spaCy/website/docs/usage/v2-3.md

---
title: What's New in v2.3
teaser: New features, backwards incompatibilities and migration guide
menu:
  - ['New Features', 'features']
  - ['Backwards Incompatibilities', 'incompat']
  - ['Migrating from v2.2', 'migrating']
---

## New Features {#features hidden="true"}

spaCy v2.3 features new pretrained models for five languages, word vectors for
all language models, and decreased model size and loading times for models with
vectors. We've added pretrained models for **Chinese, Danish, Japanese, Polish
and Romanian** and updated the training data and vectors for most languages.
Model packages with vectors are about **2&times** smaller on disk and load
**2-4×** faster. For the full changelog, see the
[release notes on GitHub](https://github.com/explosion/spaCy/releases/tag/v2.3.0).
For more details and a behind-the-scenes look at the new release,
[see our blog post](https://explosion.ai/blog/spacy-v2-3).

### Expanded model families with vectors {#models}

> #### Example
>
> ```bash
> python -m spacy download da_core_news_sm
> python -m spacy download ja_core_news_sm
> python -m spacy download pl_core_news_sm
> python -m spacy download ro_core_news_sm
> python -m spacy download zh_core_web_sm
> ```

With new model families for Chinese, Danish, Polish, Romanian and Chinese plus
`md` and `lg` models with word vectors for all languages, this release provides
a total of 46 model packages. For models trained using
[Universal Dependencies](https://universaldependencies.org) corpora, the
training data has been updated to UD v2.5 (v2.6 for Japanese, v2.3 for Polish)
and Dutch has been extended to include both UD Dutch Alpino and LassySmall.

<Infobox>

**Models:** [Models directory](/models) **Benchmarks: **
[Release notes](https://github.com/explosion/spaCy/releases/tag/v2.3.0)

</Infobox>

### Chinese {#chinese}

> #### Example
>
> ```python
> from spacy.lang.zh import Chinese
>
> # Load with "default" model provided by pkuseg
> cfg = {"pkuseg_model": "default", "require_pkuseg": True}
> nlp = Chinese(meta={"tokenizer": {"config": cfg}})
>
> # Append words to user dict
> nlp.tokenizer.pkuseg_update_user_dict(["中国", "ABC"])
> ```

This release adds support for
[`pkuseg`](https://github.com/lancopku/pkuseg-python) for word segmentation and
the new Chinese models ship with a custom pkuseg model trained on OntoNotes. The
Chinese tokenizer can be initialized with both `pkuseg` and custom models and
the `pkuseg` user dictionary is easy to customize. Note that
[`pkuseg`](https://github.com/lancopku/pkuseg-python) doesn't yet ship with
pre-compiled wheels for Python 3.8. See the
[usage documentation](/usage/models#chinese) for details on how to install it on
Python 3.8.

<Infobox>

**Models:** [Chinese models](/models/zh) **Usage: **
[Chinese tokenizer usage](/usage/models#chinese)

</Infobox>

### Japanese {#japanese}

The updated Japanese language class switches to
[`SudachiPy`](https://github.com/WorksApplications/SudachiPy) for word
segmentation and part-of-speech tagging. Using `SudachiPy` greatly simplifies
installing spaCy for Japanese, which is now possible with a single command:
`pip install spacy[ja]`.

<Infobox>

**Models:** [Japanese models](/models/ja) **Usage:**
[Japanese tokenizer usage](/usage/models#japanese)

</Infobox>

### Small CLI updates

- [`spacy debug-data`](/api/cli#debug-data) provides the coverage of the vectors
  in a base model with `spacy debug-data lang train dev -b base_model`
- [`spacy evaluate`](/api/cli#evaluate) supports `blank:lg` (e.g.
  `spacy evaluate blank:en dev.json`) to evaluate the tokenization accuracy
  without loading a model
- [`spacy train`](/api/cli#train) on GPU restricts the CPU timing evaluation to
  the first iteration

## Backwards incompatibilities {#incompat}

<Infobox title="Important note on models" variant="warning">

If you've been training **your own models**, you'll need to **retrain** them
with the new version. Also don't forget to upgrade all models to the latest
versions. Models for earlier v2 releases (v2.0, v2.1, v2.2) aren't compatible
with models for v2.3. To check if all of your models are up to date, you can run
the [`spacy validate`](/api/cli#validate) command.

</Infobox>

> #### Install with lookups data
>
> ```bash
> $ pip install spacy[lookups]
> ```
>
> You can also install
> [`spacy-lookups-data`](https://github.com/explosion/spacy-lookups-data)
> directly.

- If you're training new models, you'll want to install the package
  [`spacy-lookups-data`](https://github.com/explosion/spacy-lookups-data), which
  now includes both the lemmatization tables (as in v2.2) and the normalization
  tables (new in v2.3). If you're using pretrained models, **nothing changes**,
  because the relevant tables are included in the model packages.
- Due to the updated Universal Dependencies training data, the fine-grained
  part-of-speech tags will change for many provided language models. The
  coarse-grained part-of-speech tagset remains the same, but the mapping from
  particular fine-grained to coarse-grained tags may show minor differences.
- For French, Italian, Portuguese and Spanish, the fine-grained part-of-speech
  tagsets contain new merged tags related to contracted forms, such as `ADP_DET`
  for French `"au"`, which maps to UPOS `ADP` based on the head `"à"`. This
  increases the accuracy of the models by improving the alignment between
  spaCy's tokenization and Universal Dependencies multi-word tokens used for
  contractions.

### Migrating from spaCy 2.2 {#migrating}

#### Tokenizer settings

In spaCy v2.2.2-v2.2.4, there was a change to the precedence of `token_match`
that gave prefixes and suffixes priority over `token_match`, which caused
problems for many custom tokenizer configurations. This has been reverted in
v2.3 so that `token_match` has priority over prefixes and suffixes as in v2.2.1
and earlier versions.

A new tokenizer setting `url_match` has been introduced in v2.3.0 to handle
cases like URLs where the tokenizer should remove prefixes and suffixes (e.g., a
comma at the end of a URL) before applying the match. See the full
[tokenizer documentation](/usage/linguistic-features#tokenization) and try out
[`nlp.tokenizer.explain()`](/usage/linguistic-features#tokenizer-debug) when
debugging your tokenizer configuration.

#### Warnings configuration

spaCy's custom warnings have been replaced with native Python
[`warnings`](https://docs.python.org/3/library/warnings.html). Instead of
setting `SPACY_WARNING_IGNORE`, use the [`warnings`
filters](https://docs.python.org/3/library/warnings.html#the-warnings-filter)
to manage warnings.

```diff
import spacy
+ import warnings

- spacy.errors.SPACY_WARNING_IGNORE.append('W007')
+ warnings.filterwarnings("ignore", message=r"\\[W007\\]", category=UserWarning)
```

#### Normalization tables

The normalization tables have moved from the language data in
[`spacy/lang`](https://github.com/explosion/spaCy/tree/master/spacy/lang) to the
package [`spacy-lookups-data`](https://github.com/explosion/spacy-lookups-data).
If you're adding data for a new language, the normalization table should be
added to `spacy-lookups-data`. See
[adding norm exceptions](/usage/adding-languages#norm-exceptions).

#### No preloaded lexemes/vocab for models with vectors

To reduce the initial loading time, the lexemes in `nlp.vocab` are no longer
loaded on initialization for models with vectors. As you process texts, the
lexemes will be added to the vocab automatically, just as in models without
vectors.

To see the number of unique vectors and number of words with vectors, see
`nlp.meta['vectors']`, for example for `en_core_web_md` there are `20000`
unique vectors and `684830` words with vectors:

```python
{
    'width': 300,
    'vectors': 20000,
    'keys': 684830,
    'name': 'en_core_web_md.vectors'
}
```

If required, for instance if you are working directly with word vectors rather
than processing texts, you can load all lexemes for words with vectors at once:

```python
for orth in nlp.vocab.vectors:
    _ = nlp.vocab[orth]
```

#### Lexeme.is_oov and Token.is_oov

<Infobox title="Important note" variant="warning">

Due to a bug, the values for `is_oov` are reversed in v2.3.0, but this will be
fixed in the next patch release v2.3.1.

</Infobox>

In v2.3, `Lexeme.is_oov` and `Token.is_oov` are `True` if the lexeme does not
have a word vector. This is equivalent to `token.orth not in
nlp.vocab.vectors`.

Previously in v2.2, `is_oov` corresponded to whether a lexeme had stored
probability and cluster features. The probability and cluster features are no
longer included in the provided medium and large models (see the next section).

#### Probability and cluster features

> #### Load and save extra prob lookups table
>
> ```python
> from spacy.lang.en import English
> nlp = English()
> doc = nlp("the")
> print(doc[0].prob) # lazily loads extra prob table
> nlp.to_disk("/path/to/model") # includes prob table
> ```

The `Token.prob` and `Token.cluster` features, which are no longer used by the
core pipeline components as of spaCy v2, are no longer provided in the
pretrained models to reduce the model size. To keep these features available for
users relying on them, the `prob` and `cluster` features for the most frequent
1M tokens have been moved to
[`spacy-lookups-data`](https://github.com/explosion/spacy-lookups-data) as
`extra` features for the relevant languages (English, German, Greek and
Spanish).

The extra tables are loaded lazily, so if you have `spacy-lookups-data`
installed and your code accesses `Token.prob`, the full table is loaded into the
model vocab, which will take a few seconds on initial loading. When you save
this model after loading the `prob` table, the full `prob` table will be saved
as part of the model vocab.

If you'd like to include custom `cluster`, `prob`, or `sentiment` tables as part
of a new model, add the data to
[`spacy-lookups-data`](https://github.com/explosion/spacy-lookups-data) under
the entry point `lg_extra`, e.g. `en_extra` for English. Alternatively, you can
initialize your [`Vocab`](/api/vocab) with the `lookups_extra` argument with a
[`Lookups`](/api/lookups) object that includes the tables `lexeme_cluster`,
`lexeme_prob`, `lexeme_sentiment` or `lexeme_settings`. `lexeme_settings` is
currently only used to provide a custom `oov_prob`. See examples in the
[`data` directory](https://github.com/explosion/spacy-lookups-data/tree/master/spacy_lookups_data/data)
in `spacy-lookups-data`.

#### Initializing new models without extra lookups tables

When you initialize a new model with [`spacy init-model`](/api/cli#init-model),
the `prob` table from `spacy-lookups-data` may be loaded as part of the
initialization. If you'd like to omit this extra data as in spaCy's provided
v2.3 models, use the new flag `--omit-extra-lookups`.