code: def backward(self, req, out_grad, in_data, out_data, in_grad, aux):
      return
  
file_path: gluonts/src/gluonts/mx/representation/binning_helpers.py
imports: import mxnet
  import numpy
label_desc: Use image node_id 2 for calling the Digitize obj's underlying member method code with example usage: obj.backward(req, out_grad, in_data, out_data, in_grad, aux) without return types