Fix zero division error in jaccard

tools/benchmark.lua

@@ -216,7 +216,12 @@ local function create_metric(metric)
 	       local num_a = ba:sum()
 	       local num_b = bb:sum()
 	       local a_and_b  = ba:cmul(bb):sum()
-	       return (a_and_b / (num_a + num_b - a_and_b))
+	       local abab = (num_a + num_b - a_and_b)
+	       if abab > 0 then
+		  return (a_and_b / abab)
+	       else
+		  return 1
+	       end
 	 end}
       else
 	 error("unknown metric: " .. metric)
@@ -615,10 +620,10 @@ local function load_data_from_dir(test_dir)
 	 table.insert(test_x, {y = iproc.crop_mod4(img),
 			       basename = base})
       end
-      if opt.show_progress then
-	 xlua.progress(i, #files)
-      end
       if i % 10 == 0 then
+	 if opt.show_progress then
+	    xlua.progress(i, #files)
+	 end
 	 collectgarbage()
       end
    end
@@ -636,10 +641,10 @@ local function load_data_from_file(test_file)
 	 table.insert(test_x, {y = iproc.crop_mod4(img),
 			       basename = base})
       end
-      if opt.show_progress then
-	 xlua.progress(i, #files)
-      end
       if i % 10 == 0 then
+	 if opt.show_progress then
+	    xlua.progress(i, #files)
+	 end
 	 collectgarbage()
       end
    end
@@ -694,10 +699,10 @@ local function load_user_data(y_dir, y_file, x_dir, x_file)
 			     x = x,
 			     basename = key})
       end
-      if opt.show_progress then
-	 xlua.progress(i, #y_files)
-      end
       if i % 10 == 0 then
+	 if opt.show_progress then
+	    xlua.progress(i, #y_files)
+	 end
 	 collectgarbage()
       end
    end