class_docstr: This class applies the `FeedForward` to each item in sequences.
  
  Registered as a `Seq2SeqEncoder` with name "feedforward".
code: def get_output_dim(self) -> int:
      return self._feedforward.get_output_dim()
  
file_path: allennlp/allennlp/modules/seq2seq_encoders/feedforward_encoder.py
imports: import torch
  from allennlp.modules.feedforward import FeedForward
  from allennlp.modules.seq2seq_encoders.seq2seq_encoder import Seq2SeqEncoder
label_desc: Use image node_id 3 for calling the FeedForwardEncoder obj's underlying member method code with example usage: obj.get_output_dim() and returns: self