public void Mutate1(VRandom rng, double rate)
{
if (rng.RandBool(P_Insert * rate))
{
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
mystr = mystr + (char)c;
}
else
{
//converts the string to a char array
char[] temp = mystr.ToCharArray();
//increments or decrements a random character
int index = rng.RandInt(0, temp.Length);
bool add = rng.RandBool();
int c = (int)temp[index] + (add ? 1 : -1);
//makes shure the resulting character is valid
if (c < 32)
{
c = 32;
}
if (c > 126)
{
c = 126;
}
temp[index] = (char)c;
//sets the new mutated string
mystr = new String(temp);
}
}
/// <summary>
/// Obtains the prototype of a randomly slected species. By evaluating
/// diffrent species, and not just the best preforming organism, we can
/// tell if the popluation is remaning homogonous or diversifying.
/// </summary>
/// <param name="container">A container to store the genome</param>
public void GetRandProto(T container)
{
int index = rng.RandInt(species.Count);
T proto = species[index].Prototype.Genome;
container.Overwrite(proto);
}
/// <summary>
/// Helper method: Selects a single nuron from the network at random.
/// </summary>
/// <returns>A randomly selected nuron</returns>
private NuronOld RandNuron()
{
//generates a random nuron in O(n)
int index = rng.RandInt(nurons.Count);
return(nurons.ElementAt(index).Item);
}
public void Crossover(VRandom rng, GenString genome)
{
int len1 = this.mystr.Length;
int len2 = genome.mystr.Length;
int min = Math.Min(len1, len2);
int cp = rng.RandInt(-min, min);
string s1, s2;
if (cp < 0)
{
//corrects for the negative index
cp = min + cp;
s1 = genome.mystr.Substring(0, cp);
s2 = this.mystr.Substring(cp, len1 - cp);
}
else
{
s1 = this.mystr.Substring(0, cp);
s2 = genome.mystr.Substring(cp, len2 - cp);
}
//concatinates the two substrings
mystr = s1 + s2;
}
public void Mutate(VRandom rng, double rate)
{
if (rng.RandBool(P_Insert * rate))
{
int index = rng.RandInt(1, mystr.Length);
int len = mystr.Length;
//splits the string at the instertion point
string s1 = mystr.Substring(0, index);
string s2 = mystr.Substring(index, len - index);
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
mystr = s1 + (char)c + s2;
}
//converts the string to a char array
char[] temp = mystr.ToCharArray();
if (rng.RandBool(P_Swap * rate))
{
//select two random indicies
int i = rng.RandInt(0, temp.Length);
int j = rng.RandInt(0, temp.Length);
//swaps the characters at the two incicies
char c = temp[i];
temp[i] = temp[j];
temp[j] = c;
}
for (int i = 0; i < temp.Length; i++)
{
//skips over characters with the inverse rate
if (!rng.RandBool(rate))
{
continue;
}
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
temp[i] = (char)c;
}
//sets the new mutated string
mystr = new String(temp);
}
public void Mutate4(VRandom rng, double rate)
{
if (rng.RandBool(P_Insert * rate))
{
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
mystr = mystr + (char)c;
}
else
{
//converts the string to a char array
char[] temp = mystr.ToCharArray();
//increments or decrements a random character
int index = rng.RandInt(0, temp.Length);
int c = rng.RandInt(32, 127);
temp[index] = (char)c;
//sets the new mutated string
mystr = new String(temp);
}
}
public void Randomize(VRandom rng)
{
char[] temp = new char[mystr.Length];
for (int i = 0; i < temp.Length; i++)
{
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
temp[i] = (char)c;
}
//sets the new random string
mystr = new String(temp);
}
public void Mutate2(VRandom rng, double rate)
{
if (rng.RandBool(P_Insert * rate))
{
//selects a random character in the ASCII range
int c = rng.RandInt(32, 127);
mystr = mystr + (char)c;
}
else
{
//converts the string to a char array
char[] temp = mystr.ToCharArray();
for (int i = 0; i < temp.Length; i++)
{
//alters each character with a chance of 'rate'
if (!rng.RandBool(rate))
{
continue;
}
//increments or decrements the character
bool add = rng.RandBool();
int c = (int)temp[i] + (add ? 1 : -1);
//makes shure the resulting character is valid
if (c < 32)
{
c = 32;
}
if (c > 126)
{
c = 126;
}
temp[i] = (char)c;
}
//sets the new mutated string
mystr = new String(temp);
}
}
private int GetRandomIndex(VRandom rng)
{
int index = -1;
int count = 0;
while (index < 0 && count < MAX_TRY)
{
//chooses a ranom positive interger
index = rng.RandInt(MAX_ID);
//invalidates the index if we have a collision
if (nurons.HasKey(index))
{
index = -1;
}
count++;
}
return(index);
}
private ActFunc GetRandomActivation(VRandom rng)
{
//generates a random nuber to select the fuciton
int test = rng.RandInt(6);
switch (test)
{
case 0: return(ActFunc.Identity);
case 1: return(ActFunc.Sine);
case 2: return(ActFunc.Cosine);
case 3: return(ActFunc.Gaussian);
case 4: return(ActFunc.Sigmoid);
case 5: return(ActFunc.Sinc);
}
//we should never reach this point
throw new NotImplementedException();
}
