cjolivier01 commented on a change in pull request #9958: Parallelization for 
ROIpooling OP
URL: https://github.com/apache/incubator-mxnet/pull/9958#discussion_r171917655
 
 

 ##########
 File path: src/operator/roi_pooling.cc
 ##########
 @@ -98,30 +109,26 @@ inline void ROIPoolForward(const Tensor<cpu, 4, Dtype> 
&out,
 
           const int pool_index = ph * pooled_width_ + pw;
           if (is_empty) {
-            top_data[pool_index] = 0;
-            argmax_data[pool_index] = -1;
+            top_data_c[pool_index] = 0;
+            argmax_data_c[pool_index] = -1;
           }
 
           for (int h = hstart; h < hend; ++h) {
             for (int w = wstart; w < wend; ++w) {
               const int index = h * width_ + w;
-              if (batch_data[index] > top_data[pool_index]) {
-                top_data[pool_index] = batch_data[index];
-                argmax_data[pool_index] = index;
+              if (batch_data_c[index] > top_data_c[pool_index]) {
+                top_data_c[pool_index] = batch_data_c[index];
+                argmax_data_c[pool_index] = index;
               }
             }
           }
         }
       }
-      // Increment all data pointers by one channel
-      batch_data += data.size(2) * data.size(3);
-      top_data += out.size(2) * out.size(3);
-      argmax_data += max_idx.size(2) * max_idx.size(3);
     }
-    // Increment ROI data pointer
-    bottom_rois += bbox.size(1);
+    // Increase data pointers by one outsize
+    top_data += channels_ * out_size_c;
 
 Review comment:
   Can these muls be taken out of the loop?

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