class_docstr: Google Palm Vertexai LLM
  BaseGoogle class is extended for Google Palm model using Vertexai.
  The default model support at the moment is text-bison-001.
  However, user can choose to use code-bison-001 too.
code: def type(self) -> str:
      return "google-vertexai"
  
file_path: pandas-ai/pandasai/llm/google_vertexai.py
imports: from typing import Optional
  from .base import BaseGoogle
  from ..exceptions import UnsupportedModelError
  from ..helpers.optional import import_dependency
label_desc: Use image node_id 6 for calling the GoogleVertexAI obj's underlying member method code with example usage: obj.type() and returns: str