Provide the root module of a TF-2.0 API for use within TensorBoard.

  Returns:
    The root module of a TF-2.0 API, if available.

  Raises:
    ImportError: if a TF-2.0 API is not available.

def tf2():
  """Provide the root module of a TF-2.0 API for use within TensorBoard.

  Returns:
    The root module of a TF-2.0 API, if available.

  Raises:
    ImportError: if a TF-2.0 API is not available.
  """
  # Import the `tf` compat API from this file and check if it's already TF 2.0.
  if tf.__version__.startswith('2.'):
    return tf
  elif hasattr(tf, 'compat') and hasattr(tf.compat, 'v2'):
    # As a fallback, try `tensorflow.compat.v2` if it's defined.
    return tf.compat.v2
  raise ImportError('cannot import tensorflow 2.0 API')