Conda error while Train Detection Model

[stefanhahmann]

We tested Elephant with our own data. When trying to train a detection model the following error message occured on the server:

Task apis.seg.train_seg_task[c45c4188-a82e-4f5a-a87e-176c60acedb9] raised unexpected: ValueError('empty range for randrange() (144,98, -46)')
Traceback (most recent call last):
  File "/opt/conda/lib/python3.7/site-packages/celery/app/trace.py", line 405, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/app/main.py", line 48, in __call__
    return self.run(*args, **kwargs)
  File "/app/apis/seg.py", line 101, in train_seg_task
    memmap_dir, input_size)
  File "/opt/conda/lib/python3.7/site-packages/elephant/common.py", line 165, in run_train_seg
    is_cpu=is_cpu, is_mixed_precision=is_mixed_precision)
  File "/opt/conda/lib/python3.7/site-packages/elephant/common.py", line 329, in run_train
    for batch_id, ((x, keep_axials), y) in enumerate(loader):
  File "/opt/conda/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 521, in __next__
    data = self._next_data()
  File "/opt/conda/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 561, in _next_data
    data = self._dataset_fetcher.fetch(index)  # may raise StopIteration
  File "/opt/conda/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 49, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/opt/conda/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 49, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/opt/conda/lib/python3.7/site-packages/elephant/datasets.py", line 621, in __getitem__
    return super()._generate_item(img_input, img_label, self.crop_size)
  File "/opt/conda/lib/python3.7/site-packages/elephant/datasets.py", line 310, in _generate_item
    for i in range(self.n_dims)
  File "/opt/conda/lib/python3.7/site-packages/elephant/datasets.py", line 310, in <listcomp>
    for i in range(self.n_dims)
  File "/opt/conda/lib/python3.7/random.py", line 222, in randint
    return self.randrange(a, b+1)
  File "/opt/conda/lib/python3.7/random.py", line 200, in randrange
    raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (144,98, -46)