class_docstr: Mainly used for maintaining all ParamAttr in a parl.layers.LayerFunc
      
class_docstr_tok: ["Mainly","used","for","maintaining","all","ParamAttr","in","a","parl.layers.LayerFunc"]
code: def _add_attr(self, name, attr):
      assert name not in self._attrs_dict
      self._attrs_dict[name] = attr
  
file_path: PARL/parl/core/fluid/layers/attr_holder.py
imports: import six
  from copy import deepcopy
label_desc: Use image node_id 2 for calling the AttrHolder obj's underlying member method code with example usage: obj._add_attr(name, attr) without return types