code: def _stack_arrs(arrs, use_shared_mem=False):
      """Internal imple for stacking arrays."""
      if isinstance(arrs[0], mx.nd.NDArray):
          if use_shared_mem:
              out = mx.nd.empty(
                  (len(arrs),) + arrs[0].shape,
                  dtype=arrs[0].dtype,
                  ctx=mx.Context("cpu_shared", 0),
              )
              return mx.nd.stack(*arrs, out=out)
          else:
              return mx.nd.stack(*arrs)
      else:
          out = np.asarray(arrs)
          if use_shared_mem:
              return mx.nd.array(out, ctx=mx.Context("cpu_shared", 0))
          else:
              return mx.nd.array(out)
  
imports: import logging
  import numpy
  import mxnet
label_desc: Use image node_id 2 for calling a global function with example usage: _stack_arrs(arrs, use_shared_mem) and returns: mx, mx, mx, mx