This package includes outdated registered functions for spaCy v3.x, for example model architectures, pipeline components and utilities. It's installed automatically as a dependency of spaCy, and allows us to provide backwards compatibility, while keeping the core library tidy and up to date. All of this happens under the hood, so you typically shouldn't have to care about this package.
Whenever a new backwards-incompatible version of a registered function is
available, e.g. spacy.Tok2Vec.v1 → spacy.Tok2Vec.v2, the legacy version
is moved to spacy-legacy, and exposed via entry points. This
means that it will still be available if your config files use it, even though
the core library only includes the latest version.
Legacy functions are exposed with the prefix spacy-legacy, e.g.
spacy-legacy.Tok2Vec.v1. When spaCy resolves your config and a function is not
available in the core library, e.g. spacy.Tok2Vec.v1, it will check if there's
a legacy function available and fall back to that. You can also explicitly refer
to legacy functions in your config, to indicate that a newer version is
available.
Please use spaCy's issue tracker to report a bug, or open a new thread on the discussion board for any other issue.