add implementation for sigmoid layer (not tested)

2 files changed, 15 insertions, 0 deletions

diff --git a/layer/affine.lua b/layer/affine.lua
index 221aacd..94e7497 100644
--- a/layer/affine.lua
+++ b/layer/affine.lua
@@ -11,6 +11,7 @@ function LinearTransParam:write(pfhandle)
 end
 
 function AffineLayer:__init(id, global_conf, ltp, bp)
+    self.id = id
     self.ltp = ltp
     self.bp = bp
     self.gconf = global_conf
diff --git a/layer/sigmoid.lua b/layer/sigmoid.lua
new file mode 100644
index 0000000..d69e9e3
--- /dev/null
+++ b/layer/sigmoid.lua
@@ -0,0 +1,14 @@
+local SigmoidLayer = nerv.class("nerv.SigmoidLayer", "nerv.Layer")
+
+function SigmoidLayer:__init(id, global_conf)
+    self.id = id
+    self.gconf = global_conf
+end
+
+function SigmoidLayer:propagate(input, output)
+    output:sigmoid(input)
+end
+
+function SigmoidLayer:back_propagate(next_bp_err, bp_err, input, output)
+    next_bp_err:sigmoid(bp_err, output)
+end