Issue: multiprocessing in dataset map "can only test a child process"

Comment:
hi facing the same issue here - 

`AssertionError: Caught AssertionError in DataLoader worker process 0.
Original Traceback (most recent call last):
  File "/usr/lib/python3.6/logging/__init__.py", line 996, in emit
    stream.write(msg)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/lib/redirect.py", line 100, in new_write
    cb(name, data)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/wandb_run.py", line 723, in _console_callback
    self._backend.interface.publish_output(name, data)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 153, in publish_output
    self._publish_output(o)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 158, in _publish_output
    self._publish(rec)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 456, in _publish
    if self._process and not self._process.is_alive():
  File "/usr/lib/python3.6/multiprocessing/process.py", line 134, in is_alive
    assert self._parent_pid == os.getpid(), 'can only test a child process'
AssertionError: can only test a child process

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/worker.py", line 198, in _worker_loop
    data = fetcher.fetch(index)
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "<ipython-input-8-a4d9a08d114e>", line 20, in __getitem__
    return_token_type_ids=True
  File "/usr/local/lib/python3.6/dist-packages/transformers/tokenization_utils_base.py", line 2405, in encode_plus
    **kwargs,
  File "/usr/local/lib/python3.6/dist-packages/transformers/tokenization_utils_base.py", line 2125, in _get_padding_truncation_strategies
    "Truncation was not explicitly activated but `max_length` is provided a specific value, "
  File "/usr/lib/python3.6/logging/__init__.py", line 1320, in warning
    self._log(WARNING, msg, args, **kwargs)
  File "/usr/lib/python3.6/logging/__init__.py", line 1444, in _log
    self.handle(record)
  File "/usr/lib/python3.6/logging/__init__.py", line 1454, in handle
    self.callHandlers(record)
  File "/usr/lib/python3.6/logging/__init__.py", line 1516, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python3.6/logging/__init__.py", line 865, in handle
    self.emit(record)
  File "/usr/lib/python3.6/logging/__init__.py", line 1000, in emit
    self.handleError(record)
  File "/usr/lib/python3.6/logging/__init__.py", line 917, in handleError
    sys.stderr.write('--- Logging error ---\n')
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/lib/redirect.py", line 100, in new_write
    cb(name, data)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/wandb_run.py", line 723, in _console_callback
    self._backend.interface.publish_output(name, data)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 153, in publish_output
    self._publish_output(o)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 158, in _publish_output
    self._publish(rec)
  File "/usr/local/lib/python3.6/dist-packages/wandb/sdk/interface/interface.py", line 456, in _publish
    if self._process and not self._process.is_alive():
  File "/usr/lib/python3.6/multiprocessing/process.py", line 134, in is_alive
    assert self._parent_pid == os.getpid(), 'can only test a child process'
AssertionError: can only test a child process`