code: def _get_sliced_variables(var_list):
    
    unsliced_variables = []
    sliced_variables = collections.defaultdict(lambda: [])
    for var in var_list:
      if var._save_slice_info:
        sliced_variables[var._save_slice_info.full_name].append(var)
      else:
        unsliced_variables.append(var)
    return unsliced_variables, sliced_variables
docs: Separates the sliced (partitioned) and unsliced variables in var_list.
  
    Args:
      var_list: a list of variables.
  
    Returns:
      A list of unsliced variables in var_list, and a dict mapping names to parts
      for the sliced variables in var_list.