spaCy/website/docs/api/vectors.md

title	teaser	tag	source	new
Vectors	Store, save and load word vectors	class	spacy/vectors.pyx	2

Vectors data is kept in the Vectors.data attribute, which should be an instance of numpy.ndarray (for CPU vectors) or cupy.ndarray (for GPU vectors). Multiple keys can be mapped to the same vector, and not all of the rows in the table need to be assigned – so vectors.n_keys may be greater or smaller than vectors.shape[0].

Vectors.__init__

Create a new vector store. You can set the vector values and keys directly on initialization, or supply a shape keyword argument to create an empty table you can add vectors to later.

Example

from spacy.vectors import Vectors

empty_vectors = Vectors(shape=(10000, 300))

data = numpy.zeros((3, 300), dtype='f')
keys = ["cat", "dog", "rat"]
vectors = Vectors(data=data, keys=keys)

Name	Description
keyword-only
shape	Size of the table as (n_entries, n_columns), the number of entries and number of columns. Not required if you're initializing the object with data and keys. Tuple[int, int]
data	The vector data. numpy.ndarray[ndim=1, dtype=float32]
keys	A sequence of keys aligned with the data. Iterable[Union[str, int]]
name	A name to identify the vectors table. str

Vectors.__getitem__

Get a vector by key. If the key is not found in the table, a KeyError is raised.

Example

cat_id = nlp.vocab.strings["cat"]
cat_vector = nlp.vocab.vectors[cat_id]
assert cat_vector == nlp.vocab["cat"].vector

Name	Description
key	The key to get the vector for. int
RETURNS	The vector for the key. numpy.ndarray[ndim=1, dtype=float32]

Vectors.__setitem__

Set a vector for the given key.

Example

cat_id = nlp.vocab.strings["cat"]
vector = numpy.random.uniform(-1, 1, (300,))
nlp.vocab.vectors[cat_id] = vector

Name	Description
key	The key to set the vector for. int
vector	The vector to set. numpy.ndarray[ndim=1, dtype=float32]

Vectors.__iter__

Iterate over the keys in the table.

Example

for key in nlp.vocab.vectors:
   print(key, nlp.vocab.strings[key])

Name	Description
YIELDS	A key in the table. int

Vectors.__len__

Return the number of vectors in the table.

Example

vectors = Vectors(shape=(3, 300))
assert len(vectors) == 3

Name	Description
RETURNS	The number of vectors in the table. int

Vectors.__contains__

Check whether a key has been mapped to a vector entry in the table.

Example

cat_id = nlp.vocab.strings["cat"]
nlp.vocab.vectors.add(cat_id, numpy.random.uniform(-1, 1, (300,)))
assert cat_id in vectors

Name	Description
key	The key to check. int
RETURNS	Whether the key has a vector entry. bool

Vectors.add

Add a key to the table, optionally setting a vector value as well. Keys can be mapped to an existing vector by setting row, or a new vector can be added. When adding string keys, keep in mind that the Vectors class itself has no StringStore, so you have to store the hash-to-string mapping separately. If you need to manage the strings, you should use the Vectors via the Vocab class, e.g. vocab.vectors.

Example

vector = numpy.random.uniform(-1, 1, (300,))
cat_id = nlp.vocab.strings["cat"]
nlp.vocab.vectors.add(cat_id, vector=vector)
nlp.vocab.vectors.add("dog", row=0)

Name	Description
key	The key to add. Union[str, int]
keyword-only
vector	An optional vector to add for the key. numpy.ndarray[ndim=1, dtype=float32]
row	An optional row number of a vector to map the key to. int
RETURNS	The row the vector was added to. int

Vectors.resize

Resize the underlying vectors array. If inplace=True, the memory is reallocated. This may cause other references to the data to become invalid, so only use inplace=True if you're sure that's what you want. If the number of vectors is reduced, keys mapped to rows that have been deleted are removed. These removed items are returned as a list of (key, row) tuples.

Example

removed = nlp.vocab.vectors.resize((10000, 300))

Name	Description
shape	A (rows, dims) tuple describing the number of rows and dimensions. Tuple[int, int]
inplace	Reallocate the memory. bool
RETURNS	The removed items as a list of (key, row) tuples. List[Tuple[int, int]]

Vectors.keys

A sequence of the keys in the table.

Example

for key in nlp.vocab.vectors.keys():
    print(key, nlp.vocab.strings[key])

Name	Description
RETURNS	The keys. Iterable[int]

Vectors.values

Iterate over vectors that have been assigned to at least one key. Note that some vectors may be unassigned, so the number of vectors returned may be less than the length of the vectors table.

Example

for vector in nlp.vocab.vectors.values():
    print(vector)

Name	Description
YIELDS	A vector in the table. numpy.ndarray[ndim=1, dtype=float32]

Vectors.items

Iterate over (key, vector) pairs, in order.

Example

for key, vector in nlp.vocab.vectors.items():
   print(key, nlp.vocab.strings[key], vector)

Name	Description
YIELDS	(key, vector) pairs, in order. Tuple[int, numpy.ndarray[ndim=1, dtype=float32]]

Vectors.find

Look up one or more keys by row, or vice versa.

Example

row = nlp.vocab.vectors.find(key="cat")
rows = nlp.vocab.vectors.find(keys=["cat", "dog"])
key = nlp.vocab.vectors.find(row=256)
keys = nlp.vocab.vectors.find(rows=[18, 256, 985])

Name	Description
keyword-only
key	Find the row that the given key points to. Returns int, -1 if missing. Union[str, int]
keys	Find rows that the keys point to. Returns numpy.ndarray. Iterable[Union[str, int]]
row	Find the first key that points to the row. Returns integer. int
rows	Find the keys that point to the rows. Returns numpy.ndarray. Iterable[int]
RETURNS	The requested key, keys, row or rows. Union[int, numpy.ndarray[ndim=1, dtype=float32]]

Vectors.shape

Get (rows, dims) tuples of number of rows and number of dimensions in the vector table.

Example

vectors = Vectors(shape(1, 300))
vectors.add("cat", numpy.random.uniform(-1, 1, (300,)))
rows, dims = vectors.shape
assert rows == 1
assert dims == 300

Name	Description
RETURNS	A (rows, dims) pair. Tuple[int, int]

Vectors.size

The vector size, i.e. rows * dims.

Example

vectors = Vectors(shape=(500, 300))
assert vectors.size == 150000

Name	Description
RETURNS	The vector size. int

Vectors.is_full

Whether the vectors table is full and has no slots are available for new keys. If a table is full, it can be resized using Vectors.resize.

Example

vectors = Vectors(shape=(1, 300))
vectors.add("cat", numpy.random.uniform(-1, 1, (300,)))
assert vectors.is_full

Name	Description
RETURNS	Whether the vectors table is full. bool

Vectors.n_keys

Get the number of keys in the table. Note that this is the number of all keys, not just unique vectors. If several keys are mapped to the same vectors, they will be counted individually.

Example

vectors = Vectors(shape=(10, 300))
assert len(vectors) == 10
assert vectors.n_keys == 0

Name	Description
RETURNS	The number of all keys in the table. int

Vectors.most_similar

For each of the given vectors, find the n most similar entries to it by cosine. Queries are by vector. Results are returned as a (keys, best_rows, scores) tuple. If queries is large, the calculations are performed in chunks to avoid consuming too much memory. You can set the batch_size to control the size/space trade-off during the calculations.

Example

queries = numpy.asarray([numpy.random.uniform(-1, 1, (300,))])
most_similar = nlp.vocab.vectors.most_similar(queries, n=10)

Name	Description
queries	An array with one or more vectors. numpy.ndarray
keyword-only
batch_size	The batch size to use. Default to 1024. int
n	The number of entries to return for each query. Defaults to 1. int
sort	Whether to sort the entries returned by score. Defaults to True. bool
RETURNS	tuple	The most similar entries as a (keys, best_rows, scores) tuple. Tuple[numpy.ndarray, numpy.ndarray, numpy.ndarray]

Vectors.to_disk

Save the current state to a directory.

Example

vectors.to_disk("/path/to/vectors")

Name	Description
path	A path to a directory, which will be created if it doesn't exist. Paths may be either strings or Path-like objects. Union[str, Path]

Vectors.from_disk

Loads state from a directory. Modifies the object in place and returns it.

Example

vectors = Vectors(StringStore())
vectors.from_disk("/path/to/vectors")

Name	Description
path	A path to a directory. Paths may be either strings or Path-like objects. Union[str, Path]
RETURNS	The modified Vectors object. Vectors

Vectors.to_bytes

Serialize the current state to a binary string.

Example

vectors_bytes = vectors.to_bytes()

Name	Description
RETURNS	The serialized form of the Vectors object. bytes

Vectors.from_bytes

Load state from a binary string.

Example

fron spacy.vectors import Vectors
vectors_bytes = vectors.to_bytes()
new_vectors = Vectors(StringStore())
new_vectors.from_bytes(vectors_bytes)

Name	Description
data	The data to load from. bytes
RETURNS	The Vectors object. Vectors

Attributes

Name	Description
data	Stored vectors data. numpy is used for CPU vectors, cupy for GPU vectors. Union[numpy.ndarray[ndim=1, dtype=float32], cupy.ndarray[ndim=1, dtype=float32]]
key2row	Dictionary mapping word hashes to rows in the Vectors.data table. Dict[int, int]
keys	Array keeping the keys in order, such that keys[vectors.key2row[key]] == key. Union[numpy.ndarray[ndim=1, dtype=float32], cupy.ndarray[ndim=1, dtype=float32]]