add implementation for sigmoid layer (not tested)

1 files changed, 14 insertions, 0 deletions

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