class_docstr: ABC for classes that can load data for use with catalyst.pipeline APIs.
  
  TODO: DOCUMENT THIS MORE!
class_docstr_tok: ["ABC","for","classes","that","can","load","data","for","use","with","catalyst.pipeline","APIs",".","TODO",":","DOCUMENT","THIS","MORE","!"]
code: def columns(self):
      pass
  
imports: from abc import ABCMeta, abstractmethod
  from six import with_metaclass
label_desc: Use image node_id 2 for calling the PipelineLoader obj's underlying member method code with example usage: obj.columns() without return types