private static IEnumerable <double> GatherInterimPerformance(
IEnumerable <double> learningRates,
Func <double, ICliffWalkingAgent> createAgentFunc)
{
const int numRuns = 50;
var env = new CliffWalkingEnvironment();
foreach (var rate in learningRates)
{
var firstXEpisodeAverages = new List <double>();
for (var i = 0; i < numRuns; i++)
{
env.Reset();
var agent = createAgentFunc(rate);
agent.ImproveEstimates(env, out var diags, NumEpisodesForInterim);
firstXEpisodeAverages.Add(diags.RewardSumPerEpisode.Average());
}
yield return(firstXEpisodeAverages.Average());
}
}
private static IEnumerable <double> GatherAsymptoticPerformance(
IEnumerable <double> learningRates,
Func <double, ICliffWalkingAgent> createAgentFunc)
{
var env = new CliffWalkingEnvironment();
foreach (var rate in learningRates)
{
env.Reset();
var agent = createAgentFunc(rate);
var sw = Stopwatch.StartNew();
agent.ImproveEstimates(env, out var diags, NumEpisodesForAsymptote);
Console.WriteLine($"ran {NumEpisodesForAsymptote} episodes in {sw.Elapsed}");
yield return(diags.RewardSumPerEpisode.Average());
}
}
private static IEnumerable <Position> GreedyPath(
CliffWalkingEnvironment env, IStateActionValues values)
{
var currentPosition = env.Reset();
var isDone = false;
while (!isDone)
{
yield return(currentPosition);
var bestAction = values
.ActionValues(currentPosition)
.OrderBy(av => av.Item2)
.Last().Item1;
var(observation, _, done) = env.Step(bestAction);
currentPosition = observation;
isDone = done;
}
yield return(currentPosition);
}
