From 882541b311ae9f18c916609a74708cb29bc1abdd Mon Sep 17 00:00:00 2001
From: cloudygoose <cloudygooseg@gmail.com>
Date: Fri, 10 Jul 2015 11:09:42 +0800
Subject: added affine_recurrent layer

---
 .gitignore                      |  1 +
 nerv/Makefile                   |  4 +-
 nerv/layer/affine_recurrent.lua | 83 +++++++++++++++++++++++++++++++++++++++++
 nerv/layer/init.lua             |  1 +
 4 files changed, 87 insertions(+), 2 deletions(-)
 create mode 100644 nerv/layer/affine_recurrent.lua

diff --git a/.gitignore b/.gitignore
index 24f2f11..5c87b71 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.o
 install/
+build/
 *.swp
 *.swo
diff --git a/nerv/Makefile b/nerv/Makefile
index 7b75522..022e2fb 100644
--- a/nerv/Makefile
+++ b/nerv/Makefile
@@ -31,9 +31,9 @@ OBJS := $(CORE_OBJS) $(NERV_OBJS) $(LUAT_OBJS)
 LIBS := $(INST_LIBDIR)/libnerv.so $(LIB_PATH)/libnervcore.so $(LIB_PATH)/libluaT.so
 LUA_LIBS := matrix/init.lua io/init.lua init.lua \
 			layer/init.lua layer/affine.lua layer/sigmoid.lua layer/softmax_ce.lua \
-			layer/window.lua layer/bias.lua layer/combiner.lua layer/mse.lua \
+			layer/window.lua layer/bias.lua layer/combiner.lua layer/mse.lua layer/affine_recurrent.lua\
 			nn/init.lua nn/layer_repo.lua nn/param_repo.lua nn/layer_dag.lua \
-			io/sgd_buffer.lua
+			io/sgd_buffer.lua 
 
 INCLUDE := -I $(LUA_INCDIR) -DLUA_USE_APICHECK
 CUDA_BASE := /usr/local/cuda-6.5
diff --git a/nerv/layer/affine_recurrent.lua b/nerv/layer/affine_recurrent.lua
new file mode 100644
index 0000000..5afdaa1
--- /dev/null
+++ b/nerv/layer/affine_recurrent.lua
@@ -0,0 +1,83 @@
+local Recurrent = nerv.class('nerv.AffineRecurrentLayer', 'nerv.Layer')
+
+--id: string
+--global_conf: table
+--layer_conf: table
+--Get Parameters
+function Recurrent:__init(id, global_conf, layer_conf)
+    self.id = id
+    self.dim_in = layer_conf.dim_in
+    self.dim_out = layer_conf.dim_out
+    self.gconf = global_conf
+
+    self.bp = layer_conf.bp
+    self.ltp_hh = layer_conf.ltp_hh --from hidden to hidden
+    
+    self:check_dim_len(2, 1)
+    self.direct_update = layer_conf.direct_update
+end
+
+--Check parameter 
+function Recurrent:init(batch_size)
+    if (self.ltp_hh.trans:ncol() ~= self.bp.trans:ncol()) then
+        nerv.error("mismatching dimensions of ltp and bp")
+    end
+    if (self.dim_in[1] ~= self.ltp_hh.trans:nrow() or
+        self.dim_in[2] ~= self.ltp_hh.trans:nrow()) then
+        nerv.error("mismatching dimensions of ltp and input")
+    end
+    if (self.dim_out[1] ~= self.bp.trans:ncol()) then
+        nerv.error("mismatching dimensions of bp and output")
+    end
+    
+    self.ltp_hh_grad = self.ltp_hh.trans:create()
+    self.ltp_hh:train_init()
+    self.bp:train_init()
+end
+
+function Recurrent:update(bp_err, input, output)
+    if (self.direct_update == true) then
+        local ltp_hh = self.ltp_hh.trans
+        local bp = self.bp.trans
+        local gconf = self.gconf
+        -- momentum gain
+        local mmt_gain = 1.0 / (1.0 - gconf.momentum);
+        local n = input[1]:nrow() * mmt_gain
+        -- update corrections (accumulated errors)
+        self.ltp_hh.correction:mul(input[2], bp_err[1], 1.0, gconf.momentum, 'T', 'N')
+        self.bp.correction:add(bc, bp_err[1]:colsum(), gconf.momentum, 1.0)
+        -- perform update
+        ltp_hh:add(ltp_hh, self.ltp_hh.correction, 1.0, -gconf.lrate / n)
+        bp:add(bp, self.bp.correction, 1.0, -gconf.lrate / n)
+        -- weight decay
+        ltp_hh:add(ltp_hh, ltp_hh, 1.0, -gconf.lrate * gconf.wcost)
+    else
+        self.ltp_hh_grad:mul(input[2], bp_err[1], 1.0, 0.0, 'T', 'N') 
+        self.ltp_hh:update(self.ltp_hh_grad)       
+        self.bp:update(bp_err[1]:colsum())
+    end
+end
+
+function Recurrent:propagate(input, output)
+    output[1]:copy_fromd(input[1])
+    output[1]:mul(input[2], self.ltp_hh.trans, 1.0, 1.0, 'N', 'N')
+    output[1]:add_row(self.bp.trans, 1.0)
+end
+
+function Recurrent:back_propagate(bp_err, next_bp_err, input, output)
+    next_bp_err[1]:copy_fromd(bp_err[1])
+    next_bp_err[2]:mul(bp_err[1], self.ltp_hh.trans, 1.0, 0.0, 'N', 'T')
+    --[[
+    for i = 0, next_bp_err[2]:nrow() - 1 do
+        for j = 0, next_bp_err[2]:ncol() - 1 do
+            if (next_bp_err[2][i][j] > 10) then next_bp_err[2][i][j] = 10 end
+            if (next_bp_err[2][i][j] < -10) then next_bp_err[2][i][j] = -10 end
+        end
+    end
+    ]]--
+    next_bp_err[2]:clip(-10, 10)
+end
+
+function Recurrent:get_params()
+    return nerv.ParamRepo({self.ltp_hh, self.bp})
+end
diff --git a/nerv/layer/init.lua b/nerv/layer/init.lua
index 3c55a94..7172f99 100644
--- a/nerv/layer/init.lua
+++ b/nerv/layer/init.lua
@@ -77,3 +77,4 @@ nerv.include('bias.lua')
 nerv.include('window.lua')
 nerv.include('mse.lua')
 nerv.include('combiner.lua')
+nerv.include('affine_recurrent.lua')
-- 
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