code: def initialize_minibatch(self) -> Dict[str, Any]:
      return {
          "node_data": self.__str_node_annotation.initialize_minibatch(),
          "is_candidate": [],
      }
  
imports: import torch
  from torch import nn
  from typing import Any, Dict, Tuple
  from ptgnn.baseneuralmodel import AbstractNeuralModel
  from ptgnn.neuralmodels.embeddings.strelementrepresentationmodel import StrElementRepresentationModel
  from ptgnn.neuralmodels.gnn.structs import AbstractNodeEmbedder
label_desc: Use image node_id 5 for calling the CandidateNodeAnnotationModel obj's underlying member method code with example usage: obj.initialize_minibatch() and returns: dict