added missing .data api export

batchglm/api/data.py

@@ -1,3 +1,4 @@
 from batchglm.data import design_matrix
-from batchglm.data import constraint_matrix_from_dict, constraint_matrix_from_string, string_constraints_from_dict
+from batchglm.data import constraint_matrix_from_dict, constraint_matrix_from_string, string_constraints_from_dict, \
+    constraint_system_from_star
 from batchglm.data import view_coef_names, preview_coef_names

batchglm/data.py

@@ -1,11 +1,8 @@
-import dask
-import dask.array
 import logging
 import patsy
 import pandas as pd
 import numpy as np
-import scipy.sparse
-from typing import Union, Dict, Tuple, List
+from typing import Union, Tuple, List
 
 try:
     import anndata