code: def visit_git_ref(self, value: GitRef) -> Ret:
      pass
  
imports: import abc
  from typing import Generic, List, Type, TypeVar
  from neptune.attributes.attribute import Attribute
  from neptune.types import Artifact, Boolean, Datetime, File, FileSeries, FileSet, Float, FloatSeries, GitRef, Integer, String, StringSeries, StringSet
  from neptune.types.namespace import Namespace
  from neptune.types.value import Value
label_desc: Use image node_id 14 for calling the ValueVisitor obj's underlying member method code with example usage: obj.visit_git_ref(value) without return types