bugfix with path property

src/taggingbackends/data/dataset.py

@@ -10,6 +10,7 @@ Torch-like dataset class for *larva_dataset hdf5* files.
 class LarvaDataset:
     def __init__(self, dataset=None, generator=None, subsets=(.8, .1, .1),
                  balancing_strategy=None, class_weights=None):
+        self._path = None
         self.generator = generator
         self._full_set = dataset
         self.subset_shares = subsets
@@ -26,7 +27,6 @@ class LarvaDataset:
             self.weight_classes = isinstance(balancing_strategy, str) and (balancing_strategy.lower() == 'auto')
         else:
             self.class_weights = class_weights
-        self._path = None
 
     """
     *h5py.File*: *larva_dataset hdf5* file handler.