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imaginedays · Mar 11, 2018 · 9e9b222 · 9e9b222
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diff --git a/contents/Machine_Learning/Gradient_descent.ipynb b/contents/Machine_Learning/Gradient_descent.ipynb
@@ -225,9 +225,7 @@
     "| :---:   |  ---: \n",
     "| 导数   $ f^{'}(x)  $    | 函数在该点的瞬时变化率        \n",
     "| 偏导数 $ \\frac{\\partial f(x,y) }{\\partial x}  $\t        | 函数在坐标轴方向上的变化率       \n",
-    "| 方向导数 $\\left.\\begin{matrix} \n",
-    "\\frac{\\partial f}{\\partial l} \n",
-    "\\end{matrix}\\right|_{(x_{0},y_{0})} $       | 函数在某点沿某个特定方向的变化率      \n",
+    "| 方向导数 $\\left.\\begin{matrix}\\frac{\\partial f}{\\partial l}\\end{matrix}\\right|_{(x_{0},y_{0})} $       | 函数在某点沿某个特定方向的变化率      \n",
     "| 梯度  $ \\textbf{grad}\\;\\;f(x,y)  $    | 函数在该点沿所有方向变化率最大的那个方向     \n",
     "\n",
     "------------------------------------------------------\n"
@@ -476,7 +474,7 @@
     "> \n",
     "> Follow: [halfrost · GitHub](https://github.com/halfrost)\n",
     ">\n",
-    "> Source: [https://github.com/halfrost/Halfrost-Field/blob/master/contents/Model\\_and\\_Cost\\_Function.md](https://github.com/halfrost/Halfrost-Field/blob/master/contents/Model_and_Cost_Function.md)"
+    "> Source: [https://github.com/halfrost/Halfrost-Field/blob/master/contents/Machine\\_Learning/Gradient\\_descent.ipynb](https://github.com/halfrost/Halfrost-Field/blob/master/contents/Machine_Learning/Gradient_descent.ipynb)"
    ]
   }
  ],

diff --git a/contents/Machine_Learning/梯度_.md b/contents/Machine_Learning/梯度_.md