code: def ast_to_gast(node):
      return Ast3ToGAst().visit(node)
  
file_path: catboost/contrib/python/gast/gast/ast3.py
imports: from gast.astn import AstToGAst, GAstToAst
  import gast
  import ast
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: ast_to_gast(node) and returns: Ast3ToGAst