class_docstr: A stream that acts as a placeholder for data to be provided at later date.
      
class_docstr_tok: ["A","stream","that","acts","as","a","placeholder","for","data","to","be","provided","at","later","date","."]
code: def forward(self) -> "T":
      return self.value
  
imports: import inspect
  from abc import abstractmethod
  from typing import Generic, Iterable, TypeVar, Dict, Any, Callable, List, Tuple
  from tensortrade.core import Observable
  from tensortrade.feed.core.accessors import CachedAccessor
  from tensortrade.feed.core.mixins import DataTypeMixin
label_desc: Use image node_id 3 for calling the Placeholder obj's underlying member method code with example usage: obj.forward() and returns: self