code: def _make_head_network(num_outputs: int) -> snt.Module:
      """Create head network (outputs Q-values)."""
      return snt.nets.MLP([num_outputs])
  
file_path: acme/acme/agents/tf/iqn/learning_test.py
imports: import copy
  from acme import specs
  from acme.agents.tf import iqn
  from acme.testing import fakes
  from acme.tf import networks
  from acme.tf import utils
  from acme.utils import counting
  import numpy
  import sonnet
  from absl.testing import absltest
label_desc: Use image node_id 2 for calling a global function with example usage: _make_head_network(num_outputs) and returns: snt