From d9f1b0b16edeb59281355a855e18a8be343fc33c Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Fri, 08 Aug 2014 19:04:15 +0000
Subject: [PATCH] probably how maxpool layers should be

---
 src/col2im.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/col2im.c b/src/col2im.c
index bc15b7b..fd7de4f 100644
--- a/src/col2im.c
+++ b/src/col2im.c
@@ -1,4 +1,6 @@
-inline void col2im_set_pixel(float *im, int height, int width, int channels,
+#include <stdio.h>
+#include <math.h>
+inline void col2im_add_pixel(float *im, int height, int width, int channels,
                         int row, int col, int channel, int pad, float val)
 {
     row -= pad;
@@ -6,7 +8,7 @@
 
     if (row < 0 || col < 0 ||
         row >= height || col >= width) return;
-    im[col + width*(row + channel*height)] = val;
+    im[col + width*(row + channel*height)] += val;
 }
 //This one might be too, can't remember.
 void col2im_cpu(float* data_col,
@@ -31,7 +33,7 @@
                 int im_row = h_offset + h * stride;
                 int im_col = w_offset + w * stride;
                 double val = data_col[(c * height_col + h) * width_col + w];
-                col2im_set_pixel(data_im, height, width, channels,
+                col2im_add_pixel(data_im, height, width, channels,
                         im_row, im_col, c_im, pad, val);
             }
         }

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