage: pack_int4_to_int8(weight) and returns: unknown