message: Minor update to keras metric_util for python imports.
  Use the module import rather than directly access the function within the module.
diff: @@ -39,7 +39,7 @@ from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops import variables as variables_module
  from tensorflow.python.ops import weights_broadcast_ops
  -from tensorflow.python.ops.parallel_for.control_flow_ops import vectorized_map
  +from tensorflow.python.ops.parallel_for import control_flow_ops as parallel_control_flow_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.util import tf_decorator
  @@ -432,9 +432,9 @@ def _update_confusion_matrix_variables_optimized(
  label, bucket_index = label_and_bucket_index[0], label_and_bucket_index[1]
  return math_ops.unsorted_segment_sum(
  data=label, segment_ids=bucket_index, num_segments=num_thresholds)
  - tp_bucket_v = vectorized_map(
  + tp_bucket_v = parallel_control_flow_ops.vectorized_map(
  gather_bucket, (true_labels, bucket_indices))
  - fp_bucket_v = vectorized_map(
  + fp_bucket_v = parallel_control_flow_ops.vectorized_map(
  gather_bucket, (false_labels, bucket_indices))
  tp = array_ops.transpose_v2(
  math_ops.cumsum(tp_bucket_v, reverse=True, axis=1))
  