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   "cell_type": "code",
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   "metadata": {},
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   "source": [
    "# check the change of objective values\n",
    "\n",
    "import matplotlib.pyplot as plt\n",
    "import numpy as np\n",
    "\n",
    "fpath='objective_function.txt'\n",
    "\n",
    "objs=[]\n",
    "\n",
    "with open(fpath) as f:\n",
    "    lines = f.readlines()\n",
    "\n",
    "    for l in lines:\n",
    "        if(l.startswith('i_inv')):\n",
    "            continue\n",
    "        objs.append(float(l.strip().split(',')[1]))\n",
    "\n",
    "\n",
    "plt.xlabel('iteration')\n",
    "plt.ylabel('objective function value')\n",
    "plt.plot(objs)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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