RuntimeError: reciprocal is not implemented for type torch.cuda.LongTensor

运行Faster rcnn FPN网络，出现的bug：
RuntimeError: reciprocal is not implemented for type torch.cuda.LongTensor

 解决办法： anchor_target_layer_fpn.py", line 136:

            num_examples = torch.sum(labels[i] >= 0)
            num_examples = num_examples.float() 
            positive_weights = 1.0 / num_examples
            negative_weights = 1.0 / num_examples

ref：https://blog.csdn.net/qq_43088746/article/details/100422779