/// <summary>
/// Calculates the resulting fitness value by using the passed weights
/// and returns the value in a FitnessInfo class together with other relevant info about the calculation.
/// </summary>
public IFitnessInfo CalculateFitness(double[] weightsForNeuralNetwork)
{
int action = 0;
int currentScore = 0;
int movesSincePoint = 0;
int movesTotal = 0;
double fitness = 0;
double averageMovesPerFood = 0;
double[] input = new double[ProgramSettings.NUMBER_OF_INPUT_NEURONS];
EndGameInfo endGameInfo;
// Setup new snake game and neural network
neuralNetwork = new NeuralNetwork(NetworkSettings, weightsForNeuralNetwork);
snakeGame = new SnakeGame(SnakeSettings);
// Make recorder
if (record)
{
recorder = new FitnessCalculatorRecording(agentToRecord, NetworkSettings, SnakeSettings);
recorder.TakeSnapShotInitial(snakeGame, movesSincePoint, movesTotal, input, neuralNetwork);
}
// Simulation begins
do
{
input = ConvertGridToInput(snakeGame.Grid, snakeGame.Snake, snakeGame.Food);
action = neuralNetwork.CalculateOutput(input);
snakeGame.UpdateDirection(action);
// Check if got point
if (snakeGame.Score != currentScore)
{
movesSincePoint = 0;
currentScore = snakeGame.Score;
}
else
{
movesSincePoint++;
}
movesTotal++;
if (record) // Save round info.
{
recorder.TakeSnapShotRound(snakeGame, movesSincePoint, movesTotal, input, neuralNetwork);
}
FitnessRoundsCount++;
} while(snakeGame.Snake.IsAlive && movesSincePoint < GetMaxMoves(snakeGame.Snake.Lenght));
if (snakeGame.FoodEaten != 0)
{
averageMovesPerFood = movesTotal / (double)snakeGame.FoodEaten;
}
fitness = snakeGame.Score;
endGameInfo = new EndGameInfo(snakeGame, fitness, averageMovesPerFood, movesTotal);
if (record)
{
recorder.TakeSnapShotEndGame(endGameInfo);
}
return(endGameInfo);
}
/// <summary>
/// Runs a play test simulation of the saved agent and returns the result.
/// </summary>
/// <param name="savedAgent"></param>
/// <param name="testType"></param>
/// <param name="record"></param>
/// <returns></returns>
public PlaytestResult RunSimulation(SavedAgent savedAgent, TestType testType, bool record)
{
int action = 0;
int movesTotal = 0;
int currentScore = 0;
int movesSincePoint = 0;
int maxStepsBeforeTerminating = 1000;
double averageMovesPerFood = 0;
bool isInBounds = true;
PlaytestRecording recorder = null;
TestResult testResult = TestResult.Failed;
NetworkSettings networkSettings = (savedAgent.geneticSettings.FitnessCalculator as SnakeFitnessCalculator).NetworkSettings;
SnakeSettings snakeSettings = (savedAgent.geneticSettings.FitnessCalculator as SnakeFitnessCalculator).SnakeSettings;
// Setup new snake game and neural network
NeuralNetwork neuralNetwork = new NeuralNetwork(networkSettings, savedAgent.agent.Chromosome.ToArray());
double[] input = new double[networkSettings.numberOfInputNeurons];
SnakeGame snakeGame = new SnakeGame(snakeLevel);
// Make recorder
if (record)
{
recorder = new PlaytestRecording(savedAgent.agent, networkSettings, snakeSettings);
recorder.TakeSnapShotInitial(snakeGame);
}
if (record) // Save round info.
{
recorder.TakeSnapShotRound(snakeGame);
}
// Check within bounds.
if (testType == TestType.WithinBounds)
{
if (snakeGame.Grid.PointWithinGrid(snakeGame.Snake.Head.Point))
{
testResult = TestResult.Passed;
}
else
{
testResult = TestResult.Failed;
isInBounds = false;
}
}
if (isInBounds)
{
do
{
input = ConvertGridToInput(snakeGame.Grid, snakeGame.Snake, snakeGame.Food);
action = neuralNetwork.CalculateOutput(input);
snakeGame.UpdateDirection(action);
// Check if got point
if (snakeGame.Score != currentScore)
{
movesSincePoint = 0;
currentScore = snakeGame.Score;
}
else
{
movesSincePoint++;
}
movesTotal++;
if (record) // Save round info.
{
recorder.TakeSnapShotRound(snakeGame);
}
// Test within bounds.
if (testType == TestType.WithinBounds)
{
if (snakeGame.Grid.PointWithinGrid(snakeGame.Snake.Head.Point))
{
testResult = TestResult.Passed;
}
else
{
testResult = TestResult.Failed;
isInBounds = false;
}
}
} while(snakeGame.Snake.IsAlive && movesSincePoint < maxStepsBeforeTerminating && isInBounds);
}
// Check if snake completed game.
if (testType == TestType.CanComplete)
{
if (snakeGame.MaxScore != snakeGame.Score)
{
testResult = TestResult.Failed;
}
else
{
testResult = TestResult.Passed;
}
}
// Get avg. moves per food.
if (snakeGame.FoodEaten != 0)
{
averageMovesPerFood = movesTotal / (double)snakeGame.FoodEaten;
}
EndTestInfo endTestInfo = new EndTestInfo(snakeGame, movesTotal);
if (record)
{
recorder.TakeSnapShotEndTest(endTestInfo);
}
PlaytestResult playtestResult = new PlaytestResult(testResult, recorder);
return(playtestResult);
}