code: def on_step_validation(self, state):
      super(AggregatePredictions, self).on_step_validation(state)
      self.predictions_list.append(state[torchbearer.Y_PRED])
  
file_path: torchbearer/torchbearer/callbacks/aggregate_predictions.py
imports: import torchbearer
  from torchbearer.callbacks import Callback
  import torch
  import warnings
label_desc: Use image node_id 2 for calling the AggregatePredictions obj's underlying member method code with example usage: obj.on_step_validation(state) without return types