Tensorboard is not displaying any data

I have this code on my jupyter notebook to show data on tensorboard.

%pylab inline
import torch

%load_ext tensorboard

import torch.utils.tensorboard as tb
import tempfile
log_dir = tempfile.mkdtemp()
%tensorboard --logdir {log_dir} --reload_interval 1

logger = tb.SummaryWriter(log_dir+'/test3', flush_secs=1)
logger.add_scalar('first/some_number', 0, global_step=1)
logger.add_scalar('first/some_number', 1, global_step=2)

However, I did not see anything on my tensorboard.

can someone please tell me what I did wrong?

Edit: Somehow I am able to show the data on my tensorboard. But whenever I create a new tensorboard the log_dir is always using the old one.

new log_dir

old log_dir

How do I update my log_dir such that I can use my new log_dir to show up?