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Correction in the formula for mean square error #850

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norvig merged 1 commit into from
Mar 20, 2018
Merged

Correction in the formula for mean square error #850

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8 changes: 4 additions & 4 deletions neural_nets.ipynb
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Expand Up @@ -82,7 +82,7 @@
"\n",
"In both the Perceptron and the Neural Network, we are using the Backpropagation algorithm to train our weights. Basically it achieves that by propagating the errors from our last layer into our first layer, this is why it is called Backpropagation. In order to use Backpropagation, we need a cost function. This function is responsible for indicating how good our neural network is for a given example. One common cost function is the *Mean Squared Error* (MSE). This cost function has the following format:\n",
"\n",
"$$MSE=\\frac{1}{2} \\sum_{i=1}^{n}(y - \\hat{y})^{2}$$\n",
"$$MSE=\\frac{1}{n} \\sum_{i=1}^{n}(y - \\hat{y})^{2}$$\n",
"\n",
"Where `n` is the number of training examples, $\\hat{y}$ is our prediction and $y$ is the correct prediction for the example.\n",
"\n",
Expand Down Expand Up @@ -221,14 +221,14 @@
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