Fix file size of notebook (#103)

* Fix file size of notebook

* Fix format

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Change comment

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: devmotion

examples/a-regression/script.jl

@@ -12,10 +12,14 @@
 using ApproximateGPs
 using Distributions
 using LinearAlgebra
-#jl using DisplayAs
 
 using Plots
+## We output plots as PNG to reduce their size
 default(; fmt=:png, palette=:seaborn_colorblind, legend=:outertopright, size=(700, 400))
+#nb ## Regardless of the `fmt` setting, by default Literate saves also the SVG output
+#nb ## in notebooks: https://github.com/fredrikekre/Literate.jl/issues/61
+#nb ## We use DisplayAs to ensure that only the PNG output is saved.
+#nb using DisplayAs
 
 using Random
 Random.seed!(1234);
@@ -30,10 +34,8 @@ N = 10000 # Number of training points
 x = rand(Uniform(-1, 1), N)
 y = g.(x) + 0.3 * randn(N)
 
-plt = scatter(
-    x, y; xlabel="x", ylabel="y", markershape=:xcross, markeralpha=0.1, legend=false
-)
-#jl DisplayAs.PNG(plt)
+scatter(x, y; xlabel="x", ylabel="y", markershape=:xcross, markeralpha=0.1, legend=false)
+#nb DisplayAs.PNG(current())
 
 # ## Set up a Flux model
 #
@@ -149,7 +151,7 @@ model = SVGPModel(k_init, z_init, m_init, A_init);
 # very poor fit to the data, as expected:
 
 init_post = model_posterior(model)
-plt = scatter(
+scatter(
     x,
     y;
     xlabel="x",
@@ -158,8 +160,8 @@ plt = scatter(
     markeralpha=0.1,
     label="Training Data",
 )
-plot!(plt, -1:0.001:1, init_post; label="Initial Posterior", color=4)
-#jl DisplayAs.PNG(plt)
+plot!(-1:0.001:1, init_post; label="Initial Posterior", color=4)
+#nb DisplayAs.PNG(current())
 
 # ## Training the model
 #
@@ -200,7 +202,7 @@ loss(model, x, y)
 
 post = model_posterior(model)
 
-plt = scatter(
+scatter(
     x,
     y;
     markershape=:xcross,
@@ -212,6 +214,6 @@ plt = scatter(
     label="Training Data",
     color=1,
 )
-plot!(plt, -1:0.001:1, post; label="Posterior", color=4)
-sticks!(plt, model.z, fill(0.13, M); label="Pseudo-points", linewidth=1.5, color=5)
-#jl DisplayAs.PNG(plt)
+plot!(-1:0.001:1, post; label="Posterior", color=4)
+sticks!(model.z, fill(0.13, M); label="Pseudo-points", linewidth=1.5, color=5)
+#nb DisplayAs.PNG(current())