class_docstr: An InputSource which proxy every method to ``self._input``.
class_docstr_tok: ["An","InputSource","which","proxy","every","method","to","``","self._input","``","."]
code: def __init__(self, input):
      assert isinstance(input, InputSource), input
      self._input = input
  
imports: import copy
  from abc import ABCMeta, abstractmethod
  from contextlib import contextmanager
  import six
  import tensorflow
  from ..callbacks.base import CallbackFactory
  from ..tfutils.common import get_op_tensor_name
  from ..utils import logger
  from ..utils.argtools import call_only_once, memoized_method
  from ..compat import tfv1
label_desc: Use image node_id 1 to create a new ProxyInputSource object from inherited base classes: InputSource with example: obj = ProxyInputSource(input)