Add gnuplot graphing script

Note to self: This was lifted from our PhD-Code repo

.gitignore

@@ -227,3 +227,12 @@ dist
 .vscode-test
 
 # End of https://www.toptal.com/developers/gitignore/api/node,git,archives,images
+
+# Created by https://www.toptal.com/developers/gitignore/api/libreoffice
+# Edit at https://www.toptal.com/developers/gitignore?templates=libreoffice
+
+### LibreOffice ###
+# LibreOffice locks
+.~lock.*#
+
+# End of https://www.toptal.com/developers/gitignore/api/libreoffice

gnuplot/generate-graph.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+script_root="$(dirname "$(readlink -f "$0")")";
+
+temp_dir="$(mktemp --tmpdir -d "gnuplot-XXXXXXX")";
+
+on_exit() {
+	rm -rf "${temp_dir}";
+}
+trap on_exit EXIT;
+
+graph_data_rmse() {
+	jq --raw-output "[ input_line_number - 1, (.mse | sqrt), (.val_mse | sqrt) ] | @tsv"
+}
+
+metrics_filename="${1}";
+
+if [[ -z "${metrics_filename}" ]]; then
+	echo "Error: No metrics json file specified.";
+	exit 1;
+fi
+
+tmpfile_metrics="${temp_dir}/data";
+
+graph_data_rmse <"${metrics_filename}" >"${tmpfile_metrics}";
+gnuplot -e "metric_name='Root Mean Squared Error'; graph_title='Film Genres Predictor - Root Mean Squared Error'; data_filename='${tmpfile_metrics}'" "${script_root}/tensorflow-metrics.plt"

gnuplot/tensorflow-metrics.plt

@@ -0,0 +1,9 @@
+set title graph_title
+set xlabel "Epochs"
+set ylabel metric_name
+set key title "Legend"
+set grid
+
+set datafile separator "\t"
+set terminal png linewidth 3 size 1366,768
+plot data_filename using 1:2 with lines title "Training", data_filename using 1:3 with lines title "Validation"