Merge branch 'unified_dataset'

.gitignore

convlab2/dialog_agent/agent.py

convlab2/evaluator/multiwoz_eval.py

convlab2/policy/evaluate.py

convlab2/policy/mle/loader.py

convlab2/policy/mle/multiwoz/loader.py

convlab2/policy/mle/multiwoz/mle.py

convlab2/policy/ppo/semantic_level_config.json

convlab2/policy/rule/multiwoz/policy_agenda_multiwoz.py

convlab2/policy/vector/vector_base.py

convlab2/util/dataloader/dataset_dataloader.py

convlab2/util/multiwoz/lexicalize.py

data/multiwoz/remap_actions.py

data/unified_datasets/README.md

data/unified_datasets/check.py

data/unified_datasets/multiwoz21/booking_remapper.py

data/unified_datasets/multiwoz21/data.zip

data/unified_datasets/multiwoz21/dummy_data.json

data/unified_datasets/multiwoz21/preprocess.py

data/unified_datasets/sgd/data.zip