Update colab gym render installation + leaderboard link

unit1/unit1.ipynb

@@ -3,8 +3,8 @@
     {
       "cell_type": "markdown",
       "metadata": {
-        "colab_type": "text",
-        "id": "view-in-github"
+        "id": "view-in-github",
+        "colab_type": "text"
       },
       "source": [
         "<a href=\"https://colab.research.google.com/github/huggingface/deep-rl-class/blob/main/unit1/unit1.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
@@ -776,7 +776,7 @@
         "- You can **showcase our work** 🔥\n",
         "- You can **visualize your agent playing** 👀\n",
         "- You can **share with the community an agent that others can use** 💾\n",
-        "- You can **access a leaderboard 🏆 to see how well your agent is performing compared to your classmates** 👉 https://huggingface.co/spaces/ThomasSimonini/Lunar-Lander-Leaderboard\n"
+        "- You can **access a leaderboard 🏆 to see how well your agent is performing compared to your classmates** 👉 https://huggingface.co/spaces/huggingface-projects/Deep-Reinforcement-Learning-Leaderboard\n"
       ]
     },
     {
@@ -973,7 +973,7 @@
         "\n",
         "Under the hood, the Hub uses git-based repositories (don't worry if you don't know what git is), which means you can update the model with new versions as you experiment and improve your agent.\n",
         "\n",
-        "Compare the results of your LunarLander-v2 with your classmates using the leaderboard 🏆 👉 https://huggingface.co/spaces/ThomasSimonini/Lunar-Lander-Leaderboard"
+        "Compare the results of your LunarLander-v2 with your classmates using the leaderboard 🏆 👉 https://huggingface.co/spaces/huggingface-projects/Deep-Reinforcement-Learning-Leaderboard"
       ]
     },
     {
@@ -1063,9 +1063,29 @@
       "source": [
         "!pip install gym pyvirtualdisplay > /dev/null 2>&1\n",
         "!apt-get install -y xvfb python-opengl ffmpeg > /dev/null 2>&1\n",
-        "!pip install colabgymrender==1.0.2"
+        "!pip install -U colabgymrender"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "If you have a runtime bug `RuntimeError: imageio.ffmpeg.download() has been deprecated. Use 'pip install imageio-ffmpeg' instead.'` here please install this package and click on restart button after the installation"
+      ],
+      "metadata": {
+        "id": "XAq_Fosen9Z7"
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "!pip install imageio==2.4.1"
+      ],
+      "metadata": {
+        "id": "3wmUjb5LoCiK"
+      },
+      "execution_count": null,
+      "outputs": []
+    },
     {
       "cell_type": "code",
       "execution_count": null,
@@ -1157,10 +1177,10 @@
     "accelerator": "GPU",
     "colab": {
       "collapsed_sections": [],
-      "include_colab_link": true,
       "name": "Copie de Unit 1: Train your first Deep Reinforcement Learning Agent 🚀.ipynb",
       "private_outputs": true,
-      "provenance": []
+      "provenance": [],
+      "include_colab_link": true
     },
     "gpuClass": "standard",
     "kernelspec": {
@@ -1173,4 +1193,4 @@
   },
   "nbformat": 4,
   "nbformat_minor": 0
-}
+}