code: def _initialize(self) -> _typing.Optional[bool]:
      dimensions = list(self.hyper_parameters["hidden"])
      concat_last = True
      if (
          self.final_dimension not in (Ellipsis, None)
          and isinstance(self.final_dimension, int)
          and self.final_dimension > 0
      ):
          dimensions.append(self.final_dimension)
          concat_last = False
      logging.debug("current dimensions %s", dimensions)
      self._encoder = _GAT(
          self.input_dimension,
          dimensions,
          self.hyper_parameters.get("num_hidden_heads"),
          self.hyper_parameters.get("num_output_heads"),
          self.hyper_parameters["dropout"],
          self.hyper_parameters["act"],
          concat_last=concat_last,
      )
      return True
  
file_path: AutoGL/autogl/module/model/encoders/_pyg/_gat.py
imports: import logging
  import torch.nn.functional
  import typing
  import torch_geometric
  from torch_geometric.nn.conv import GATConv
  from ..None import base_encoder, encoder_registry
  from ...None import _utils
label_desc: Use image node_id 1 for calling the GATEncoderMaintainer obj's underlying member method code with example usage: obj._initialize() and returns: True