code: def merge_relative_path(dst_path, rel_path):
      """Merge a relative tar file to a destination (which can be "gs://...")."""
      # Convert rel_path to be relative and normalize it to remove ".", "..", "//",
      # which are valid directories in fileystems like "gs://".
      norm_rel_path = os.path.normpath(rel_path.lstrip("/"))
  
      if norm_rel_path == ".":
          return dst_path
  
      # Check that the norm rel path does not starts with "..".
      if norm_rel_path.startswith(".."):
          raise ValueError("Relative path %r is invalid." % rel_path)
  
      merged = os.path.join(dst_path, norm_rel_path)
  
      # After merging verify that the merged path keeps the original dst_path.
      if not merged.startswith(dst_path):
          raise ValueError(
              "Relative path %r is invalid. Failed to merge with %r."
              % (rel_path, dst_path)
          )
      return merged
  
imports: import os
  import tarfile
  import tensorflow
label_desc: Use image node_id 3 for calling a global function with example usage: merge_relative_path(dst_path, rel_path) and returns: merged, dst_path