class_docstr: TextSet wraps a set of texts with status.
code: def transform(self, transformer):
      return TextSet(
          callZooFunc(
              self.bigdl_type,
              "transformTextSet",
              transformer,
              self.value,
          ),
          self.bigdl_type,
      )
  
imports: import six
  from bigdl.dllib.utils.common import JavaValue
  from bigdl.dllib.utils.file_utils import callZooFunc
  from pyspark import RDD
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 22 for calling the TextSet obj's underlying member method code with example usage: obj.transform(transformer) and returns: TextSet