Hi ptrblck,
I tried, but now I am getting below error.
RuntimeError: function L1PenaltyBackward returned an incorrect number of gradients (expected 2, got 1)
Colab link

  
      github.com
  
  
    subhobrata/deep-learning-for-visual-computing/blob/master/Lecture_19_2.ipynb 4
{
  "nbformat": 4,
  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "name": "Lecture 19_2.ipynb",
      "version": "0.3.2",
      "provenance": [],
      "include_colab_link": true
    },
    "kernelspec": {
      "name": "python2",
      "display_name": "Python 2"
    },
    "accelerator": "GPU"
  },
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {


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Thanks and Regards,
Subho