1 files changed, 20 insertions, 0 deletions
diff --git a/contrib/lua-torch/nn/Log.lua b/contrib/lua-torch/nn/Log.lua
new file mode 100644
index 000000000..e8f236bfb
--- /dev/null
+++ b/contrib/lua-torch/nn/Log.lua
@@ -0,0 +1,20 @@
+local Log, parent = torch.class('nn.Log', 'nn.Module')
+
+function Log:__init()
+   parent.__init(self)
+end
+
+function Log:updateOutput(input)
+   self.output:resizeAs(input)
+   self.output:copy(input)
+   self.output:log()
+   return self.output
+end
+
+function Log:updateGradInput(input, gradOutput)
+   self.gradInput:resizeAs(input)
+   self.gradInput:fill(1)
+   self.gradInput:cdiv(input)
+   self.gradInput:cmul(gradOutput)
+   return self.gradInput
+end