code: def visit(self, node):
      super(_CtxClearer, self).visit(node)
      if hasattr(node, "ctx"):
          node.ctx = None
      return node
  
imports: import types
  from absl.testing import parameterized
  import gast
  from tensorflow.python.autograph.pyct import loader
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.autograph.pyct import templates
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the _CtxClearer obj's underlying member method code with example usage: obj.visit(node) and returns: node