code: def dummy_generate(histories):
      for i in range(len(histories)):
          histories[i].append_segment(
              "<request><DummyTool>test<call>",
              torch.tensor([1, 2, 3]),
              system=False,
          )
      return histories
  
imports: import unittest
  from unittest.mock import patch
  import torch
  from transformers import AutoTokenizer
  from trl import AutoModelForCausalLMWithValueHead, TextEnvironment, TextHistory
label_desc: Use image node_id 1 for calling a global function with example usage: dummy_generate(histories) and returns: histories