non itorch fixes

Author: soumith

3_unsupervised/1_data.lua

@@ -196,6 +196,9 @@ function displayData(dataset, nsamples, nrow, zoom)
       ex[cntr] = exx[1]:clone():unfold(1,math.sqrt(exx[1]:size(1)),math.sqrt(exx[1]:size(1)))
       cntr = cntr + 1
    end
-
-   itorch.image(ex)
+   if itorch then
+      itorch.image(ex)
+   else
+      print('For visualization, run the script in itorch')
+   end
 end

4_graphicalmodels/2_crf.lua

@@ -46,13 +46,15 @@ do
    X = X + randn(X:size())/2
 
    -- display a couple of input examples
-   print('training examples visualization:')
-   itorch.image({
-      X[1]:reshape(32,32),
-      X[2]:reshape(32,32),
-      X[3]:reshape(32,32),
-      X[4]:reshape(32,32)
-   })
+   if itorch then
+      print('training examples visualization:')
+      itorch.image({
+	    X[1]:reshape(32,32),
+	    X[2]:reshape(32,32),
+	    X[3]:reshape(32,32),
+	    X[4]:reshape(32,32)
+      })
+   end
 
    -- define adjacency matrix (4-connexity lattice)
    local adj = gm.adjacency.lattice2d(nRows,nCols,4)
@@ -144,11 +146,15 @@ do
    end
 
    -- display
-   print('marginals:')
-   itorch.image(marginals)
+   if itorch then
+      print('marginals:')
+      itorch.image(marginals)
+   end
    for _,labeling in ipairs(labelings) do
       labeling:add(-1)
    end
-   print('labelings:')
-   itorch.image(labelings)
+   if itorch then
+      print('labelings:')
+      itorch.image(labelings)
+   end
 end