Fix t-SNE example gnuplot path (rust-ml#218)

* Fix tsne example gnuplot path

* Fix tsne mnist example gnuplot path

Author: Wint3rmute

algorithms/linfa-tsne/examples/iris_plot.plt

@@ -4,4 +4,4 @@ set style line 2 lc rgb 'blue'
 set style line 3 lc rgb 'green'
 
 set style data points
-plot 'iris.dat' using 1:2:3 linecolor variable pt 7 ps 2 t ''
+plot 'examples/iris.dat' using 1:2:3 linecolor variable pt 7 ps 2 t ''

algorithms/linfa-tsne/examples/mnist_plot.plt

@@ -4,4 +4,4 @@ set style line 2 lc rgb 'blue'
 set style line 3 lc rgb 'green'
 
 set style data points
-plot 'mnist.dat' using 1:2:3 linecolor variable pt 7 ps 2 t ''
+plot 'examples/mnist.dat' using 1:2:3 linecolor variable pt 7 ps 2 t ''