title: official module in tensorflow examples at tensorflow.org
body: <p>I've been following a tensorflow tutorial <a href="https://www.tensorflow.org/official_models/fine_tuning_bert" rel="nofollow noreferrer">https://www.tensorflow.org/official_models/fine_tuning_bert</a></p>
  <p>In the first code snippet, I saw a lot of imports from official module</p>
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  
  import tensorflow as tf
  
  import tensorflow_hub as hub
  import tensorflow_datasets as tfds
  tfds.disable_progress_bar()
  
  from official.modeling import tf_utils
  from official import nlp
  from official.nlp import bert
  
  # Load the required submodules
  import official.nlp.optimization
  import official.nlp.bert.bert_models
  import official.nlp.bert.configs
  import official.nlp.bert.run_classifier
  import official.nlp.bert.tokenization
  import official.nlp.data.classifier_data_lib
  import official.nlp.modeling.losses
  import official.nlp.modeling.models
  import official.nlp.modeling.networks
  </code></pre>
  <p>And problem is that i found no module name official.
  I guess this official module somehow related to problem specific or for BERT model(from tf-hub).
  As bert model uses specific text preprocessing and official module is providing this.</p>
  <p>So, where i can find, download, use and make imports from this official module to work? I've been using python 3.7, tf-2.2, tf-hub-0.8.0</p>
  <p>Please help me out</p>