mindspore.dataset.text.Lookup
- class mindspore.dataset.text.Lookup(vocab, unknown_token=None, data_type=mstype.int32)[source]
Look up a word into an id according to the input vocabulary table.
- Parameters
vocab (Vocab) – A vocabulary object.
unknown_token (str, optional) – Word is used for lookup. In case of the word is out of vocabulary (OOV), the result of lookup will be replaced with unknown_token. If the unknown_token is not specified or it is OOV, runtime error will be thrown. Default:
None
, means no unknown_token is specified.data_type (mindspore.dtype, optional) – The data type that lookup operation maps string to. Default:
mstype.int32
.
- Raises
- Supported Platforms:
CPU
Examples
>>> import mindspore.dataset as ds >>> import mindspore.dataset.text as text >>> # Load vocabulary from list >>> vocab = text.Vocab.from_list(['深', '圳', '欢', '迎', '您']) >>> # Use Lookup operation to map tokens to ids >>> lookup = text.Lookup(vocab) >>> >>> text_file_list = ["/path/to/text_file_dataset_file"] >>> text_file_dataset = ds.TextFileDataset(dataset_files=text_file_list) >>> text_file_dataset = text_file_dataset.map(operations=[lookup])
- Tutorial Examples: