code: def pydantic_model_definition(self):
      from pydantic import BaseModel, root_validator, validator
  
      class UserModel(BaseModel):
          name: str
          username: str
          password1: str
          password2: str
  
          @validator("name")
          def name_must_contain_space(cls, v):
              if " " not in v:
                  raise ValueError("must contain a space")
              return v.title()
  
          @root_validator()
          def passwords_should_match(cls, values):
              if values["password1"] != values["password2"]:
                  raise ValueError("passwords do not match")
              return values
  
      UserModel(
          name="John Doe",
          username="johndoe",
          password1="abcd",
          password2="abcd",
      )
  
imports: import os.path
  import sys
  import unittest
  from io import StringIO
  from unittest import IsolatedAsyncioTestCase
  from unittest.mock import Mock, patch
  import matplotlib
  import pytest
  from streamlit import config
  from streamlit.web import bootstrap
  from streamlit.web.bootstrap import NEW_VERSION_TEXT, _fix_pydantic_duplicate_validators_error
  from tests import testutil
  from tests.testutil import patch_config_options, should_skip_pydantic_tests
label_desc: Use image node_id 1 for calling the BootstrapPydanticFixTest obj's underlying member method code with example usage: obj.pydantic_model_definition() and returns: v, values