diff -ruN src\caffe2\operators\lengths_top_k_op.cc src-new\caffe2\operators\lengths_top_k_op.cc
--- src\caffe2\operators\lengths_top_k_op.cc	Fri Oct 20 14:02:11 2017
+++ src-new\caffe2\operators\lengths_top_k_op.cc	Fri Oct 20 13:56:20 2017
@@ -6,7 +6,7 @@
 bool LengthsTopKOp<T, Context>::RunOnDevice() {
   auto& X = Input(X_IN);
   auto& Y = Input(Y_IN);
-  auto N = Y.dim(0);
+  int N = Y.dim(0);
   const T* X_data = X.template data<T>();
   const int* input_len = Y.template data<int>();
   auto* output_topk_values = Output(TOPK_VALUES_OUT);