Writes batch images of specified DatasetType to Tensorboard.

def _write_for_dstype(self, learn:Learner, batch:Tuple, iteration:int, tbwriter:SummaryWriter, ds_type:DatasetType)->None:
        "Writes batch images of specified DatasetType to Tensorboard."
        request = ImageTBRequest(learn=learn, batch=batch, iteration=iteration, tbwriter=tbwriter, ds_type=ds_type)
        asyncTBWriter.request_write(request)