exceptions instead of asserts

Author: martham93

label_maker/package.py

@@ -35,7 +35,7 @@ def package_directory(dest_folder, classes, imagery, ml_type, seed=False, split_
         Percentage of data to put in each catagory listed in split_names.
         Must be floats and must sum to one.
     split_names: list
-        Default: ['train', 'test'] 
+        Default: ['train', 'test']
         List of names for each subset of the data.
     **kwargs: dict
         Other properties from CLI config passed as keywords to other utility functions
@@ -44,9 +44,10 @@ def package_directory(dest_folder, classes, imagery, ml_type, seed=False, split_
     if seed:
         np.random.seed(seed)
 
-    #assert len(split_names) == 2 or len(split_names) == 3.
-    assert len(split_names) == len(split_vals), "split_names and split_vals must be the same length."
-    assert np.isclose(sum(split_vals), 1), "split_vals must sum to one."
+    if len(split_names) != len(split_vals):
+        raise ValueError('`split_names` and `split_vals` must be the same length. Please update your config.')
+    if not np.isclose(sum(split_vals), 1):
+        raise ValueError('`split_vals` must sum to one. Please update your config.')
 
     # open labels file, create tile array
     labels_file = op.join(dest_folder, 'labels.npz')