class_docstr: Describes offset within shared memory chunk and size of serialized list of
  `SampleMeta` instances
code: def __init__(self, meta_offset, meta_size):
      self.meta_offset = meta_offset
      self.meta_size = meta_size
  
imports: import os
  from nvidia.dali._multiproc import shared_mem
  from nvidia.dali._multiproc.messages import ShmMessageDesc
  from nvidia.dali._utils.external_source_impl import assert_cpu_sample_data_type, sample_to_numpy
  import pickle
label_desc: Use image node_id 1 to create a new SharedBatchMeta object  with example: obj = SharedBatchMeta(meta_offset, meta_size)