From 71d092dc0474321803efd54473377bf8920e76f9 Mon Sep 17 00:00:00 2001
From: soumith <soumith@fb.com>
Date: Thu, 26 Feb 2015 16:09:00 -0800
Subject: cudnn.SoftMax now supports 1D and 2D inputs

---
 SpatialSoftMax.lua | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

(limited to 'SpatialSoftMax.lua')

diff --git a/SpatialSoftMax.lua b/SpatialSoftMax.lua
index 87af4d5..97c1e38 100644
--- a/SpatialSoftMax.lua
+++ b/SpatialSoftMax.lua
@@ -14,7 +14,15 @@ end
 
 function SpatialSoftMax:createIODescriptors(input)
    local batch = true
-   if input:dim() == 3 then
+   local singleDim = false
+   if input:dim() == 1 then
+      singleDim = true
+      batch = false
+      input = input:view(1, input:size(1), 1, 1)
+   elseif input:dim() == 2 then
+      singleDim = true
+      input = input:view(input:size(1), input:size(2), 1, 1)
+   elseif input:dim() == 3 then
       input = input:view(1, input:size(1), input:size(2), input:size(3))
       batch = false
    end
@@ -27,13 +35,19 @@ function SpatialSoftMax:createIODescriptors(input)
       self.output:resizeAs(input)
       self.iDesc = cudnn.toDescriptor(input)
       self.oDesc = cudnn.toDescriptor(self.output)
-      if not batch then
+      if not singleDim and not batch then
          self.gradInput = self.gradInput:view(self.gradInput:size(2),
                                               self.gradInput:size(3),
                                               self.gradInput:size(4))
          self.output = self.output:view(self.output:size(2),
                                         self.output:size(3),
                                         self.output:size(4))
+      elseif singleDim and not batch then
+         self.gradInput = self.gradInput:view(self.gradInput:size(2))
+         self.output = self.output:view(self.output:size(2))
+      elseif singleDim and batch then
+         self.gradInput = self.gradInput:view(self.gradInput:size(1), self.gradInput:size(2))
+         self.output = self.output:view(self.output:size(1), self.output:size(2))
       end
    end
 end
@@ -54,8 +68,7 @@ function SpatialSoftMax:updateOutput(input)
 end
 
 function SpatialSoftMax:updateGradInput(input, gradOutput)
-   assert((gradOutput:dim() == 4 or gradOutput:dim() == 3)
-         and gradOutput:isContiguous());
+   assert(gradOutput:isContiguous());
    self:createIODescriptors(input)
    errcheck('cudnnSoftmaxBackward',
             cudnn.handle[cutorch.getDevice()-1],
-- 
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