torch/utils/tensorboard/__init__.py

import tensorboard
from distutils.version import LooseVersion

if not hasattr(tensorboard, "__version__") or LooseVersion(
    tensorboard.__version__
) < LooseVersion("1.15"):
    raise ImportError("TensorBoard logging requires TensorBoard version 1.15 or above")

del LooseVersion
del tensorboard

from .writer import FileWriter, SummaryWriter  # noqa: F401
from tensorboard.summary.writer.record_writer import RecordWriter  # noqa: F401