Post by warspyking on Sept 22, 2016 14:49:46 GMT
Check out what I found! github.com/wixico/luann
--[[The MIT License (MIT)
Copyright (c) <2013> <Josh Rowe>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
]]--
--Borrowed table persistence from http://lua-users.org/wiki/TablePersistence, MIT license.
--comments removed, condensed code to oneliners where possible.
local write, writeIndent, writers, refCount;
persistence =
{
store = function (path, ...)
local file, e = io.open(path, "w")
if not file then return error(e) end
local n = select("#", ...)
local objRefCount = {} -- Stores reference that will be exported
for i = 1, n do refCount(objRefCount, (select(i,...))) end
local objRefNames = {}
local objRefIdx = 0;
file:write("-- Persistent Data\n");
file:write("local multiRefObjects = {\n");
for obj, count in pairs(objRefCount) do
if count > 1 then
objRefIdx = objRefIdx + 1;
objRefNames[obj] = objRefIdx;
file:write("{};"); -- table objRefIdx
end;
end;
file:write("\n} -- multiRefObjects\n");
for obj, idx in pairs(objRefNames) do
for k, v in pairs(obj) do
file:write("multiRefObjects["..idx.."][");
write(file, k, 0, objRefNames);
file:write("] = ");
write(file, v, 0, objRefNames);
file:write(";\n");
end;
end;
for i = 1, n do
file:write("local ".."obj"..i.." = ");
write(file, (select(i,...)), 0, objRefNames);
file:write("\n");
end
if n > 0 then
file:write("return obj1");
for i = 2, n do
file:write(" ,obj"..i);
end;
file:write("\n");
else
file:write("return\n");
end;
file:close();
end;
load = function (path)
local f, e = loadfile(path);
if f then
return f();
else
return nil, e;
end;
end;
}
write = function (file, item, level, objRefNames)
writers[type(item)](file, item, level, objRefNames);
end;
writeIndent = function (file, level)
for i = 1, level do
file:write("\t");
end;
end;
refCount = function (objRefCount, item)
if type(item) == "table" then
if objRefCount[item] then
objRefCount[item] = objRefCount[item] + 1;
else
objRefCount[item] = 1;
for k, v in pairs(item) do
refCount(objRefCount, k);
refCount(objRefCount, v);
end;
end;
end;
end;
writers = {
["nil"] = function (file, item) file:write("nil") end;
["number"] = function (file, item)
file:write(tostring(item));
end;
["string"] = function (file, item)
file:write(string.format("%q", item));
end;
["boolean"] = function (file, item)
if item then
file:write("true");
else
file:write("false");
end
end;
["table"] = function (file, item, level, objRefNames)
local refIdx = objRefNames[item];
if refIdx then
file:write("multiRefObjects["..refIdx.."]");
else
file:write("{\n");
for k, v in pairs(item) do
writeIndent(file, level+1);
file:write("[");
write(file, k, level+1, objRefNames);
file:write("] = ");
write(file, v, level+1, objRefNames);
file:write(";\n");
end
writeIndent(file, level);
file:write("}");
end;
end;
["function"] = function (file, item)
local dInfo = debug.getinfo(item, "uS");
if dInfo.nups > 0 then
file:write("nil --[[functions with upvalue not supported]]");
elseif dInfo.what ~= "Lua" then
file:write("nil --[[non-lua function not supported]]");
else
local r, s = pcall(string.dump,item);
if r then
file:write(string.format("loadstring(%q)", s));
else
file:write("nil --[[function could not be dumped]]");
end
end
end;
["thread"] = function (file, item)
file:write("nil --[[thread]]\n");
end;
["userdata"] = function (file, item)
file:write("nil --[[userdata]]\n");
end;
}
local luann = {}
local Layer = {}
local Cell = {}
local exp = math.exp
--We start by creating the cells.
--The cell has a structure containing weights that modify the input from the previous layer.
--Each cell also has a signal, or output.
function Cell:new(numInputs)
local cell = {delta = 0, weights = {}, signal = 0}
for i = 1, numInputs do
cell.weights[i] = math.random() * .1
end
setmetatable(cell, self)
self.__index = self
return cell
end
function Cell:activate(inputs, bias, threshold)
local signalSum = bias
local weights = self.weights
for i = 1, #weights do
signalSum = signalSum + (weights[i] * inputs[i])
end
self.signal = 1 / (1 + exp((signalSum * -1) / threshold))
end
--Next we create a Layer of cells. The layer is a table of cells.
function Layer:new(numCells, numInputs)
numCells = numCells or 1
numInputs = numInputs or 1
local cells = {}
for i = 1, numCells do cells[i] = Cell:new(numInputs) end
local layer = {cells = cells, bias = math.random()}
setmetatable(layer, self)
self.__index = self
return layer
end
--layers = {table of layer sizes from input to output}
function luann:new(layers, learningRate, threshold)
local network = {learningRate = learningRate, threshold = threshold}
--initialize the input layer
network[1] = Layer:new(layers[1], layers[1])
--initialize the hidden layers and output layer
for i = 2, #layers do
network[i] = Layer:new(layers[i], layers[i-1])
end
setmetatable(network, self)
self.__index = self
return network
end
function luann:activate(inputs)
local threshold = self.threshold
for i = 1, #inputs do
self[1].cells[i].signal = inputs[i]
end
for i = 2, #self do
local passInputs = {}
local cells = self[i].cells
local prevCells = self[i-1].cells
for m = 1, #prevCells do
passInputs[m] = prevCells[m].signal
end
local passBias = self[i].bias
for j = 1, #cells do
--activate each cell
cells[j]:activate(passInputs, passBias, threshold)
end
end
end
function luann:decode(hiddenSignal)
--iterate over the hidden layer and set their signals to hiddenInputs
for i = 1, #self[2].cells do
self[2].cells[i].signal = hiddenSignal[i]
end
local threshold = self.threshold
for i = 3, #self do
local passInputs = {}
local cells = self[i].cells
local prevCells = self[i-1].cells
for m = 1, #prevCells do
passInputs[m] = prevCells[m].signal
end
local passBias = self[i].bias
for j = 1, #cells do
--activate each cell
cells[j]:activate(passInputs, passBias, threshold)
end
end
end
function luann:bp(inputs, outputs)
self:activate(inputs) --update the internal inputs and outputs
local numSelf = #self
local learningRate = self.learningRate
for i = numSelf, 2, -1 do --iterate backwards (nothing to calculate for input layer)
local numCells = #self[i].cells
local cells = self[i].cells
for j = 1, numCells do
local signal = cells[j].signal
if i ~= numSelf then --special calculations for output layer
local weightDelta = 0
local layer = self[i+1].cells
for k = 1, #self[i+1].cells do
weightDelta = weightDelta + layer[k].weights[j] * layer[k].delta
end
cells[j].delta = signal * (1 - signal) * weightDelta
else
cells[j].delta = (outputs[j] - signal) * signal * (1 - signal)
end
end
end
for i = 2, numSelf do
self[i].bias = self[i].cells[#self[i].cells].delta * learningRate
for j = 1, #self[i].cells do
for k = 1, #self[i].cells[j].weights do
local weights = self[i].cells[j].weights
weights[k] = weights[k] + self[i].cells[j].delta * learningRate * self[i-1].cells[k].signal
end
end
end
end
function luann:saveNetwork(network, savefile)
print(savefile)
persistence.store(savefile, network)
end
function luann:loadNetwork(savefile)
local ann = persistence.load(savefile)
ann.bp = luann.bp
ann.activate = luann.activate
for i = 1, #ann do
for j = 1, #ann[i].cells do
ann[i].cells[j].activate = Cell.activate
end
end
return(ann)
end
function luann:loadTrainingDataFromFile(fileName)
local trainingData = {}
local fileLines = {}
local f = io.open(fileName, "rb")
for line in f:lines() do
table.insert (fileLines, line);
end
f:close()
for i = 1, #fileLines do
if i%2 == 0 then
local tempInputs = {}
for input in fileLines[i]:gmatch("%S+") do table.insert(tempInputs, tonumber(input)) end
local tempOutputs = {}
for output in fileLines[i+1]:gmatch("%S+") do table.insert(tempOutputs, tonumber(input)) end
table.insert(trainingData, {tempInputs, tempOutputs})
end
end
return(trainingData)
end
return(luann)
