class_docstr: Google Palm LLM
  BaseGoogle class is extended for Google Palm model. The default and only model
  support at the moment is models/text-bison-001.
docstr: A method to Validate the Model
code: def _validate(self):
      """
      A method to Validate the Model
  
      """
  
      super()._validate()
  
      if not self.model:
          raise ValueError("model is required.")
  
file_path: pandas-ai/pandasai/llm/google_palm.py
imports: from .base import BaseGoogle
  from typing import Any
  from ..helpers.optional import import_dependency
  from ..exceptions import APIKeyNotFoundError
label_desc: Use image node_id 4 for calling the GooglePalm obj's underlying member method code with example usage: obj._validate() without return types