class_docstr: Task for value training.
code: def _sync_target_model(self):
      self._target_model.weights = self._train_model.weights
      self._target_model.state = self._train_model.state
      self._synced = True
  
file_path: trax/trax/rl/value_tasks.py
imports: import copy
  import numpy
  from trax import layers
  from trax.fastmath import numpy
  from trax.supervised import training
label_desc: Use image node_id 3 for calling the ValueTrainTask obj's underlying member method code with example usage: obj._sync_target_model() without return types