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.
docstr: Returns if the Parameters are valid or Not
code: def _valid_params(self):
      """Returns if the Parameters are valid or Not"""
      return super()._valid_params() + ["model"]
  
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 3 for calling the GoogleVertexAI obj's underlying member method code with example usage: obj._valid_params() and returns: unknown