spaCy/website/docs/usage/index.md

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Install spaCy	/usage/models	Quickstart quickstart Instructions installation Troubleshooting troubleshooting Changelog changelog

Quickstart

📖 Looking for the old docs?

To help you make the transition from v2.x to v3.0, we've uploaded the old website to v2.spacy.io. To see what's changed and how to migrate, see the v3.0 guide.

import QuickstartInstall from 'widgets/quickstart-install.js'

Installation instructions

spaCy is compatible with 64-bit CPython 3.6+ and runs on Unix/Linux, macOS/OS X and Windows. The latest spaCy releases are available over pip and conda.

pip

Using pip, spaCy releases are available as source packages and binary wheels. Before you install spaCy and its dependencies, make sure that your pip, setuptools and wheel are up to date.

Download pipelines

After installation you typically want to download a trained pipeline. For more info and available packages, see the models directory.

$ python -m spacy download en_core_web_sm

>>> import spacy
>>> nlp = spacy.load("en_core_web_sm")

$ pip install -U pip setuptools wheel
$ pip install -U %%SPACY_PKG_NAME%%SPACY_PKG_FLAGS

When using pip it is generally recommended to install packages in a virtual environment to avoid modifying system state:

$ python -m venv .env
$ source .env/bin/activate
$ pip install -U pip setuptools wheel
$ pip install -U %%SPACY_PKG_NAME%%SPACY_PKG_FLAGS

spaCy also lets you install extra dependencies by specifying the following keywords in brackets, e.g. spacy[ja] or spacy[lookups,transformers] (with multiple comma-separated extras). See the [options.extras_require] section in spaCy's setup.cfg for details on what's included.

Example

$ pip install %%SPACY_PKG_NAME[lookups,transformers]%%SPACY_PKG_FLAGS

Name	Description
lookups	Install spacy-lookups-data for data tables for lemmatization and lexeme normalization. The data is serialized with trained pipelines, so you only need this package if you want to train your own models.
transformers	Install spacy-transformers. The package will be installed automatically when you install a transformer-based pipeline.
ray	Install spacy-ray to add CLI commands for parallel training.
cuda, ...	Install spaCy with GPU support provided by CuPy for your given CUDA version. See the GPU installation instructions for details and options.
apple	Install thinc-apple-ops to improve performance on an Apple M1.
ja, ko, th	Install additional dependencies required for tokenization for the languages.

conda

Thanks to our great community, we've been able to re-add conda support. You can also install spaCy via conda-forge:

$ conda install -c conda-forge spacy

For the feedstock including the build recipe and configuration, check out this repository. Note that we currently don't publish any pre-releases on conda.

Upgrading spaCy

Upgrading from v2 to v3

Although we've tried to keep breaking changes to a minimum, upgrading from spaCy v2.x to v3.x may still require some changes to your code base. For details see the sections on backwards incompatibilities and migrating. Also remember to download the new trained pipelines, and retrain your own pipelines.

When updating to a newer version of spaCy, it's generally recommended to start with a clean virtual environment. If you're upgrading to a new major version, make sure you have the latest compatible trained pipelines installed, and that there are no old and incompatible packages left over in your environment, as this can often lead to unexpected results and errors. If you've trained your own models, keep in mind that your train and runtime inputs must match. This means you'll have to retrain your pipelines with the new version.

spaCy also provides a validate command, which lets you verify that all installed pipeline packages are compatible with your spaCy version. If incompatible packages are found, tips and installation instructions are printed. It's recommended to run the command with python -m to make sure you're executing the correct version of spaCy.

$ pip install -U %%SPACY_PKG_NAME%%SPACY_PKG_FLAGS
$ python -m spacy validate

Run spaCy with GPU

As of v2.0, spaCy comes with neural network models that are implemented in our machine learning library, Thinc. For GPU support, we've been grateful to use the work of Chainer's CuPy module, which provides a numpy-compatible interface for GPU arrays.

spaCy can be installed for a CUDA-compatible GPU by specifying spacy[cuda], spacy[cuda102], spacy[cuda112], spacy[cuda113], etc. If you know your CUDA version, using the more explicit specifier allows CuPy to be installed via wheel, saving some compilation time. The specifiers should install cupy.

$ pip install -U %%SPACY_PKG_NAME[cuda113]%%SPACY_PKG_FLAGS

Once you have a GPU-enabled installation, the best way to activate it is to call spacy.prefer_gpu or spacy.require_gpu() somewhere in your script before any pipelines have been loaded. require_gpu will raise an error if no GPU is available.

import spacy

spacy.prefer_gpu()
nlp = spacy.load("en_core_web_sm")

Compile from source

The other way to install spaCy is to clone its GitHub repository and build it from source. That is the common way if you want to make changes to the code base. You'll need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip and git installed. The compiler part is the trickiest. How to do that depends on your system. See notes on Ubuntu, macOS / OS X and Windows for details.

$ python -m pip install -U pip setuptools wheel # install/update build tools
$ git clone https://github.com/explosion/spaCy  # clone spaCy
$ cd spaCy                                      # navigate into dir
$ python -m venv .env                           # create environment in .env
$ source .env/bin/activate                      # activate virtual env
$ pip install -r requirements.txt               # install requirements
$ pip install --no-build-isolation --editable . # compile and install spaCy

To install with extras:

$ pip install --no-build-isolation --editable .[lookups,cuda102]

How to install compilers and related build tools:

• Ubuntu: Install system-level dependencies via apt-get: sudo apt-get install build-essential python-dev git
• macOS / OS X: Install a recent version of XCode, including the so-called "Command Line Tools". macOS and OS X ship with Python and Git preinstalled.
• Windows: Install a version of the Visual C++ Build Tools or Visual Studio Express that matches the version that was used to compile your Python interpreter.

Using build constraints when compiling from source

If you install spaCy from source or with pip for platforms where there are not binary wheels on PyPI, you may need to use build constraints if any package in your environment requires an older version of numpy.

If numpy gets downgraded from the most recent release at any point after you've compiled spacy, you might see an error that looks like this:

numpy.ndarray size changed, may indicate binary incompatibility.

To fix this, create a new virtual environment and install spacy and all of its dependencies using build constraints. Build constraints specify an older version of numpy that is only used while compiling spacy, and then your runtime environment can use any newer version of numpy and still be compatible. In addition, use --no-cache-dir to ignore any previously cached wheels so that all relevant packages are recompiled from scratch:

PIP_CONSTRAINT=https://raw.githubusercontent.com/explosion/spacy/master/build-constraints.txt \
pip install spacy --no-cache-dir

Our build constraints currently specify the oldest supported numpy available on PyPI for x86_64 and aarch64. Depending on your platform and environment, you may want to customize the specific versions of numpy. For other platforms, you can have a look at SciPy's oldest-supported-numpy package to see what the oldest recommended versions of numpy are.

(Warning: don't use pip install -c constraints.txt instead of PIP_CONSTRAINT, since this isn't applied to the isolated build environments.)

Additional options for developers

Some additional options may be useful for spaCy developers who are editing the source code and recompiling frequently.

• Install in editable mode. Changes to .py files will be reflected as soon as the files are saved, but edits to Cython files (.pxd, .pyx) will require the pip install command below to be run again. Before installing in editable mode, be sure you have removed any previous installs with pip uninstall spacy, which you may need to run multiple times to remove all traces of earlier installs.

  $ pip install -r requirements.txt
  $ pip install --no-build-isolation --editable .
  

• Build in parallel. Starting in v3.4.0, you can specify the number of build jobs with the environment variable SPACY_NUM_BUILD_JOBS:

  $ pip install -r requirements.txt
  $ SPACY_NUM_BUILD_JOBS=4 pip install --no-build-isolation --editable .
  

• For editable mode and parallel builds with python setup.py instead of pip (no longer recommended):

  $ pip install -r requirements.txt
  $ python setup.py build_ext --inplace -j 4
  $ python setup.py develop
  

Building an executable

The spaCy repository includes a Makefile that builds an executable zip file using pex (Python Executable). The executable includes spaCy and all its package dependencies and only requires the system Python at runtime. Building an executable .pex file is often the most convenient way to deploy spaCy, as it lets you separate the build from the deployment process.

Usage

To use a .pex file, just replace python with the path to the file when you execute your code or CLI commands. This is equivalent to running Python in a virtual environment with spaCy installed.

$ ./spacy.pex my_script.py
$ ./spacy.pex -m spacy info

$ git clone https://github.com/explosion/spaCy
$ cd spaCy
$ make

You can configure the build process with the following environment variables:

Variable	Description
SPACY_EXTRAS	Additional Python packages to install alongside spaCy with optional version specifications. Should be a string that can be passed to pip install. See Makefile for defaults.
PYVER	The Python version to build against. This version needs to be available on your build and runtime machines. Defaults to 3.6.
WHEELHOUSE	Directory to store the wheel files during compilation. Defaults to ./wheelhouse.

Run tests

spaCy comes with an extensive test suite. In order to run the tests, you'll usually want to clone the repository and build spaCy from source. This will also install the required development dependencies and test utilities defined in the requirements.txt.

Alternatively, you can find out where spaCy is installed and run pytest on that directory. Don't forget to also install the test utilities via spaCy's requirements.txt:

$ python -c "import os; import spacy; print(os.path.dirname(spacy.__file__))"
$ pip install -r path/to/requirements.txt
$ python -m pytest --pyargs %%SPACY_PKG_NAME

Calling pytest on the spaCy directory will run only the basic tests. The flag --slow is optional and enables additional tests that take longer.

$ python -m pip install -U pytest               # update pytest
$ python -m pytest --pyargs %%SPACY_PKG_NAME               # basic tests
$ python -m pytest --pyargs %%SPACY_PKG_NAME --slow        # basic and slow tests

Troubleshooting guide

This section collects some of the most common errors you may come across when installing, loading and using spaCy, as well as their solutions. Also see the Discussions FAQ Thread, which is updated more frequently and covers more transitory issues.

Help us improve this guide

Did you come across a problem like the ones listed here and want to share the solution? You can find the "Suggest edits" button at the bottom of this page that points you to the source. We always appreciate pull requests!

No compatible package found for [lang] (spaCy vX.X.X).

This usually means that the trained pipeline you're trying to download does not exist, or isn't available for your version of spaCy. Check the compatibility table to see which packages are available for your spaCy version. If you're using an old version, consider upgrading to the latest release. Note that while spaCy supports tokenization for a variety of languages, not all of them come with trained pipelines. To only use the tokenizer, import the language's Language class instead, for example from spacy.lang.fr import French.

Import Error: No module named spacy

This error means that the spaCy module can't be located on your system, or in your environment. Make sure you have spaCy installed. If you're using a virtual environment, make sure it's activated and check that spaCy is installed in that environment – otherwise, you're trying to load a system installation. You can also run which python to find out where your Python executable is located.

ImportError: No module named 'en_core_web_sm'

As of spaCy v1.7, all trained pipelines can be installed as Python packages. This means that they'll become importable modules of your application. If this fails, it's usually a sign that the package is not installed in the current environment. Run pip list or pip freeze to check which pipeline packages you have installed, and install the correct package if necessary. If you're importing a package manually at the top of a file, make sure to use the full name of the package.

command not found: spacy

This error may occur when running the spacy command from the command line. spaCy does not currently add an entry to your PATH environment variable, as this can lead to unexpected results, especially when using a virtual environment. Instead, spaCy adds an auto-alias that maps spacy to python -m spacy. If this is not working as expected, run the command with python -m, yourself – for example python -m spacy download en_core_web_sm. For more info on this, see the download command.

AttributeError: 'module' object has no attribute 'load'

While this could technically have many causes, including spaCy being broken, the most likely one is that your script's file or directory name is "shadowing" the module – e.g. your file is called spacy.py, or a directory you're importing from is called spacy. So, when using spaCy, never call anything else spacy.

If your training data only contained new entities and you didn't mix in any examples the model previously recognized, it can cause the model to "forget" what it had previously learned. This is also referred to as the "catastrophic forgetting problem". A solution is to pre-label some text, and mix it with the new text in your updates. You can also do this by running spaCy over some text, extracting a bunch of entities the model previously recognized correctly, and adding them to your training examples.

TypeError: unhashable type: 'list'

If you're training models, writing them to disk, and versioning them with git, you might encounter this error when trying to load them in a Windows environment. This happens because a default install of Git for Windows is configured to automatically convert Unix-style end-of-line characters (LF) to Windows-style ones (CRLF) during file checkout (and the reverse when committing). While that's mostly fine for text files, a trained model written to disk has some binary files that should not go through this conversion. When they do, you get the error above. You can fix it by either changing your core.autocrlf setting to "false", or by committing a .gitattributes file to your repository to tell Git on which files or folders it shouldn't do LF-to-CRLF conversion, with an entry like path/to/spacy/model/** -text. After you've done either of these, clone your repository again.

Changelog

import Changelog from 'widgets/changelog.js'