Variable 'tensor_names' referenced before assignment

[Sid Mani]

pytorch_memlab/pytorch_memlab/mem_reporter.py

Line 37 in ec9a72f

 for param, name in tensor_names.items(): 

The variable tensor_names is referenced before assignment if no model is passed into the MemReporter. Need to move it into the above if statement.

[Kaiyu Shi]

Thanks for reporting this issue, will do this week.