replaced prints in costs
replaced print by logging in config
fixed module name
fixed module name for logger
replaced print by logging in dataset_get module
replaced print by logging in datasets
replaced logger strings name by python name keyword
replaced prints by logging in devtools
replaced prints by logging in expr
replaced prints by logging in gui
replaced prints by logging in linear
replaced prints by logging in models
reduced lines length for pep8
replaced prints by logging in optimization
replaced prints by logging in packaged_dependencies
replaced prints by logging in sandbox
replaced prints by logging in scripts
replaced prints by logging in train_extensions
replaced prints by logging in training_algorithms
replaced prints by logging in utils