01_taxi/notebooks/01_random_agent_baseline.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "4c2ff31f",
   "metadata": {},
   "source": [
    "# 01 Random agent baseline"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ba09a498",
   "metadata": {},
   "source": [
    "#### 👉Before you try to solve a Reinforcement Learning problem you should get a grasp of its difficulty.\n",
    "\n",
    "#### 👉 To do so, you need to design a dummy agent that can peform the task without much brains, and evaluate its performance.\n",
    "\n",
    "#### 👉A simple way to do so is by using a Random Agent, that chooses its next action randomly, without paying attention at the current state of the environment.\n",
    "\n",
    "#### 👉Needless to say, do not grab a taxi driven by a Random Driver."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "e3629346",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Populating the interactive namespace from numpy and matplotlib\n"
     ]
    }
   ],
   "source": [
    "%load_ext autoreload\n",
    "%autoreload 2\n",
    "%pylab inline\n",
    "%config InlineBackend.figure_format = 'svg'"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "76e9a06d",
   "metadata": {},
   "source": [
    "## Environment 🌎"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "ebfba291",
   "metadata": {},
   "outputs": [],
   "source": [
    "import gym\n",
    "env = gym.make(\"Taxi-v3\").env"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "52a806a2",
   "metadata": {},
   "source": [
    "## Random agent 🤖🍷"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "a44f5647",
   "metadata": {},
   "outputs": [],
   "source": [
    "class RandomAgent:\n",
    "    \"\"\"\n",
    "    This taxi driver selects actions randomly.\n",
    "    You better not get into this taxi!\n",
    "    \"\"\"\n",
    "    def __init__(self, env):\n",
    "        self.env = env\n",
    "\n",
    "    def get_action(self, state) -> int:\n",
    "        \"\"\"\n",
    "        We have `state` as an input to keep\n",
    "        a consistent API for all our agents, but it\n",
    "        is not used.\n",
    "        \n",
    "        i.e. The agent does not consider the state of\n",
    "        the environment when deciding what to do next.\n",
    "        This is why we call it \"random\".\n",
    "        \"\"\"\n",
    "        return self.env.action_space.sample()\n",
    "\n",
    "agent = RandomAgent(env)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "be5af56b",
   "metadata": {},
   "source": [
    "## Let's evaluate this driver starting from a fixed `state = 123`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "52c11f92",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Timesteps taken: 1420\n",
      "Penalties incurred: 466\n"
     ]
    }
   ],
   "source": [
    "# set initial state of the environment\n",
    "env.reset()\n",
    "state = 123\n",
    "env.s = state\n",
    "\n",
    "epochs = 0\n",
    "penalties = 0  # wrong pick up or dropp off\n",
    "reward = 0\n",
    "\n",
    "# store frames to latter plot them\n",
    "frames = []\n",
    "\n",
    "done = False\n",
    "\n",
    "while not done:\n",
    "    \n",
    "    action = agent.get_action(state)\n",
    "    \n",
    "    state, reward, done, info = env.step(action)\n",
    "\n",
    "    if reward == -10:\n",
    "        penalties += 1\n",
    "    \n",
    "    frames.append({\n",
    "        'frame': env.render(mode='ansi'),\n",
    "        'state': state,\n",
    "        'action': action,\n",
    "        'reward': reward\n",
    "        }\n",
    "    )\n",
    "\n",
    "    epochs += 1\n",
    "    \n",
    "    \n",
    "print(\"Timesteps taken: {}\".format(epochs))\n",
    "print(\"Penalties incurred: {}\".format(penalties))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "dbeebb90",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "+---------+\n",
      "|R: | : :G|\n",
      "| : | : : |\n",
      "| : : : : |\n",
      "| | : | : |\n",
      "|Y| : |\u001b[35m\u001b[34;1m\u001b[43mB\u001b[0m\u001b[0m\u001b[0m: |\n",
      "+---------+\n",
      "  (Dropoff)\n",
      "\n",
      "Timestep: 1420 of 1420\n",
      "State: 475\n",
      "Action: 5\n",
      "Reward: 20\n"
     ]
    }
   ],
   "source": [
    "from IPython.display import clear_output\n",
    "from time import sleep\n",
    "\n",
    "def print_frames(frames):\n",
    "    for i, frame in enumerate(frames):\n",
    "        clear_output(wait=True)\n",
    "        print(frame['frame'])\n",
    "        print(f\"Timestep: {i + 1} of {len(frames)}\")\n",
    "        print(f\"State: {frame['state']}\")\n",
    "        print(f\"Action: {frame['action']}\")\n",
    "        print(f\"Reward: {frame['reward']}\")\n",
    "        sleep(.01)\n",
    "        \n",
    "print_frames(frames)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "724205e2",
   "metadata": {},
   "source": [
    "#### Pretty bad driving, isn't it?"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7de99f7e",
   "metadata": {},
   "source": [
    "## Let's generate histograms to quantify performance"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "id": "26de2a7d",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "100%|███████████████████████████████████████████████████████████████████| 100/100 [00:06<00:00, 14.87it/s]\n"
     ]
    }
   ],
   "source": [
    "from tqdm import tqdm\n",
    "\n",
    "n_episodes = 100\n",
    "\n",
    "# For plotting metrics\n",
    "timesteps_per_episode = []\n",
    "penalties_per_episode = []\n",
    "\n",
    "for i in tqdm(range(0, n_episodes)):\n",
    "    \n",
    "    # reset environment to a random state\n",
    "    state = env.reset()\n",
    "\n",
    "    epochs, penalties, reward, = 0, 0, 0\n",
    "    done = False\n",
    "    \n",
    "    while not done:\n",
    "        \n",
    "        action = agent.get_action(state)       \n",
    "        next_state, reward, done, info = env.step(action) \n",
    "               \n",
    "        if reward == -10:\n",
    "            penalties += 1\n",
    "\n",
    "        state = next_state\n",
    "        epochs += 1\n",
    "    \n",
    "    timesteps_per_episode.append(epochs)\n",
    "    penalties_per_episode.append(penalties)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 59,
   "id": "20149669",
   "metadata": {},
   "outputs": [
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       "   <rect x=\"39.65\" y=\"22.318125\" width=\"669.6\" height=\"217.44\"/>\n",
       "  </clipPath>\n",
       " </defs>\n",
       "</svg>\n"
      ],
      "text/plain": [
       "<Figure size 864x288 with 1 Axes>"
      ]
     },
     "metadata": {
      "needs_background": "light"
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "import pandas as pd\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "fig, ax = plt.subplots(figsize = (12, 4))\n",
    "ax.set_title(\"Timesteps to complete ride\")    \n",
    "pd.Series(timesteps_per_episode).plot(kind=\"line\")\n",
    "plt.show()\n",
    "\n",
    "fig, ax = plt.subplots(figsize = (12, 4))\n",
    "ax.set_title(\"Penalties per ride\")    \n",
    "pd.Series(penalties_per_episode).plot(kind=\"line\")\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 71,
   "id": "ee7baa61",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Avg steps to complete ride: 2402.38\n",
      "Avg penalties to complete ride: 777.18\n"
     ]
    }
   ],
   "source": [
    "print(f'Avg steps to complete ride: {np.array(timesteps_per_episode).mean()}')\n",
    "print(f'Avg penalties to complete ride: {np.array(penalties_per_episode).mean()}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "28c67b86",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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