spaCy/website/docs/api/lexeme.md

title	teaser	tag	source
Lexeme	An entry in the vocabulary	class	spacy/lexeme.pyx

A Lexeme has no string context – it's a word type, as opposed to a word token. It therefore has no part-of-speech tag, dependency parse, or lemma (if lemmatization depends on the part-of-speech tag).

Lexeme.__init__

Create a Lexeme object.

Name	Description
vocab	The parent vocabulary. Vocab
orth	The orth id of the lexeme. int

Lexeme.set_flag

Change the value of a boolean flag.

Example

COOL_FLAG = nlp.vocab.add_flag(lambda text: False)
nlp.vocab["spaCy"].set_flag(COOL_FLAG, True)

Name	Description
flag_id	The attribute ID of the flag to set. int
value	The new value of the flag. bool

Lexeme.check_flag

Check the value of a boolean flag.

Example

is_my_library = lambda text: text in ["spaCy", "Thinc"]
MY_LIBRARY = nlp.vocab.add_flag(is_my_library)
assert nlp.vocab["spaCy"].check_flag(MY_LIBRARY) == True

Name	Description
flag_id	The attribute ID of the flag to query. int
RETURNS	The value of the flag. bool

Lexeme.similarity

Compute a semantic similarity estimate. Defaults to cosine over vectors.

Example

apple = nlp.vocab["apple"]
orange = nlp.vocab["orange"]
apple_orange = apple.similarity(orange)
orange_apple = orange.similarity(apple)
assert apple_orange == orange_apple

Name	Description
other	The object to compare with. By default, accepts Doc, Span, Token and Lexeme objects. Union[Doc, Span, Token, Lexeme]
RETURNS	A scalar similarity score. Higher is more similar. float

Lexeme.has_vector

A boolean value indicating whether a word vector is associated with the lexeme.

Example

apple = nlp.vocab["apple"]
assert apple.has_vector

Name	Description
RETURNS	Whether the lexeme has a vector data attached. bool

Lexeme.vector

A real-valued meaning representation.

Example

apple = nlp.vocab["apple"]
assert apple.vector.dtype == "float32"
assert apple.vector.shape == (300,)

Name	Description
RETURNS	A 1-dimensional array representing the lexeme's vector. numpy.ndarray[ndim=1, dtype=float32]

Lexeme.vector_norm

The L2 norm of the lexeme's vector representation.

Example

apple = nlp.vocab["apple"]
pasta = nlp.vocab["pasta"]
apple.vector_norm  # 7.1346845626831055
pasta.vector_norm  # 7.759851932525635
assert apple.vector_norm != pasta.vector_norm

Name	Description
RETURNS	The L2 norm of the vector representation. float

Attributes

Name	Description
vocab	The lexeme's vocabulary. Vocab
text	Verbatim text content. str
orth	ID of the verbatim text content. int
orth_	Verbatim text content (identical to Lexeme.text). Exists mostly for consistency with the other attributes. str
rank	Sequential ID of the lexeme's lexical type, used to index into tables, e.g. for word vectors. int
flags	Container of the lexeme's binary flags. int
norm	The lexeme's norm, i.e. a normalized form of the lexeme text. int
norm_	The lexeme's norm, i.e. a normalized form of the lexeme text. str
lower	Lowercase form of the word. int
lower_	Lowercase form of the word. str
shape	Transform of the word's string, to show orthographic features. Alphabetic characters are replaced by x or X, and numeric characters are replaced by d, and sequences of the same character are truncated after length 4. For example,"Xxxx"or"dd". int
shape_	Transform of the word's string, to show orthographic features. Alphabetic characters are replaced by x or X, and numeric characters are replaced by d, and sequences of the same character are truncated after length 4. For example,"Xxxx"or"dd". str
prefix	Length-N substring from the start of the word. Defaults to N=1. int
prefix_	Length-N substring from the start of the word. Defaults to N=1. str
suffix	Length-N substring from the end of the word. Defaults to N=3. int
suffix_	Length-N substring from the start of the word. Defaults to N=3. str
is_alpha	Does the lexeme consist of alphabetic characters? Equivalent to lexeme.text.isalpha(). bool
is_ascii	Does the lexeme consist of ASCII characters? Equivalent to [any(ord(c) >= 128 for c in lexeme.text)]. bool
is_digit	Does the lexeme consist of digits? Equivalent to lexeme.text.isdigit(). bool
is_lower	Is the lexeme in lowercase? Equivalent to lexeme.text.islower(). bool
is_upper	Is the lexeme in uppercase? Equivalent to lexeme.text.isupper(). bool
is_title	Is the lexeme in titlecase? Equivalent to lexeme.text.istitle(). bool
is_punct	Is the lexeme punctuation? bool
is_left_punct	Is the lexeme a left punctuation mark, e.g. (? bool
is_right_punct	Is the lexeme a right punctuation mark, e.g. )? bool
is_space	Does the lexeme consist of whitespace characters? Equivalent to lexeme.text.isspace(). bool
is_bracket	Is the lexeme a bracket? bool
is_quote	Is the lexeme a quotation mark? bool
is_currency	Is the lexeme a currency symbol? bool
like_url	Does the lexeme resemble a URL? bool
like_num	Does the lexeme represent a number? e.g. "10.9", "10", "ten", etc. bool
like_email	Does the lexeme resemble an email address? bool
is_oov	Is the lexeme out-of-vocabulary (i.e. does it not have a word vector)? bool
is_stop	Is the lexeme part of a "stop list"? bool
lang	Language of the parent vocabulary. int
lang_	Language of the parent vocabulary. str
prob	Smoothed log probability estimate of the lexeme's word type (context-independent entry in the vocabulary). float
cluster	Brown cluster ID. int
sentiment	A scalar value indicating the positivity or negativity of the lexeme. float