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jsdoでtensorflow.js その7

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概要

jsdoでtensorflow.jsやってみた。
学習したウェイトとバイアスを使って、tensorflow.jsを使わないでsinを回帰してみた。

写真

サンプルコード

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
function draw(data, n) {
    var hc = n * 100 + 100;
    ctx.strokeStyle = "#f00";
    ctx.lineWidth = 1;
    ctx.moveTo(0, hc);
    for (var i = 1; i < 20; i++) 
    {
        ctx.lineTo(i * 10, hc - data[i] * 30);
    }
    ctx.stroke();
}
const tx = [];
const ty = [];
for (var i = 0; i < 20; i++) 
{
    var x = i / 3.0;    
    var y = Math.sin(x);
    tx.push(x);
    ty.push(y);
}
draw(ty, 0);

var w1 = [0.6203325, -1.027319, 1.8841791, -3.2817535, 1.2214272, 0.9679314, 1.4196726, 7.171823, 1.3714954, 3.7268815, 0.0598045, 1.1944624];
var b1 = [1.1656082, -2.0180476, -6.9387307, 3.3653135, -1.7032033, -2.8969588, 0.0565524, -9.5316219, -5.7146306, -2.8060255, -0.3085915, -6.3642092];
var w2 = [-1.2655445, -1.0401167, 0.2071615, -0.4695872, -2.6633599, -0.5835096, 1.2490041, 1.2825323, -1.5088843, 0.6767025, 0.0224434, 1.6849496];
var b2 = -0.2928229;
function tanh(x) {
    if (x > 20) return 1;
    else if (x < -20) return -1;
    else
    {
        var a = Math.exp(x);
        var b = Math.exp(-x);
        return (a - b) / (a + b);
    }
}

var i;
var j;
var y = [];
for (i = 0; i < 20; i++)
{
    var x = i / 3.0;
    var sum = 0;
    var d = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    for (j = 0; j < 12; j++)
    {
        d[j] += w1[j] * x + b1[j];
    }
    for (j = 0; j < 12; j++)
    {    
        d[j] = tanh(d[j]);
    }
    for (j = 0; j < 12; j++)
    {
        sum += w2[j] * d[j];
    }
    sum += b2;
    sum = tanh(sum);
    y.push(sum);
}
draw(y, 1);



成果物

以上。

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