code: def forward(
      self, x, incremental_state: Optional[Dict[str, Tensor]] = None
  ):
      return x
  
imports: from typing import Dict, Optional, Tuple
  from pytext.config.module_config import ModuleConfig
  from pytext.models.module import Module
  from pytext.utils.usage import log_class_usage
  from torch import nn, Tensor
  from .utils import prepare_full_key
label_desc: Use image node_id 1 for calling the PlaceholderIdentity obj's underlying member method code with example usage: obj.forward(x, incremental_state) and returns: x