fix?

ostap/core/ostap_types.py

@@ -26,7 +26,8 @@
     'sequence_types'  , ## sequence types
     'iterable_types'  , ## iterable 
     'sized_types'     , ## sized types
-    'path_types'      , ## path-like types     
+    'path_types'      , ## path-like types
+    'ordered_dict'    , ## normal/ordered dict 
     ##
     'is_integer'      , ## is a value of int-like type?
     'is_number'       , ## is a value of numeric  type?
@@ -76,11 +77,9 @@
 # =============================================================================
 logger.debug ( 'Core objects/classes/functions for Ostap')
 # =============================================================================
-
 iterable_types  = Iterable,
 num_types       = integer_types + ( float , ) 
 str_types       = str,
-
 list_types      = list , tuple
 import array 
 listlike_types  = list_types + ( set , C.Sequence , array.array )
@@ -99,7 +98,13 @@
 if (3,6) <= python_version :
     path_types = string_types + ( os.PathLike , )
 # =============================================================================
-
+## sometimewe we need to ensure that dictionary is ordered 
+ordered_dict = dict 
+if python_version < ( 3 , 7 ) :
+    from collections import OrderedDict as ordered_dict 
+    dictlike_types += ( ordered_dict, )
+    dict_types     += ( ordered_dict, )
+
 # =============================================================================
 ## Is this number of a proper integer?
 def is_integer ( v ) :

ostap/fitting/dataset.py

@@ -763,10 +763,6 @@ def _rds_make_unique_ ( dataset          ,
 ROOT.RooAbsData . sample        = _rad_sample_
 ROOT.RooAbsData . shuffle       = _rad_shuffle_
 
-from ostap.trees.trees import  _stat_covs_ 
-
-ROOT.RooAbsData . statCovs      = _stat_covs_ 
-
 from ostap.stats.statvars import data_the_moment
 ROOT.RooAbsData. the_moment = data_the_moment 
 
@@ -802,7 +798,6 @@ def _rds_make_unique_ ( dataset          ,
    ROOT.RooAbsData . sample        ,
    ROOT.RooAbsData . shuffle       ,
    #
-   ROOT.RooAbsData . statCovs      ,
    ]