code: def test_init(self):
      lm = ecco.from_pretrained("sshleifer/tiny-gpt2", activations=True)
  
      assert isinstance(
          lm.model, PreTrainedModel
      ), "Model downloaded and LM was initialized successfully."
  
file_path: ecco/tests/lm_test.py
imports: from ecco.lm import LM, _one_hot, sample_output_token, activations_dict_to_array
  import ecco
  import torch
  import numpy
  from transformers import PreTrainedModel
label_desc: Use image node_id 5 for calling the TestLM obj's underlying member method code with example usage: obj.test_init() without return types