code: def network_factory(
      environment_spec: specs.EnvironmentSpec,
      agent_types: Dict[ma_types.AgentID, ma_types.GenericAgent],
      init_network_fn: Optional[ma_types.InitNetworkFn] = None,
  ) -> ma_types.MultiAgentNetworks:
      """Returns networks for all agents.
  
      Args:
        environment_spec: environment spec.
        agent_types: dict mapping agent IDs to their type.
        init_network_fn: optional callable that handles the network initialization
          for all sub-agents. If this is not supplied, a default network initializer
          is used (if it is supported for the designated agent type).
      """
      init_fn = init_network_fn or init_default_network
      networks = {}
      for agent_id, agent_type in agent_types.items():
          single_agent_spec = ma_utils.get_agent_spec(
              environment_spec, agent_id
          )
          networks[agent_id] = init_fn(agent_type, single_agent_spec)
      return networks
  
file_path: acme/acme/agents/jax/multiagent/decentralized/factories.py
imports: import enum
  from typing import Any, Dict, Optional
  from acme import specs
  from acme.adders import reverb
  from acme.agents.jax import builders
  from acme.agents.jax import ppo
  from acme.agents.jax import sac
  from acme.agents.jax import td3
  from acme.multiagent import types
  from acme.multiagent import utils
label_desc: Use image node_id 6 for calling a global function with example usage: network_factory(environment_spec, agent_types, init_network_fn) and returns: networks