code: def test_encoder_on_cpu(self):
      self.run_test_encoder_on_device("cpu")
  
imports: import unittest
  import numpy
  import random
  import torch
  from torch.nn.functional import softmax
  from sklearn.metrics import accuracy_score
  from lightwood.encoder import BinaryEncoder, NumericEncoder
  from lightwood.encoder.text import PretrainedLangEncoder
  from type_infer.dtype import dtype
  import pandas
  import os
  import pathlib
label_desc: Use image node_id 5 for calling the TestPretrainedLangEncoder obj's underlying member method code with example usage: obj.test_encoder_on_cpu() without return types