code: def get_const_batch_metric(value):
      def const_batch_metric(y_pred, y_true):
          return value
  
      return const_batch_metric
  
imports: import os
  import unittest
  from unittest import skipIf
  from unittest.mock import ANY
  import numpy
  import torch
  import torch.nn
  import torchmetrics
  from poutyne import Metric, Model, do_register_metric_class, rename_doubles, unregister_metric_class
label_desc: Use image node_id 2 for calling a global function with example usage: get_const_batch_metric(value) and returns: const_batch_metric, value