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Fix RBF kernel length scale calculation #2665

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Fix RBF kernel length scale calculation #2665

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2 changes: 1 addition & 1 deletion chapter_gaussian-processes/gp-priors.md
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Expand Up @@ -117,7 +117,7 @@ We illustrate this process in the figure below.
```{.python .input}
def rbfkernel(x1, x2, ls=4.): #@save
dist = distance_matrix(np.expand_dims(x1, 1), np.expand_dims(x2, 1))
return np.exp(-(1. / ls / 2) * (dist ** 2))
return np.exp(-(1. / ls**2 / 2) * (dist ** 2))

x_points = np.linspace(0, 5, 50)
meanvec = np.zeros(len(x_points))
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