typo
noticed already fix in http://www.wildml.com/2015/09/implementing-a-neural-network-from-scratch/pull/12/head
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@ -286,7 +286,7 @@
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"source": [
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"$$\n",
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"\\begin{aligned}\n",
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"& \\delta_3 = y - \\hat{y} \\\\\n",
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"& \\delta_3 = \\hat{y} - y \\\\\n",
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"& \\delta_2 = (1 - \\tanh^2z_1) \\circ \\delta_3W_2^T \\\\\n",
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"& \\frac{\\partial{L}}{\\partial{W_2}} = a_1^T \\delta_3 \\\\\n",
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"& \\frac{\\partial{L}}{\\partial{b_2}} = \\delta_3\\\\\n",
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