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    "# [6.3 Regression Planning](http://artint.info/2e/html/ArtInt2e.Ch6.S3.html)\n",
    "- [Implementation Details](http://artint.info/AIPython/aipython.pdf#page=89) (page 89)\n",
    "\n",
    "## About\n",
    "In a regression planner, a node is a subgoal that need to be achieved. This is different than in a forward planner, where a node is instead state. The regression planner can also use a heuristic function, just as with the forward planner. However, a heuristic useful for a forward planner does not necessarily mean it is useful for a regression planner, and vice versa.\n",
    "\n",
    "You can run each cell by selecting it and pressing *Ctrl+Enter* in Windows or *Shift+Return* in MacOS. Alternatively, you can click the *Play* button in the toolbar, to the left of the stop button. For more information, check out our AISpace2 [Tutorial](https://aispace2.github.io/AISpace2/tutorial.html).\n",
    "\n",
    "Feel free to modify our codes either in this notebook or somewhere outside (e.g. python files in `/aipython/`). If you want to modify our codes outside, you might find [this](https://aispace2.github.io/AISpace2/tutorial.html#tutorial-faq-why-update-aipython-not-reflect) helpful for how your changes can take effect.\n",
    "\n",
    "You need to run the following command to import our pre-defined problems. You can also define your own problems ([how?](https://aispace2.github.io/AISpace2/tutorial.html#tutorial-planning-construct-yourself)). "
   ]
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "# Run this to import pre-defined problems\n",
    "from aipython.stripsProblem import strips_delivery1, strips_delivery2, strips_delivery3, strips_blocks1, strips_blocks2, strips_blocks3, strips_elevator"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from aipython.searchMPP import SearcherMPP\n",
    "from aipython.stripsRegressionPlanner import Regression_STRIPS\n",
    "from aipython.stripsHeuristic import heuristic_fun\n",
    "\n",
    "search_regression = Regression_STRIPS(planning_problem=strips_delivery2)\n",
    "# If you want a heuristic, use this instead:\n",
    "# search_regression = Regression_STRIPS(planning_problem=strips_delivery2, heur=heuristic_fun)\n",
    "s_mpp = SearcherMPP(problem=search_regression)\n",
    "\n",
    "# Visualization options\n",
    "# For more explanation please visit: https://aispace2.github.io/AISpace2/tutorial.html#tutorial-common-visualization-options\n",
    "s_mpp.sleep_time = 0.2 # The time, in seconds, between each step in auto solving\n",
    "s_mpp.line_width = 2.0 # The thickness of edges\n",
    "s_mpp.text_size = 13 # The fontsize of the text\n",
    "s_mpp.detail_level = 2 # 0=no text, 1=truncated text, 2=full text\n",
    "s_mpp.show_edge_costs = False\n",
    "s_mpp.show_node_heuristics = False\n",
    "\n",
    "# Display the widget\n",
    "display(s_mpp)\n",
    "s_mpp.search()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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