Fixed multi-GPU training for Tensor Cores

AlexeyAB

2018-03-09 880cf187d87c904f5fe574802ecff99118643f2d

 src/detector.c

@@ -918,7 +918,7 @@
      float box_h = points->data.fl[i * 2 + 1];
      //int cluster_idx = labels->data.i[i];    
      int cluster_idx = 0;
      float min_dist = 1000000;
      float min_dist = FLT_MAX;
      for (j = 0; j < num_of_clusters; ++j) {
         float anchor_w = centers->data.fl[j * 2];
         float anchor_h = centers->data.fl[j * 2 + 1];