G1DBinaryString – the classical binary string chromosome

This is the classical chromosome representation on GAs, it is the 1D Binary String. This string looks like “00011101010”.

Default Parameters

Initializator

Initializators.G1DBinaryStringInitializator()

The Binatry String Initializator for G1DBinaryString

Mutator

Mutators.G1DBinaryStringMutatorFlip()

The Flip Mutator for G1DBinaryString

Crossover

Crossovers.G1DBinaryStringXSinglePoint()

The Single Point Crossover for G1DBinaryString

Class

class G1DBinaryString.G1DBinaryString(length=10)

G1DBinaryString Class - The 1D Binary String chromosome

Inheritance diagram for G1DBinaryString.G1DBinaryString:

This chromosome class extends the GenomeBase.GenomeBase and GenomeBase.G1DBase classes.

Example:

>>> genome = G1DBinaryString.G1DBinaryString(5)

Parameter:length – the 1D Binary String size

append(value)

Appends an item to the list

Example:

>>> g = G1DBinaryString(2)
>>> g.append(0)

Parameter:value – value to be added, 0 or 1

clearList()

Remove all genes from Genome

clone()

Return a new instace copy of the genome

Example:

>>> g = G1DBinaryString(5)
>>> for i in xrange(len(g)):
...    g.append(1)
>>> clone = g.clone()
>>> clone[0]
1

Return type:the G1DBinaryString instance clone

copy(g)

Copy genome to ‘g’

Example:

>>> g1 = G1DBinaryString(2)
>>> g1.append(0)
>>> g1.append(1)
>>> g2 = G1DBinaryString(2)
>>> g1.copy(g2)
>>> g2[1]
1

Parameter:g – the destination genome

crossover

This is the reproduction function slot, the crossover. You can change the default crossover method using:

genome.crossover.set(Crossovers.G1DBinaryStringXUniform)

evaluate(**args)

Called to evaluate genome

Parameter:args – this parameters will be passes to the evaluator

evaluator

This is the evaluation function slot, you can add a function with the set method:

genome.evaluator.set(eval_func)

getBinary()

Returns the binary string representation

Example:

>>> g = G1DBinaryString(2)
>>> g.append(0)
>>> g.append(1)
>>> g.getBinary()
'01'

Return type:the binary string

getDecimal()

Converts the binary string to decimal representation

Example:

>>> g = G1DBinaryString(5)
>>> for i in xrange(len(g)):
...    g.append(0)
>>> g[3] = 1
>>> g.getDecimal()
2

Return type:decimal value

getFitnessScore()

Get the Fitness Score of the genome

Return type:genome fitness score

getInternalList()

Returns the internal list of the genome

... note:: this method was created to solve performance issues :rtype: the internal list

getListSize()

Returns the list supposed size

Warning

this is different from what the len(obj) returns

getParam(key, nvl=None)

Gets an internal parameter

Example:

>>> genome.getParam("rangemax")
100

Note

All the individuals of the population shares this parameters and uses the same instance of this dict.

Parameters:

• key – the key of param
• nvl – if the key doesn’t exist, the nvl will be returned

getRawScore()

Get the Raw Score of the genome

Return type:genome raw score

initializator

This is the initialization function of the genome, you can change the default initializator using the function slot:

genome.initializator.set(Initializators.G1DBinaryStringInitializator)

In this example, the initializator Initializators.G1DBinaryStringInitializator() will be used to create the initial population.

initialize(**args)

Called to initialize genome

Parameter:args – this parameters will be passed to the initializator

mutate(**args)

Called to mutate the genome

Parameter:args – this parameters will be passed to the mutator Return type:the number of mutations returned by mutation operator

mutator

This is the mutator function slot, you can change the default mutator using the slot set function:

genome.mutator.set(Mutators.G1DBinaryStringMutatorSwap)

remove(value)

Removes an item from the list

Example:

>>> genome.remove(44)

Parameter:value – value to be added

resetStats()

Clear score and fitness of genome

resumeString()

Returns a resumed string representation of the Genome

setInternalList(lst)

Assigns a list to the internal list of the chromosome

Parameter:lst – the list to assign the internal list of the chromosome

setParams(**args)

Set the internal params

Example:

>>> genome.setParams(rangemin=0, rangemax=100, gauss_mu=0, gauss_sigma=1)

Note

All the individuals of the population shares this parameters and uses the same instance of this dict.

Parameter:args – this params will saved in every chromosome for genetic op. use