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Adding crossover function #100

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Adding crossover function #100

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9614692
Adding crossover function
enginefeeder101 Mar 10, 2018
d1a2db5
Merge branch 'master' into crossover
shiffman Mar 10, 2018
515100c
Fixed missing semicolon
enginefeeder101 Mar 15, 2018
3a76ec9
Add type checking and size checking to crossover functions
enginefeeder101 Mar 15, 2018
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11 changes: 11 additions & 0 deletions lib/matrix.js
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,17 @@ class Matrix {
return m;
}

static crossover(a, b, ratio = 0.5) {
if (!a instanceof this || !b instanceof this || a.rows !== b.rows || a.cols !== b.cols) {
console.log('Columns and Rows of A must match Columns and Rows of B.');
return;
}

let m = a.copy();
m.map((value, i, j) => Math.random() < ratio ? value : b.data[i][j]);
return m;
}

static fromArray(arr) {
return new Matrix(arr.length, 1).map((e, i) => arr[i]);
}
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13 changes: 13 additions & 0 deletions lib/nn.js
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Expand Up @@ -175,6 +175,19 @@ class NeuralNetwork {
this.bias_o.map(mutate);
}

static crossover(a, b, ratio = 0.5) {
if (!a instanceof this || !b instanceof this || a.input_nodes !== b.input_nodes || a.hidden_nodes !== b.hidden_nodes || a.output_nodes !== b.output_nodes) {
console.error('Only NeuralNetworks of the same breed can generate offspring.');
return;
}

let nn = a.copy();
nn.weights_ih = Matrix.crossover(a.weights_ih, b.weights_ih, ratio);
nn.weights_ho = Matrix.crossover(a.weights_ho, b.weights_ho, ratio);
nn.bias_h = Matrix.crossover(a.bias_h, b.bias_h, ratio);
nn.bias_o = Matrix.crossover(a.bias_o, b.bias_o, ratio);
return nn;
}


}