wehub-resource-sync
65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
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// contains various utility functions
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var cnnutil = (function(exports){
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// a window stores _size_ number of values
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// and returns averages. Useful for keeping running
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// track of validation or training accuracy during SGD
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var Window = function(size, minsize) {
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this.v = [];
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this.size = typeof(size)==='undefined' ? 100 : size;
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this.minsize = typeof(minsize)==='undefined' ? 20 : minsize;
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this.sum = 0;
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}
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Window.prototype = {
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add: function(x) {
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this.v.push(x);
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this.sum += x;
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if(this.v.length>this.size) {
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var xold = this.v.shift();
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this.sum -= xold;
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}
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},
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get_average: function() {
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if(this.v.length < this.minsize) return -1;
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else return this.sum/this.v.length;
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},
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reset: function(x) {
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this.v = [];
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this.sum = 0;
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}
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}
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// returns min, max and indeces of an array
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var maxmin = function(w) {
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if(w.length === 0) { return {}; } // ... ;s
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var maxv = w[0];
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var minv = w[0];
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var maxi = 0;
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var mini = 0;
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for(var i=1;i<w.length;i++) {
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if(w[i] > maxv) { maxv = w[i]; maxi = i; }
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if(w[i] < minv) { minv = w[i]; mini = i; }
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}
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return {maxi: maxi, maxv: maxv, mini: mini, minv: minv, dv:maxv-minv};
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}
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// returns string representation of float
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// but truncated to length of d digits
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var f2t = function(x, d) {
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if(typeof(d)==='undefined') { var d = 5; }
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var dd = 1.0 * Math.pow(10, d);
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return '' + Math.floor(x*dd)/dd;
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}
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exports = exports || {};
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exports.Window = Window;
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exports.maxmin = maxmin;
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exports.f2t = f2t;
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return exports;
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})(typeof module != 'undefined' && module.exports); // add exports to module.exports if in node.js
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