Added feed forward perceptron

tikz/feed-forward-perceptron/Makefile

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+SOURCE = feed-forward-perceptron
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	make
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
+	rsvg-convert -a -w $(WIDTH) -f svg $(SOURCE).svg -o $(SOURCE)2.svg
+	inkscape $(SOURCE)2.svg --export-plain-svg=$(SOURCE).svg
+	rm $(SOURCE)2.svg

tikz/feed-forward-perceptron/Readme.md

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+Compiled example
+----------------
+![Example](feed-forward-perceptron.png)

tikz/feed-forward-perceptron/feed-forward-perceptron.tex

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+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+ 
+\usepackage{tikz}
+\usetikzlibrary{arrows} 
+
+\tikzstyle{input}=[draw,fill=red!50,circle,minimum size=10pt,inner sep=0pt]
+\tikzstyle{hidden}=[draw,fill=green!50,circle,minimum size=10pt,inner sep=0pt]
+\tikzstyle{output}=[draw,fill=blue!50,circle,minimum size=10pt,inner sep=0pt]
+\tikzstyle{bias}=[draw,dashed,fill=gray!50,circle,minimum size=10pt,inner sep=0pt]
+
+\begin{document}
+\begin{preview}
+\begin{tikzpicture}
+  \node (b1)[bias] at (-1,0) {};
+  \node (b2)[bias] at (-0.5,1) {};
+  \node (i1)[input] at (0,0) {};
+  \node (i2)[input] at (1,0) {};
+  \node (i3)[input] at (2,0) {};
+  \node (i4)[input] at (3,0) {};
+  \node (i5)[input] at (4,0) {};
+  \node (h1)[hidden] at (0.5,1) {};
+  \node (h2)[hidden] at (1.5,1) {};
+  \node (h3)[hidden] at (2.5,1) {};
+  \node (o1)[output] at (1.5,2) {};
+
+	\draw (b2) -- (o1);
+	\draw (h1) -- (o1);
+	\draw (h2) -- (o1);
+	\draw (h3) -- (o1);
+
+    \foreach \j in {1, ..., 3}{
+    	\foreach \i in {1, ..., 5}{
+			\draw (h\j) -- (i\i);
+		}
+		\draw (h\j) -- (b1);
+	}
+\end{tikzpicture}
+\end{preview}
+\end{document}