{"id":765,"date":"2026-05-31T10:45:55","date_gmt":"2026-05-31T08:45:55","guid":{"rendered":"https:\/\/kiube.se\/idea\/?p=765"},"modified":"2026-05-31T10:45:55","modified_gmt":"2026-05-31T08:45:55","slug":"765","status":"publish","type":"post","link":"https:\/\/kiube.se\/idea\/?p=765","title":{"rendered":""},"content":{"rendered":"<div id=\"nn-container\"><canvas id=\"nnCanvas\" width=\"900\" height=\"500\"><\/canvas><\/p>\n<p><button>Tr\u00e4na 100 steg<\/button><br \/>\n<button>\u00c5terst\u00e4ll<\/button>Fel: <span id=\"loss\">0<\/span><\/p>\n<\/div>\n<p><script><\/p>\n<p>const canvas = document.getElementById('nnCanvas');\nconst ctx = canvas.getContext('2d');<\/p>\n<p>let w = {\n    i1h1: Math.random()*2-1,\n    i2h1: Math.random()*2-1,\n    i1h2: Math.random()*2-1,\n    i2h2: Math.random()*2-1,<\/p>\n<p>    h1o: Math.random()*2-1,\n    h2o: Math.random()*2-1\n};<\/p>\n<p>const trainingData = [\n    {x:[0,0], y:0},\n    {x:[0,1], y:1},\n    {x:[1,0], y:1},\n    {x:[1,1], y:0}\n];<\/p>\n<p>function sigmoid(x){\n    return 1\/(1+Math.exp(-x));\n}<\/p>\n<p>function forward(x1,x2){<\/p>\n<p>    let h1 =\n        sigmoid(x1*w.i1h1 +\n                x2*w.i2h1);<\/p>\n<p>    let h2 =\n        sigmoid(x1*w.i1h2 +\n                x2*w.i2h2);<\/p>\n<p>    let out =\n        sigmoid(h1*w.h1o +\n                h2*w.h2o);<\/p>\n<p>    return {h1,h2,out};\n}<\/p>\n<p>function train(){<\/p>\n<p>    for(let epoch=0; epoch<100; epoch++){ let sample = trainingData[ Math.floor( Math.random()*4)]; let x1 = sample.x[0]; let x2 = sample.x[1]; let target = sample.y; let {h1,h2,out} = forward(x1,x2); let error = target - out; let lr = 0.2; w.h1o += lr*error*h1; w.h2o += lr*error*h2; w.i1h1 += lr*error*x1; w.i2h1 += lr*error*x2; w.i1h2 += lr*error*x1; w.i2h2 += lr*error*x2; } render(); } function line(x1,y1,x2,y2,weight){ ctx.beginPath(); ctx.moveTo(x1,y1); ctx.lineTo(x2,y2); let thickness = Math.abs(weight)*8+1; ctx.lineWidth = thickness; if(weight > 0)\n        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line(\n        h1.x,h1.y,\n        out.x,out.y,\n        w.h1o);<\/p>\n<p>    line(\n        h2.x,h2.y,\n        out.x,out.y,\n        w.h2o);<\/p>\n<p>    neuron(in1.x,in1.y,\"I1\");\n    neuron(in2.x,in2.y,\"I2\");<\/p>\n<p>    neuron(h1.x,h1.y,\"H1\");\n    neuron(h2.x,h2.y,\"H2\");<\/p>\n<p>    neuron(out.x,out.y,\"O\");<\/p>\n<p>    let loss=0;<\/p>\n<p>    trainingData.forEach(t=>{<\/p>\n<p>        let p=\n            forward(\n                t.x[0],\n                t.x[1]\n            ).out;<\/p>\n<p>        loss +=\n            Math.pow(\n                t.y-p,2);\n    });<\/p>\n<p>    loss\/=4;<\/p>\n<p>    document\n      .getElementById(\"loss\")\n      .innerHTML=\n      loss.toFixed(4);\n}<\/p>\n<p>function resetNetwork(){<\/p>\n<p>    Object.keys(w)\n    .forEach(k=>{<\/p>\n<p>        w[k]=\n        Math.random()*2-1;<\/p>\n<p>    });<\/p>\n<p>    render();\n}<\/p>\n<p>render();<\/p>\n<p><\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tr\u00e4na 100 steg 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