code: def masked_select(input, mask):
      assert False, "masked select for MXNet is not implemented"
  
imports: import os
  import numpy
  import mxnet
  from mxnet import gluon
  from mxnet import ndarray
  from .score_fun import *
  from ..None import *
label_desc: Use image node_id 3 for calling a global function with example usage: masked_select(input, mask) without return types