code: def __init__(self, num_head_outputs, num_agent_inputs, num_targets):
      self.head_outputs = [
          "head_output_{}".format(i) for i in range(num_head_outputs)
      ]
      self.agent_inputs = [
          "agent_input_{}".format(i) for i in range(num_agent_inputs)
      ]
      self.targets = ["target_{}".format(i) for i in range(num_targets)]
  
imports: import pytest
  import mxnet
  from mxnet import nd
  import numpy
  from rl_coach.architectures.mxnet_components.utils import *
label_desc: Use image node_id 1 to create a new DummySchema object  with example: obj = DummySchema(num_head_outputs, num_agent_inputs, num_targets)