code: def coerce_to_structurally_valid_utf8(
      input, replacement_char=_unichr(65533), name=None
  ):
      r"""Coerce UTF-8 input strings to structurally valid UTF-8.
  
      Any bytes which cause the input string to be invalid UTF-8 are substituted
      with the provided replacement character codepoint (default 65533). If you plan
      on overriding the default, use a single byte replacement character codepoint
      to preserve alignment to the source input string.
  
      In this example, the character \xDEB2 is an invalid UTF-8 bit sequence; the
      call to `coerce_to_structurally_valid_utf8` replaces it with \xef\xbf\xbd,
      which is the default replacement character encoding.
      >>> input_data = ["A", b"\xDEB2", "C"]
      >>> coerce_to_structurally_valid_utf8(input_data)
      <tf.Tensor: shape=(3,), dtype=string,
                  numpy=array([b'A', b'\xef\xbf\xbdB2', b'C'], dtype=object)>
  
      Args:
        input: UTF-8 string tensor to coerce to valid UTF-8.
        replacement_char: The replacement character to be used in place of any
            invalid byte in the input. Any valid Unicode character may be used. The
            default value is the default Unicode replacement character which is
            0xFFFD (or U+65533). Note that passing a replacement character
            expressible in 1 byte, such as ' ' or '?', will preserve string
            alignment to the source since individual invalid bytes will be replaced
            with a 1-byte replacement. (optional)
        name: A name for the operation (optional).
  
      Returns:
        A tensor of type string with the same shape as the input.
      """
      return string_ops.unicode_transcode(
          input,
          input_encoding="UTF-8",
          output_encoding="UTF-8",
          errors="replace",
          replacement_char=ord(replacement_char),
          name=name,
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensorflow.python.ops import string_ops
label_desc: Use image node_id 2 for calling a global function with example usage: coerce_to_structurally_valid_utf8(input, replacement_char, name) and returns: string_ops