3.8.多层感知机.ipynb

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   "source": [
    "%matplotlib inline\n",
    "import d2lzh as d2l\n",
    "from mxnet import autograd, nd\n",
    "# 绘图函数\n",
    "def xyplot(x_vals, y_vals, name):\n",
    "    d2l.set_figsize(figsize=(5, 2.5))\n",
    "    d2l.plt.plot(x_vals.asnumpy(), y_vals.asnumpy())\n",
    "    d2l.plt.xlabel('x')\n",
    "    d2l.plt.ylabel(name + '(x)')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### ReLU函数"
   ]
  },
  {
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   "execution_count": 2,
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     "end_time": "2019-05-14T06:11:59.873562Z",
     "start_time": "2019-05-14T06:11:59.700026Z"
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      "text/plain": [
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     },
     "metadata": {
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     "output_type": "display_data"
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   ],
   "source": [
    "x = nd.arange(-8.0, 8.0, 0.1)\n",
    "x.attach_grad()\n",
    "with autograd.record():\n",
    "    y = x.relu()\n",
    "xyplot(x, y, 'relu')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-05-14T06:22:22.686513Z",
     "start_time": "2019-05-14T06:22:22.541884Z"
    }
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   "source": [
    "y.backward()\n",
    "xyplot(x, x.grad, 'grad of relu')"
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### sigmoid函数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-05-14T06:23:06.737368Z",
     "start_time": "2019-05-14T06:23:06.602726Z"
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      "text/plain": [
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     },
     "metadata": {
      "needs_background": "light"
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     "output_type": "display_data"
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   ],
   "source": [
    "with autograd.record():\n",
    "    y = x.sigmoid()\n",
    "xyplot(x, y, 'sigmoid')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-05-14T06:23:29.410543Z",
     "start_time": "2019-05-14T06:23:29.281888Z"
    }
   },
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   "source": [
    "y.backward()\n",
    "xyplot(x, x.grad, 'grad of sigmoid')"
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### tanh函数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-05-14T06:24:02.768672Z",
     "start_time": "2019-05-14T06:24:02.637028Z"
    }
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     },
     "metadata": {
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     "output_type": "display_data"
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   ],
   "source": [
    "with autograd.record():\n",
    "    y = x.tanh()\n",
    "xyplot(x, y, 'tanh')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-05-14T06:24:08.902579Z",
     "start_time": "2019-05-14T06:24:08.769936Z"
    }
   },
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