code: def __init__(self, num_head_outputs, num_agent_inputs, num_targets):
      self.input_schema = DummySchema(
          num_head_outputs, num_agent_inputs, 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 DummyLoss object  with example: obj = DummyLoss(num_head_outputs, num_agent_inputs, num_targets)