Inspect UserWarning: TrainsLogger output_handler can not log metrics value type <class 'torch.Tensor'>

## 🚀 Feature

Currently, when running pascal voc12 training with Trains, we have the following warnings:

```
/ignite/ignite/contrib/handlers/trains_logger.py:150: UserWarning: TrainsLogger output_handler can not log metrics value type <class 'torch.Tensor'>
  warnings.warn("TrainsLogger output_handler can not log " "metrics value type {}".format(type(value)))
```