code: def test_constructor(self):
      assert isinstance(self.bert_model, BertModel)
  
      assert self.bert_model.max_sequence_length == 4
  
      num_weights = sum(
          [p.numel() for p in self.bert_model.parameters()]
      )
      assert num_weights == 6702
  
file_path: megatron-lm/tests/unit_tests/models/test_bert_model.py
imports: import pytest
  import torch
  from megatron.core.transformer.transformer_config import TransformerConfig
  from megatron.core.models.bert.bert_model import BertModel
  from tests.unit_tests.test_utilities import Utils
  from megatron.core.tensor_parallel.random import model_parallel_cuda_manual_seed
  from megatron.core.models.bert.bert_layer_specs import bert_layer_with_transformer_engine_spec
label_desc: Use image node_id 3 for calling the TestBertModel obj's underlying member method code with example usage: obj.test_constructor() without return types