逻辑斯蒂回归.ipynb

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    "## 逻辑斯蒂回归\n",
    "***\n",
    "***\n",
    "Time: 2020-09-10<br>\n",
    "Author: dsy\n",
    "***"
   ]
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   "source": [
    "import numpy as np\n",
    "def LogisticRegression(x,y,lr=0.01,iters=200):\n",
    "    w = np.zeros((len(x[0]),))\n",
    "    for each in range(iters):\n",
    "        for i in range(len(x)):\n",
    "            w += lr * ( y[i] - 1./ (1 + np.exp(-w.dot(x[i].T)))  ) * x[i]\n",
    "            \n",
    "    return w"
   ]
  }
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