From e934b616496940bfe0924ca1992035d2346baa62 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Thu, 28 May 2015 17:01:10 +0800
Subject: add softmax + ce layer; test_dnn_layers produces the same result as
 TNet

---
 Makefile                     |  2 +-
 examples/test_dnn_layers.lua | 74 ++++++++++++++++++++++++++++++++++++++++++++
 layer/sigmoid.lua            |  3 ++
 layer/softmax_ce.lua         | 32 +++++++++++++++++++
 4 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 examples/test_dnn_layers.lua
 create mode 100644 layer/softmax_ce.lua

diff --git a/Makefile b/Makefile
index 727765d..d403e8f 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ OBJS := nerv.o luaT.o common.o \
 LIBS := libnerv.so
 LUA_LIBS := matrix/init.lua io/init.lua nerv.lua \
 			pl/utils.lua pl/compat.lua \
-			layer/init.lua layer/affine.lua layer/sigmoid.lua
+			layer/init.lua layer/affine.lua layer/sigmoid.lua layer/softmax_ce.lua
 INCLUDE := -I build/luajit-2.0/include/luajit-2.0/ -DLUA_USE_APICHECK
 CUDA_BASE := /usr/local/cuda-6.5
 CUDA_INCLUDE := -I $(CUDA_BASE)/include/
diff --git a/examples/test_dnn_layers.lua b/examples/test_dnn_layers.lua
new file mode 100644
index 0000000..c57de6d
--- /dev/null
+++ b/examples/test_dnn_layers.lua
@@ -0,0 +1,74 @@
+require 'layer.affine'
+require 'layer.sigmoid'
+require 'layer.softmax_ce'
+
+global_conf = {lrate = 0.8, wcost = 1e-6, momentum = 0.9}
+
+pf = nerv.ParamFile("affine.param", "r")
+ltp = pf:read_param("a")
+bp = pf:read_param("b")
+
+-- print(bp.trans)
+
+af = nerv.AffineLayer("test", global_conf, ltp, bp)
+sg = nerv.SigmoidLayer("test2", global_conf)
+sm = nerv.SoftmaxCELayer("test3", global_conf)
+
+af:init()
+sg:init()
+sm:init()
+
+df = nerv.ParamFile("input.param", "r")
+
+label = nerv.CuMatrixFloat(10, 2048)
+label:fill(0)
+for i = 0, 9 do
+    label[i][i] = 1.0
+end
+
+input1 = {[0] = df:read_param("input").trans}
+output1 = {[0] = nerv.CuMatrixFloat(10, 2048)}
+input2 = output1
+output2 = {[0] = nerv.CuMatrixFloat(10, 2048)}
+input3 = {[0] = output2[0], [1] = label}
+output3 = nil
+err_input1 = nil
+err_output1 = {[0] = nerv.CuMatrixFloat(10, 2048)}
+err_input2 = err_output1
+err_output2 = {[0] = nerv.CuMatrixFloat(10, 2048)}
+err_input3 = err_output2
+err_output3 = {[0] = input1[0]:create()}
+
+for i = 0, 3 do
+    -- propagate
+    af:propagate(input1, output1)
+    sg:propagate(input2, output2)
+    sm:propagate(input3, output3)
+
+
+    -- back_propagate
+    sm:back_propagate(err_output1, err_input1, input3, output3)
+    sm:update(err_input1, input3, output3)
+
+    sg:back_propagate(err_output2, err_input2, input2, output2)
+    sg:update(err_input2, input2, output2)
+
+    af:back_propagate(err_output3, err_input3, input1, output1)
+    af:update(err_input3, input1, output1)
+
+
+    print("output1")
+    print(output1[0])
+    print("output2")
+    print(output2[0])
+    print("err_output1")
+    print(err_output1[0])
+    print("err_output2")
+    print(err_output2[0])
+    nerv.utils.printf("cross entropy: %.8f\n", sm.total_ce)
+    nerv.utils.printf("frames: %.8f\n", sm.total_frames)
+end
+print("linear")
+print(af.ltp.trans)
+print("linear2")
+print(af.bp.trans)
diff --git a/layer/sigmoid.lua b/layer/sigmoid.lua
index 41a6ef7..ca34419 100644
--- a/layer/sigmoid.lua
+++ b/layer/sigmoid.lua
@@ -5,6 +5,9 @@ function SigmoidLayer:__init(id, global_conf)
     self.gconf = global_conf
 end
 
+function SigmoidLayer:init()
+end
+
 function SigmoidLayer:update(bp_err, input, output)
     -- no params, therefore do nothing
 end
diff --git a/layer/softmax_ce.lua b/layer/softmax_ce.lua
new file mode 100644
index 0000000..37d2864
--- /dev/null
+++ b/layer/softmax_ce.lua
@@ -0,0 +1,32 @@
+local SoftmaxCELayer = nerv.class("nerv.SoftmaxCELayer", "nerv.Layer")
+
+function SoftmaxCELayer:__init(id, global_conf)
+    self.id = id
+    self.gconf = global_conf
+end
+
+function SoftmaxCELayer:init()
+    self.total_ce = 0.0
+    self.total_frames = 0
+end
+
+function SoftmaxCELayer:update(bp_err, input, output)
+    -- no params, therefore do nothing
+end
+
+function SoftmaxCELayer:propagate(input, output)
+    local soutput = input[0]:create()  -- temporary value for calc softmax
+    self.soutput = soutput
+    soutput:softmax(input[0])
+    local ce = soutput:create()
+    ce:log_elem(soutput)
+    ce:mul_elem(ce, input[1])
+     -- add total ce
+    self.total_ce = self.total_ce - ce:rowsum():colsum()[0]
+    self.total_frames = self.total_frames + soutput:nrow()
+end
+
+function SoftmaxCELayer:back_propagate(next_bp_err, bp_err, input, output)
+    -- softmax output - label
+    next_bp_err[0]:add(self.soutput, input[1], 1.0, -1.0)
+end
-- 
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