最近復(fù)現(xiàn)代碼過程中，需要用到 torchtext.data 中的 Field 類。本篇博客記錄使用過程中的問題及解決方式。

1. 注意 torchtext 版本不宜過新

在較新版本的 torchtext.data 里面并沒有 Field 方法，這一點(diǎn)需要注意。

啟示：在復(fù)現(xiàn)別人代碼時(shí)，應(yīng)同時(shí)復(fù)制他們使用環(huán)境的版本信息。

2. 運(yùn)行下述代碼：

from torchtext.data import Field

SRC = Field(tokenize = tokenize_en, 
            init_token = '<sos>', 
            eos_token = '<eos>',
            fix_length = max_length,
            lower = True, 
            batch_first = True,
            sequential=True)

TRG = Field(tokenize = tokenize_en, 
            init_token = '<sos>', 
            eos_token = '<eos>', 
            fix_length = max_length,
            lower = True, 
            batch_first = True,
            sequential=True)

print(SRC.vocab.stoi["<sos>"])
print(TRG.vocab.stoi["<sos>"])

報(bào)錯(cuò)信息：

print(SRC.vocab.stoi["<sos>"])  # 2
AttributeError: 'Field' object has no attribute 'vocab'

于是查看 Field 類的定義，尋找和詞表建立相關(guān)的函數(shù)，發(fā)現(xiàn)其 build_vocab() 函數(shù)中有建立詞表的操作， build_vocab() 函數(shù)定義如下：

class Field(RawField):
	
	...
    
    def build_vocab(self, *args, **kwargs):
        """Construct the Vocab object for this field from one or more datasets.

        Arguments:
            Positional arguments: Dataset objects or other iterable data
                sources from which to construct the Vocab object that
                represents the set of possible values for this field. If
                a Dataset object is provided, all columns corresponding
                to this field are used; individual columns can also be
                provided directly.
            Remaining keyword arguments: Passed to the constructor of Vocab.
        """
        counter = Counter()
        sources = []
        for arg in args:
            if isinstance(arg, Dataset):
                sources += [getattr(arg, name) for name, field in
                            arg.fields.items() if field is self]
            else:
                sources.append(arg)
        for data in sources:
            for x in data:
                if not self.sequential:
                    x = [x]
                try:
                    counter.update(x)
                except TypeError:
                    counter.update(chain.from_iterable(x))
        specials = list(OrderedDict.fromkeys(
            tok for tok in [self.unk_token, self.pad_token, self.init_token,
                            self.eos_token] + kwargs.pop('specials', [])
            if tok is not None))
        self.vocab = self.vocab_cls(counter, specials=specials, **kwargs)
	
	...

解決方式：在程序中 Field 定義后添加 SRC.build_vocab() 和 TRG.build_vocab()，程序變成：

SRC.build_vocab()
TRG.build_vocab()

print(SRC.vocab.stoi["<sos>"])  # 輸出結(jié)果：2
print(TRG.vocab.stoi["<sos>"])  # 輸出結(jié)果：2

至此，程序就會(huì)順利執(zhí)行啦！

參考資料文章來源地址http://www.zghlxwxcb.cn/news/detail-539560.html

1. python - BucketIterator 拋出 ‘Field’ 對(duì)象沒有屬性 ‘vocab’ - IT工具網(wǎng) (coder.work)
2. ImportError: cannot import name ‘Field‘ from ‘torchtext.data‘, No module named “l(fā)egacy“_no module named 'torchtext.legacy_御用廚師的博客-CSDN博客

到了這里，關(guān)于成功解決 AttributeError: ‘Field‘ object has no attribute ‘vocab‘的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！