docstr: Current mini-batch target.
code: def mb_y(self):
      """Current mini-batch target."""
      mbatch = self.mbatch
      assert mbatch is not None
      return mbatch[1]
  
file_path: avalanche/avalanche/training/templates/problem_type/supervised_problem.py
imports: from avalanche.models import avalanche_forward
  from avalanche.training.templates.strategy_mixin_protocol import SupervisedStrategyProtocol
label_desc: Use image node_id 2 for calling the SupervisedProblem obj's underlying member method code with example usage: obj.mb_y() and returns: mbatch