summary_writer_demo.py

import datetime
from pathlib import Path

from torch.utils.tensorboard import SummaryWriter


dt = datetime.datetime.now().isoformat(sep='_', timespec='milliseconds').replace(':', '-')
tb_dir = Path('tb') / dt

with SummaryWriter(str(tb_dir)) as writer:
    writer.add_scalar('train/loss', 9001.0, 0)
    writer.add_text('some/category', 'Hello world!', 1337)