title: custom object detection with yolov5
body: <p>I Have been trying to custom train YOLOv5 model with one label and I have made suitable changes in YAML file .However,
  mAP( mean accuracy precision) value is still 0 no matter how many epochs I run the training for. I have been struggling with this issue for many days.
  Can someone suggest a solution?</p>
  <pre><code> Epoch   gpu_mem       box       obj       cls    labels  img_size
     1/2    0.614G   0.07749   0.03705         0         7       640: 100% 15/15 [00:01&lt;00:00, 10.99it/s]
             Class     Images     Labels          P          R     mAP@.5 mAP@.5:.95: 100% 3/3 [00:00&lt;00:00, 26.59it/s]
               all         12         14          0          0          0          0
  
   Epoch   gpu_mem       box       obj       cls    labels  img_size
     2/2    0.614G   0.07758   0.03295         0         5       640: 100% 15/15 [00:01&lt;00:00, 10.98it/s]
             Class     Images     Labels          P          R     mAP@.5 mAP@.5:.95: 100% 3/3 [00:00&lt;00:00, 28.13it/s]
               all         12         14          0          0          0          0
  </code></pre>