Traceback (most recent call last):


 "/usr/lib/python3.8/asyncio/base_events.py", line 1740, in call_exception_handler


 "/usr/lib/python3.8/logging/__init__.py", line 1463, in error


 "/usr/lib/python3.8/logging/__init__.py", line 1577, in _log


 "/usr/lib/python3.8/logging/__init__.py", line 1587, in handle


 "/usr/lib/python3.8/logging/__init__.py", line 1649, in callHandlers


 "/usr/lib/python3.8/logging/__init__.py", line 950, in handle


 "/usr/lib/python3.8/logging/__init__.py", line 1182, in emit


 "/usr/lib/python3.8/logging/__init__.py", line 1172, in _open
NameError: name 'open' is not defined

Overall Progress:
0%|
| 0/10000 [00:00<?, ?it/s]Traceback (most recent call last):


 "main.py", line 407, in <module>

validation_loss, _ = train(args=args, epoch=epoch - 1, start_iteration=global_iteration, data_loader=validation_loader, model=model_and_loss, optimizer=optimizer, logger=validation_logger, is_validate=True, offset=offset)
NameError: name 'validation_loader' is not defined
