code: def test_simple_activations_ch():
      run_test(4096, (2048,), True)
  
imports: from ctypes import pointer
  from tempfile import NamedTemporaryFile
  from collections import defaultdict
  from assertpy.assertpy import assert_that
  from multiprocessing import cpu_count
  import torch
  from assertpy import assert_that
  import numpy
  from torch.utils.data import Dataset
  from ffcv import DatasetWriter
  from ffcv.fields import IntField, NDArrayField, TorchTensorField
  from ffcv import Loader
label_desc: Use image node_id 3 for calling a global function with example usage: test_simple_activations_ch() without return types