From a27036119247fd5527ab8222e7df80ec2df31ca2 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Mon, 14 Nov 2011 01:20:50 +0100
Subject: l1 regularzation

---
 dtrain/dtrain.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'dtrain/dtrain.h')

diff --git a/dtrain/dtrain.h b/dtrain/dtrain.h
index 84f3f1f5..cfc3f460 100644
--- a/dtrain/dtrain.h
+++ b/dtrain/dtrain.h
@@ -85,5 +85,11 @@ inline void printWordIDVec(vector<WordID>& v)
   }
 }
 
+template<typename T>
+inline T sign(T z) {
+  if (z == 0) return 0;
+  return z < 0 ? -1 : +1;
+}
+
 #endif
 
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