Update train_meta_model_combine.py

[venkatesh-thiru]

Running the train_meta_model_combine.py

Example

python train_meta_model_combine.py --base_model='WideResNet_BaseModel' --meta_model='WideResNet_MetaModel_combine' --name='CIFAR100_OOD' --dataset='CIFAR100' --lr=1e-2 --seed_trail=0 --decay=1e-4 --epoch=1 --lambda_KL=1e-3

would result in

Traceback (most recent call last):
  File "/meta_dirichlet/PosthocUQ/train_meta_model_combine.py", line 477, in <module>
    if not args.early_stop:
AttributeError: 'Namespace' object has no attribute 'early_stop'

As the early_stop argument is not declared during the argparse.

This change will remove lines 477 and 478 from train_meta_model_combine.py file, that has unused function calls.