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'use strict';
import { network } from '../mind/topology';
// check if a given genome is valid and compute its size
export function get_size(num_input, num_output, genome) {
const [ max_index, max_weight ] = genome.reduce(
([max_index, max_weight ], [ source, sink, weight]) => [
Math.max(max_index, source, sink),
Math.max(max_weight, Math.abs(weight)),
],
[ 0, 0 ]
);
if (max_index < num_input + num_output - 1) {
return -1;
}
else if (max_weight > 4.0) {
return -1;
}
else {
return max_index + 1;
}
}
export function parse_genome(num_input, num_output, genome) {
const size = get_size(num_input, num_output, genome);
if (size < 0) {
// bad genome
throw new Error('invalid genome sequence!');
}
const n = genome.reduce(
(acc, [source, sink, weight]) => acc.connect(source, sink, weight),
network(num_input, size-num_input-num_output, num_output)
);
return n;
}
// --===== mutations =====--
function clamp(value, min, max) {
if (value > max) { return max; }
if (value < min) { return min; }
return value;
}
export function mut_gene_source(n_input, n_internal, n_output, gene, r) {
const [source, sink, weight] = gene;
const new_source = r < 0.5 ? source-1 : source+1;
return [
clamp(new_source, 0, n_input+n_internal-1),
sink,
weight,
];
}
export function mut_gene_sink(n_input, n_internal, n_output, gene, r) {
const [source, sink, weight] = gene;
const new_sink = r < 0.5 ? sink-1 : sink+1;
return [
source,
clamp(new_sink, n_input+n_internal, n_input+n_internal+n_output-1),
weight,
];
}
export function mut_gene_weight(weight_max, gene, r) {
const [source, sink, weight] = gene;
const rr = (2*r)-1;
const move = weight_max * rr;
const new_weight = (2*weight + move)/3;
return [
source,
sink,
clamp(new_weight, -weight_max, weight_max),
];
}
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