1 files changed, 36 insertions, 0 deletions
diff --git a/examples/src/main/scala/LocalFileLR.scala b/examples/src/main/scala/LocalFileLR.scala
new file mode 100644
index 0000000000..3d3bb60677
--- /dev/null
+++ b/examples/src/main/scala/LocalFileLR.scala
@@ -0,0 +1,36 @@
+import java.util.Random
+import Vector._
+
+object LocalFileLR {
+  val D = 10   // Numer of dimensions
+  val rand = new Random(42)
+
+  case class DataPoint(x: Vector, y: Double)
+
+  def parsePoint(line: String): DataPoint = {
+    val nums = line.split(' ').map(_.toDouble)
+    return DataPoint(new Vector(nums.slice(1, D+1)), nums(0))
+  }
+
+  def main(args: Array[String]) {
+    val lines = scala.io.Source.fromFile(args(0)).getLines()
+    val points = lines.map(parsePoint _)
+    val ITERATIONS = args(1).toInt
+
+    // Initialize w to a random value
+    var w = Vector(D, _ => 2 * rand.nextDouble - 1)
+    println("Initial w: " + w)
+
+    for (i <- 1 to ITERATIONS) {
+      println("On iteration " + i)
+      var gradient = Vector.zeros(D)
+      for (p <- points) {
+        val scale = (1 / (1 + Math.exp(-p.y * (w dot p.x))) - 1) * p.y
+        gradient +=  scale * p.x
+      }
+      w -= gradient
+    }
+
+    println("Final w: " + w)
+  }
+}