class_docstr: List of maps that describe what changed in the API.
code: def preprocess(self, root_node, after_compat_v1_upgrade=False):
      visitor = ast_edits.PastaAnalyzeVisitor(TFAPIImportAnalysisSpec())
      visitor.visit(root_node)
      detections = set(visitor.results)
  
      # Upgrade explicit compat v1 imports if `upgrade_compat_v1_import` is
      # enabled. Then preprocess the updated root node.
      # We only do this upgrading once, because some forms of the import may
      # still cause errors but aren't trivially upgradeable, and we don't want
      # to enter an infinite loop. E.g. `from tensorflow.compat import v1, v2`.
      if (
          compat_v1_import in detections
          and self.upgrade_compat_v1_import
          and not after_compat_v1_upgrade
      ):
          CompatV1ImportReplacer().visit(root_node)
          return self.preprocess(
              root_node, after_compat_v1_upgrade=True
          )
  
      # If we have detected the presence of imports of specific TF versions,
      # We want to modify the update spec to check only module deprecations
      # and skip all other conversions.
      if detections:
          self.function_handle = {}
          self.function_reorders = {}
          self.function_keyword_renames = {}
          self.symbol_renames = {}
          self.function_warnings = {}
          self.change_to_function = {}
          self.module_deprecations = (
              module_deprecations_v2.MODULE_DEPRECATIONS
          )
          self.function_transformers = {}
          self.import_renames = {}
      return root_node, visitor.log, visitor.warnings_and_errors
  
imports: import ast
  import copy
  import functools
  import sys
  import pasta
  from tensorflow.tools.compatibility import all_renames_v2
  from tensorflow.tools.compatibility import ast_edits
  from tensorflow.tools.compatibility import module_deprecations_v2
  from tensorflow.tools.compatibility import reorders_v2
label_desc: Use image node_id 2 for calling the TFAPIChangeSpec obj's underlying member method code with example usage: obj.preprocess(root_node, after_compat_v1_upgrade) and returns: root_node,  visitor,  visitor, self