model does not train or write into the tmp path

```
Task Training model for Patchwise Analysis of Music Document, Training[eacd36d5-c8dd-4b02-b9cd-38ca31c92959] raised unexpected: RuntimeError("The job did not produce the output file for Background Model.\n\n{'Log File': [{'resource_type': 'text/plain', 'uuid': UUID('c031c7c9-c86d-481f-ae62-59f0b2491828'), 'is_list': False, 'resource_temp_path': '/tmp/tmpa8eq61gp/0fd193e7-8b3d-45a0-84d8-b99c0b2b8fc0'}], 'Background Model': [{'resource_type': 'keras/model+hdf5', 'uuid': UUID('c7a3b8ca-429a-4fcd-be92-2957e00497ba'), 'is_list': False, 'resource_temp_path': '/tmp/tmpa8eq61gp/faebcd1f-c384-44b9-9572-25f5ac27b12e'}], 'Model 1': [{'resource_type': 'keras/model+hdf5', 'uuid': UUID('eea42920-5100-4a57-9604-7688d582b482'), 'is_list': False, 'resource_temp_path': '/tmp/tmpa8eq61gp/a69ba529-0053-4c7f-bc3d-333942300b15'}], 'Model 2': [{'resource_type': 'keras/model+hdf5', 'uuid': UUID('3fd388db-1cf3-4400-9fb7-712bd3f6738e'), 'is_list': False, 'resource_temp_path': '/tmp/tmpa8eq61gp/03ac3bb9-3323-42a0-b989-5eadae3a0529'}]}")
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/celery/app/trace.py", line 412, in trace_task
R = retval = fun(*args, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/celery/app/trace.py", line 704, in __protected_call__
return self.run(*args, **kwargs)
File "/code/Rodan/rodan/jobs/base.py", line 843, in run
).format(opt_name, outputs)
RuntimeError: The job did not produce the output file for Background Model.
```
The error above was produced in Rodan on prod and local. Upon testing it looks like it is a problem with Paco trainer and likely associated with small RAM.