code: def batch_fn(self, list_of_samples):
      x = super().batch_fn(list_of_samples)
      x.update(c="banana")
      return x
  
imports: from unittest import TestCase
  import jax.numpy
  import numpy
  import optax
  import pytest
  import elegy
label_desc: Use image node_id 3 for calling the DS_custom_batch_fn obj's underlying member method code with example usage: obj.batch_fn(list_of_samples) and returns: x