def start(logdir):
    """Start a TensorBoard instance.

    Args:
      logdir: the logdir to run TensorBoard on.
    Raises:
      Exception if the instance cannot be started.
    """
    if logdir.startswith('gs://'):
      # Check user does have access. TensorBoard will start successfully regardless
      # the user has read permissions or not so we check permissions here to
      # give user alerts if needed.
      datalab.storage._api.Api.verify_permitted_to_read(logdir)

    port = datalab.utils.pick_unused_port()
    args = ['tensorboard', '--logdir=' + logdir, '--port=' + str(port)]
    p = subprocess.Popen(args)
    retry = 10
    while (retry > 0):
      if datalab.utils.is_http_running_on(port):
        basepath = os.environ.get('DATALAB_ENDPOINT_URL', '')
        url = '%s/_proxy/%d/' % (basepath.rstrip('/'), port)
        html = '<p>TensorBoard was started successfully with pid %d. ' % p.pid
        html += 'Click <a href="%s" target="_blank">here</a> to access it.</p>' % url
        IPython.display.display_html(html, raw=True)
        return p.pid
      time.sleep(1)
      retry -= 1

    raise Exception('Cannot start TensorBoard.')
def start ( logdir ) : if logdir . startswith ( 'gs://' ) : datalab . storage . _api . Api . verify_permitted_to_read ( logdir ) port = datalab . utils . pick_unused_port ( ) args = [ 'tensorboard' , '--logdir=' + logdir , '--port=' + str ( port ) ] p = subprocess . Popen ( args ) retry = 10 while ( retry > 0 ) : if datalab . utils . is_http_running_on ( port ) : basepath = os . environ . get ( 'DATALAB_ENDPOINT_URL' , '' ) url = '%s/_proxy/%d/' % ( basepath . rstrip ( '/' ) , port ) html = '<p>TensorBoard was started successfully with pid %d. ' % p . pid html += 'Click <a href="%s" target="_blank">here</a> to access it.</p>' % url IPython . display . display_html ( html , raw = True ) return p . pid time . sleep ( 1 ) retry -= 1 raise Exception ( 'Cannot start TensorBoard.' )
Start a TensorBoard instance.

    Args:
      logdir: the logdir to run TensorBoard on.
    Raises:
      Exception if the instance cannot be started.