class_docstr: Test the Regnet FSDP model in comparison with the DDP Regnet
  to verify that both converge to the same losses
code: def _get_number_parameters(model):
      return sum(p.numel() for p in model.parameters())
  
file_path: vissl/tests/test_resnext.py
imports: import unittest
  from vissl.models import build_model
  from vissl.optimizers import *
  from vissl.utils.hydra_config import compose_hydra_configuration, convert_to_attrdict
label_desc: Use image node_id 2 for calling the TestResNeXt obj's underlying member method code with example usage: obj._get_number_parameters(model) and returns: sum