ImportError: cannot import name 'PretrainedBertIndexer'

[Mayar2009]

when trying to understand
bert_text_classification.ipynb

this part of notebook

from allennlp.data.token_indexers import PretrainedBertIndexer

token_indexer = PretrainedBertIndexer(
pretrained_model="bert-base-uncased",
max_pieces=config.max_seq_len,
do_lowercase=True,
)

apparently we need to truncate the sequence here, which is a stupid design decision

def tokenizer(s: str):
return token_indexer.wordpiece_tokenizer(s)[:config.max_seq_len - 2]

gives this error

ImportError Traceback (most recent call last)
in ()
----> 1 from allennlp.data.token_indexers import PretrainedBertIndexer
2
3 token_indexer = PretrainedBertIndexer(
4 pretrained_model="bert-base-uncased",
5 max_pieces=config.max_seq_len,

ImportError: cannot import name 'PretrainedBertIndexer'

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allennlp version used is 1.0.0

seems version differ , I could not find the solution
what should I do?