code: def len_to_padding(length, maxlen=None, dtype=tf.bool):
      """convert length to padding flag"""
      # (B) -> (B, T)
      return tf.cast(
          1 - len_to_mask(length, maxlen=maxlen, dtype=dtype), dtype
      )
  
imports: import os
  from absl import logging
  import numpy
  import delta.compat
  from tensorflow.python.client import device_lib
  from tensorflow.python.estimator.canned import metric_keys
  from tensorflow.python.util import nest
  from delta.utils.register import registers
label_desc: Use image node_id 3 for calling a global function with example usage: len_to_padding(length, maxlen, dtype) and returns: tf