code: def run_migrations_online():
      """Run migrations in 'online' mode.
  
      In this scenario we need to create an Engine
      and associate a connection with the context.
  
      """
      connectable = engine_from_config(
          config.get_section(config.config_ini_section),
          prefix="sqlalchemy.",
          poolclass=pool.NullPool,
      )
  
      with connectable.connect() as connection:
          context.configure(
              connection=connection,
              target_metadata=target_metadata,
              render_as_batch=True,
          )
  
          with context.begin_transaction():
              context.run_migrations()
  
file_path: optuna/optuna/storages/_rdb/alembic/env.py
imports: import logging
  from logging.config import fileConfig
  from alembic import context
  from sqlalchemy import engine_from_config
  from sqlalchemy import pool
  import optuna.storages._rdb.models
label_desc: Use image node_id 2 for calling a global function with example usage: run_migrations_online() without return types