code: def allow_only_uint8(dtypes, augmenter=None):
      """Verify that input dtypes are uint8.
  
      Added in 0.5.0.
  
      Parameters
      ----------
      dtypes : numpy.ndarray or iterable of numpy.ndarray or iterable of numpy.dtype
          One or more input dtypes to verify.
  
      augmenter : None or imgaug.augmenters.meta.Augmenter, optional
          If the gating happens for an augmenter, it should be provided
          here. This information will be used to improve output error
          messages and warnings.
  
      """
      return gate_dtypes_strs(
          dtypes,
          allowed="uint8",
          disallowed="uint16 uint32 uint64 "
          "int8 int16 int32 int64 "
          "float16 float32 float64 float128 "
          "bool",
          augmenter=augmenter,
      )
  
imports: from __future__ import print_function, division, absolute_import
  import numpy
  import six.moves
  import imgaug
label_desc: Use image node_id 21 for calling a global function with example usage: allow_only_uint8(dtypes, augmenter) and returns: gate_dtypes_strs