彻底解决Tensorflow2.0 使用tensorflow_datasets出现unbalanced parenthesis错误

安装tensorflow2.0和安装tensorflow_datasets

pip install tensorflow==2.0.0-alpha0
pip install tensorflow_datasets

运行以下代码会发生错误：

import tensorflow_datasets as tfds
import tensorflow as tfdataset, info = tfds.load('imdb_reviews/subwords8k',with_info=True, as_supervised=True)
train_dataset, test_dataset = dataset['train'], dataset['test']tokenizer = info.features['text'].encoder
print ('Vocabulary size: {}'.format(tokenizer.vocab_size))sample_string = 'TensorFlow is cool.'
tokenized_string = tokenizer.encode(sample_string)
print ('Tokenized string is {}'.format(tokenized_string))

错误信息:

File "D:\newmyeclipseworkspace\Attention\src\tensorflow2\testRNN.py", line 11, in <module>dataset, info = tfds.load('imdb_reviews/subwords8k',with_info=True, as_supervised=True)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\wrapt\wrappers.py", line 564, in __call__args, kwargs)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\api_utils.py", line 52, in disallow_positional_args_decreturn fn(*args, **kwargs)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\registered.py", line 253, in loaddbuilder.download_and_prepare(**download_and_prepare_kwargs)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\wrapt\wrappers.py", line 603, in __call__args, kwargs)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\api_utils.py", line 52, in disallow_positional_args_decreturn fn(*args, **kwargs)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\dataset_builder.py", line 218, in download_and_preparemax_examples_per_split=download_config.max_examples_per_split)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\dataset_builder.py", line 667, in _download_and_prepareoutput_files,File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\file_format_adapter.py", line 107, in write_from_generator_write_tfrecords_from_generator(wrapped, output_files, shuffle=True)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\file_format_adapter.py", line 272, in _write_tfrecords_from_generator_round_robin_write(writers, generator)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\file_format_adapter.py", line 285, in _round_robin_writefor i, example in enumerate(tqdm.tqdm(generator, unit=" examples")):File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tqdm\_tqdm.py", line 1022, in __iter__for obj in iterable:File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\file_format_adapter.py", line 106, in <genexpr>_dict_to_tf_example(d).SerializeToString() for d in generator_fn())File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\core\dataset_builder.py", line 637, in generator_fnfor i, ex in enumerate(self._generate_examples(**kwargs)):File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\site-packages\tensorflow_datasets\text\imdb.py", line 148, in _generate_examplesreg = re.compile(os.path.join("^%s" % directory, "(?P<label>neg|pos)", ""))File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\re.py", line 234, in compilereturn _compile(pattern, flags)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\re.py", line 286, in _compilep = sre_compile.compile(pattern, flags)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\sre_compile.py", line 764, in compilep = sre_parse.parse(p, flags)File "C:\Users\admin\AppData\Local\Programs\Python\Python37\lib\sre_parse.py", line 944, in parseraise source.error("unbalanced parenthesis")
re.error: unbalanced parenthesis at position 32

解决方法:
进入xxx\Python37\Lib\site-packages\tensorflow_datasets\text\imdb.py
修改一下代码:

 def _generate_examples(self, archive, directory):"""Generate IMDB examples."""#reg = re.compile(os.path.join("^%s" % directory, "(?P<label>neg|pos)", ""))reg = re.compile("aclImdb\\\\(train|test)\\\\(?P<label>neg|pos)\\\\")for path, imdb_f in archive:res = reg.match(path)if not res:continuetext = imdb_f.read().strip()yield {"text": text,"label": res.groupdict()["label"],}

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