From 96744a133f3d421cdfcd9d18dd5f74981475fd5f Mon Sep 17 00:00:00 2001
From: schneefux <schneefux+commit@schneefux.xyz>
Date: Sat, 2 Apr 2016 21:33:19 +0200
Subject: integrate boston housing dataset and test values

---
 code/weightvis.js | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'code/weightvis.js')

diff --git a/code/weightvis.js b/code/weightvis.js
index 64d398c..e3cec42 100644
--- a/code/weightvis.js
+++ b/code/weightvis.js
@@ -33,9 +33,9 @@ var
     nodeHighlightColor    = accentColor
 ;
 
-
 /* network construction */
 
+// TODO make multiple bias layers at positions > 0 possible?
 var Network = (function() {
     function Network(layout) {
         this.layout = layout;
@@ -499,9 +499,35 @@ var NetVisualizer = (function() {
                     me.attr("data-highlight", "true");
                 }
             });
-
         this.reposition();
     };
 
+    NetVisualizer.prototype.activate = function(inputs) {
+        // assumes the sigmoid function is used as activation
+        function activation(x) { return 0.5 + x / Math.sqrt(1 + 4 * x * x); }
+        var weights = this.data[this.layout.data.batches-1][this.layout.data.epochs-1];
+        var lastLayerOut = inputs;
+        var hasBias = false;
+        if (this.layout.net[0].isBias) {
+            for (bias=0; bias<inputs.length; bias++) {
+                lastLayerOut[bias] += weights[0][0][bias];
+            }
+            hasBias = true;
+        }
+        for (layer=hasBias?1:0; layer<this.layout.net.layers-1; layer++) {
+            // manual vector matrix multiplication
+            var thisLayerOut = [];
+            for (tar=0; tar<this.layout.net[layer+1].size; tar++) {
+                thisLayerOut[tar] = 0;
+                for (src=0; src<this.layout.net[layer].size; src++) {
+                    thisLayerOut[tar] += weights[layer][src][tar] * lastLayerOut[src];
+                }
+                thisLayerOut[tar] = activation(thisLayerOut[tar]);
+            }
+            lastLayerOut = thisLayerOut;
+        }
+        return lastLayerOut;
+    };
+
     return NetVisualizer;
 })();
-- 
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