transformers---FloatProgress not found. Please update jupyter and ipywidgets.

问题

运行 huggingface transformers 的 demo，报错FloatProgress not found。具体如下：

import torch
from transformers import BertTokenizer, BertModel, BertForMaskedLM

import logging
logging.basicConfig(level=logging.INFO)

tokenizer = BertTokenizer.from_pretrained('bert-base-uncased')

报错：

filelock:Lock 140228336084248 acquired on
......
ImportError: IntProgress not found. Please update jupyter and ipywidgets.

解决：

添加 from ipywidgets import IntProgress

import torch
from ipywidgets import IntProgress
from transformers import BertTokenizer, BertModel, BertForMaskedLM

import logging
logging.basicConfig(level=logging.INFO)

tokenizer = BertTokenizer.from_pretrained('bert-base-uncased')