AdvancedProfiler error
Hi, as others have pointed out, the Profiler doesn't seem to work (it prints nothing), and trying out the AdvancedProfiler as in https://pytorch-lightning.readthedocs.io/en/latest/profiler.html like:
from pytorch_lightning.profiler import AdvancedProfiler
    profiler = AdvancedProfiler(output_filename="prof.txt")
    trainer = Trainer(profiler=profiler, (other params here)

gives me the following error:
Validation sanity check: 50it [00:00, 212.11it/s]             Traceback (most recent call last):
  File "/Users/sdumitre/work/style/training.py", line 177, in <module>
    main(hparams)
  File "/Users/sdumitre/work/style/training.py", line 77, in main
    trainer.fit(model)
  File "/Users/sdumitre/virtual/p3/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 630, in fit
    self.run_pretrain_routine(model)
  File "/Users/sdumitre/virtual/p3/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 810, in run_pretrain_routine
    _, _, _, callback_metrics, _ = self.process_output(eval_results)
  File "/Users/sdumitre/virtual/p3/lib/python3.7/site-packages/pytorch_lightning/trainer/logging.py", line 117, in process_output
    callback_metrics[k] = v.item()
ValueError: only one element tensors can be converted to Python scalars
                                                 
Process finished with exit code 1

Any pointers?
My env: torch 1.4 installed with pip, Python 3.7, no GPU, on, MacOS.
Thanks for the great lib you're developing!