code: def find_project_root(filename=None):
      """
      Check if Custom workspace path provide use that otherwise iterate to
      find project root
      """
      if "PANDASAI_WORKSPACE" in os.environ:
          workspace_path = os.environ["PANDASAI_WORKSPACE"]
          if (
              workspace_path
              and os.path.exists(workspace_path)
              and os.path.isdir(workspace_path)
          ):
              return workspace_path
          raise InvalidWorkspacePathError(
              "PANDASAI_WORKSPACE does not point to a valid directory"
          )
  
      # Get the path of the file that is be
      # ing executed
      current_file_path = os.path.abspath(os.getcwd())
  
      # Navigate back until we either find a $filename file or there is no parent
      # directory left.
      root_folder = current_file_path
      while True:
          # Custom way to identify the project root folder
          if filename is not None:
              env_file_path = os.path.join(root_folder, filename)
              if os.path.isfile(env_file_path):
                  break
  
          # Most common ways to identify a project root folder
          if (
              os.path.isfile(
                  os.path.join(root_folder, "pyproject.toml")
              )
              or os.path.isfile(os.path.join(root_folder, "setup.py"))
              or os.path.isfile(
                  os.path.join(root_folder, "requirements.txt")
              )
              or os.path.isfile(
                  os.path.join(root_folder, "pandasai.json")
              )
          ):
              break
  
          parent_folder = os.path.dirname(root_folder)
          if parent_folder == root_folder:
              # if project root is not found return cwd
              return os.getcwd()
  
          root_folder = parent_folder
  
      return root_folder
  
imports: import os
  from pandasai.exceptions import InvalidWorkspacePathError
label_desc: Use image node_id 1 for calling a global function with example usage: find_project_root(filename) and returns: root_folder, workspace_path, os