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Fixed LRN layer #69

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Fixed LRN layer #69

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64 changes: 35 additions & 29 deletions src/convnet_layers_normalization.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,24 +29,27 @@

var A = V.cloneAndZero();
this.S_cache_ = V.cloneAndZero();
var n2 = Math.floor(this.n/2);
for(var x=0;x<V.sx;x++) {
for(var y=0;y<V.sy;y++) {
for(var i=0;i<V.depth;i++) {
var n2 = Math.floor(this.n / 2);
for (var x = 0; x < V.sx; x++) {
for (var y = 0; y < V.sy; y++) {
for (var i = 0; i < V.depth; i++) {

var ai = V.get(x,y,i);
var a_i = V.get(x, y, i);
var f0 = this.k;
var f1 = this.alpha / this.n;
var sum = 0.0;

// normalize in a window of size n
var den = 0.0;
for(var j=Math.max(0,i-n2);j<=Math.min(i+n2,V.depth-1);j++) {
var aa = V.get(x,y,j);
den += aa*aa;
for (var j = Math.max(0, i - n2); j <= Math.min(i + n2, V.depth - 1); j++) {
var aa = V.get(x, y, j);
sum += aa * aa;
}
den *= this.alpha / this.n;
den += this.k;
this.S_cache_.set(x,y,i,den); // will be useful for backprop
den = Math.pow(den, this.beta);
A.set(x,y,i,ai/den);

// will be useful for backprop
var scale_i = f0 + f1 * sum;
this.S_cache_.set(x, y, i, scale_i);
var b_i = a_i * Math.pow(scale_i, -this.beta);
A.set(x, y, i, b_i);
}
}
}
Expand All @@ -60,26 +63,29 @@
V.dw = global.zeros(V.w.length); // zero out gradient wrt data
var A = this.out_act; // computed in forward pass

var n2 = Math.floor(this.n/2);
for(var x=0;x<V.sx;x++) {
for(var y=0;y<V.sy;y++) {
for(var i=0;i<V.depth;i++) {
var n2 = Math.floor(this.n / 2);
for (var x = 0; x < V.sx; x++) {
for (var y = 0; y < V.sy; y++) {
for (var i = 0; i < V.depth; i++) {

var chain_grad = this.out_act.get_grad(x,y,i);
var S = this.S_cache_.get(x,y,i);
var SB = Math.pow(S, this.beta);
var SB2 = SB*SB;
var scale_i = this.S_cache_.get(x, y, i);
var a_i = V.get(x, y, i);
var be_i = A.get_grad(x, y, i);
var f0 = Math.pow(scale_i, -this.beta) * be_i;
var f1 = 2.0 * this.alpha * this.beta / this.n * a_i;
var sum = 0.0;

// normalize in a window of size n
for(var j=Math.max(0,i-n2);j<=Math.min(i+n2,V.depth-1);j++) {
var aj = V.get(x,y,j);
var g = -aj*this.beta*Math.pow(S,this.beta-1)*this.alpha/this.n*2*aj;
if(j===i) g+= SB;
g /= SB2;
g *= chain_grad;
V.add_grad(x,y,j,g);
for (var j = Math.max(0, i - n2); j <= Math.min(i + n2, V.depth - 1); j++) {
var b_j = A.get(x, y, j);
var be_j = A.get_grad(x, y, j);
var scale_j = this.S_cache_.get(x, y, j);

sum += be_j * b_j / scale_j;
}

var ae_i = f0 - f1 * sum;
V.set_grad(x, y, i, ae_i);
}
}
}
Expand Down