From 03a5ad963ee381eaee1de24d1def52bba9b71736 Mon Sep 17 00:00:00 2001
From: txh18 <cloudygooseg@gmail.com>
Date: Mon, 16 Nov 2015 20:14:02 +0800
Subject: unified param updates, now direct_update is the same speed with
 undirect_update

---
 nerv/layer/affine.lua | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

(limited to 'nerv/layer/affine.lua')

diff --git a/nerv/layer/affine.lua b/nerv/layer/affine.lua
index 0fcff36..c24af16 100644
--- a/nerv/layer/affine.lua
+++ b/nerv/layer/affine.lua
@@ -19,14 +19,33 @@ end
 
 function MatrixParam:update(gradient)
     local gconf = self.gconf
-    self.correction:add(self.correction, gradient, gconf.momentum, 1.0)
-    -- momentum gain
-    local mmt_gain = 1.0 / (1.0 - gconf.momentum);
-    local n = self.gconf.batch_size * mmt_gain
-    -- perform update
-    self.trans:add(self.trans, self.correction, 1.0 - gconf.lrate*gconf.wcost/gconf.batch_size, -gconf.lrate / n)
+    if (gconf.momentum > 0) then
+        self.correction:add(self.correction, gradient, gconf.momentum, 1.0)
+        -- momentum gain
+        local mmt_gain = 1.0 / (1.0 - gconf.momentum);
+        local n = self.gconf.batch_size * mmt_gain
+        -- perform update
+        self.trans:add(self.trans, self.correction, 1.0-gconf.lrate*gconf.wcost/gconf.batch_size, -gconf.lrate/n)
+    else
+        self.trans:add(self.trans, gradient, 1.0-gconf.lrate*gconf.wcost/gconf.batch_size, -gconf.lrate/gconf.batch_size)
+    end
+end
+
+function MatrixParam:updateEI(err, input)
+    local gconf = self.gconf
+    if (gconf.momentum > 0) then
+        self.correction:mul(input, err, 1.0, gconf.momentum, 'T', 'N')
+        -- momentum gain
+        local mmt_gain = 1.0 / (1.0 - gconf.momentum);
+        local n = self.gconf.batch_size * mmt_gain
+        -- perform update
+        self.trans:add(self.trans, self.correction, 1.0-gconf.lrate*gconf.wcost/gconf.batch_size, -gconf.lrate/n)
+    else
+        self.trans:mul(input, err, -gconf.lrate/gconf.batch_size, 1.0-gconf.lrate*gconf.wcost/gconf.batch_size, 'T', 'N')
+    end
 end
 
+--[[ --these updates are the same
 function LinearTransParam:update(gradient)
     MatrixParam.update(self, gradient)
     -- local gconf = self.gconf
@@ -36,10 +55,11 @@ end
 
 function BiasParam:update(gradient)
     MatrixParam.update(self, gradient)
-    -- local gconf = self.gconf
+    --local gconf = self.gconf
     -- weight decay
     -- self.trans:add(self.trans, self.trans, 1.0, -gconf.lrate * gconf.wcost / gconf.batch_size)
 end
+]]--
 
 function AffineLayer:__init(id, global_conf, layer_conf)
     self.id = id
@@ -88,8 +108,7 @@ function AffineLayer:update(bp_err, input, output)
             self.bp.trans:add(self.bp.trans, bp_err[1]:colsum(), 1.0-gconf.lrate*gconf.wcost/gconf.batch_size, -gconf.lrate / gconf.batch_size)
         end
     else
-        self.ltp_grad:mul(input[1], bp_err[1], 1.0, 0.0, 'T', 'N')
-        self.ltp:update(self.ltp_grad)
+        self.ltp:updateEI(bp_err[1], input[1])
         self.bp:update(bp_err[1]:colsum())
     end
 end
-- 
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