Restore trained stroke extractor

lib/classifier.js

@@ -0,0 +1,19 @@
+"use strict";
+
+Meteor.startup(() => {
+  const input = new convnetjs.Vol(1, 1, 8 /* feature vector dimensions */);
+  const net = new convnetjs.Net();
+  net.fromJSON(NEURAL_NET_TRAINED_FOR_STROKE_EXTRACTION);
+  const weight = 0.8;
+
+  const trainedClassifier = (features) => {
+    input.w = features;
+    const softmax = net.forward(input).w;
+    return softmax[1] - softmax[0];
+  }
+
+  stroke_extractor.combinedClassifier = (features) => {
+    return stroke_extractor.handTunedClassifier(features) +
+           weight*trainedClassifier(features);
+  }
+});