1 files changed, 26 insertions, 0 deletions
diff --git a/Mean.lua b/Mean.lua
new file mode 100644
index 0000000..55e7609
--- /dev/null
+++ b/Mean.lua
@@ -0,0 +1,26 @@
+local Mean, parent = torch.class('nn.Mean', 'nn.Module')
+
+function Mean:__init(dimension)
+   parent.__init(self)
+   dimension = dimension or 1
+   self.dimension = dimension
+end
+
+function Mean:updateOutput(input)
+   input.torch.mean(self.output, input, self.dimension)
+   self.output = self.output:select(self.dimension, 1)
+   return self.output
+end
+
+function Mean:updateGradInput(input, gradOutput)
+   local size = gradOutput:size():totable()
+   local stride = gradOutput:stride():totable()
+   table.insert(size, self.dimension, input:size(self.dimension))
+   table.insert(stride, self.dimension, 0)
+
+   self.gradInput:resizeAs(gradOutput):copy(gradOutput)
+   self.gradInput:mul(1/input:size(self.dimension))
+   self.gradInput:resize(torch.LongStorage(size), torch.LongStorage(stride))
+
+   return self.gradInput
+end