HnswParameters Class

  • Reference

Contains the parameters specific to the HNSW algorithm.

Inheritance
azure.search.documents.indexes._generated._serialization.Model
HnswParameters

Constructor

HnswParameters(*, m: int = 4, ef_construction: int = 400, ef_search: int = 500, metric: str | _models.VectorSearchAlgorithmMetric | None = None, **kwargs: Any)

Keyword-Only Parameters

Name Description
m
int

The number of bi-directional links created for every new element during construction. Increasing this parameter value may improve recall and reduce retrieval times for datasets with high intrinsic dimensionality at the expense of increased memory consumption and longer indexing time.

Default value: 4
ef_construction
int

The size of the dynamic list containing the nearest neighbors, which is used during index time. Increasing this parameter may improve index quality, at the expense of increased indexing time. At a certain point, increasing this parameter leads to diminishing returns.

Default value: 400
ef_search
int

The size of the dynamic list containing the nearest neighbors, which is used during search time. Increasing this parameter may improve search results, at the expense of slower search. At a certain point, increasing this parameter leads to diminishing returns.

Default value: 500
metric
str or VectorSearchAlgorithmMetric

The similarity metric to use for vector comparisons. Known values are: "cosine", "euclidean", "dotProduct", and "hamming".

Variables

Name Description
m
int

The number of bi-directional links created for every new element during construction. Increasing this parameter value may improve recall and reduce retrieval times for datasets with high intrinsic dimensionality at the expense of increased memory consumption and longer indexing time.
ef_construction
int

The size of the dynamic list containing the nearest neighbors, which is used during index time. Increasing this parameter may improve index quality, at the expense of increased indexing time. At a certain point, increasing this parameter leads to diminishing returns.
ef_search
int

The size of the dynamic list containing the nearest neighbors, which is used during search time. Increasing this parameter may improve search results, at the expense of slower search. At a certain point, increasing this parameter leads to diminishing returns.
metric
str or VectorSearchAlgorithmMetric

The similarity metric to use for vector comparisons. Known values are: "cosine", "euclidean", "dotProduct", and "hamming".

Methods

as_dict

Return a dict that can be serialized using json.dump.

Advanced usage might optionally use a callback as parameter:

Key is the attribute name used in Python. Attr_desc is a dict of metadata. Currently contains 'type' with the msrest type and 'key' with the RestAPI encoded key. Value is the current value in this object.

The string returned will be used to serialize the key. If the return type is a list, this is considered hierarchical result dict.

See the three examples in this file:

  • attribute_transformer

  • full_restapi_key_transformer

  • last_restapi_key_transformer

If you want XML serialization, you can pass the kwargs is_xml=True.
deserialize

Parse a str using the RestAPI syntax and return a model.
enable_additional_properties_sending
from_dict

Parse a dict using given key extractor return a model.

By default consider key extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor and last_rest_key_case_insensitive_extractor)
is_xml_model
serialize

Return the JSON that would be sent to server from this model.

This is an alias to as_dict(full_restapi_key_transformer, keep_readonly=False).

If you want XML serialization, you can pass the kwargs is_xml=True.

as_dict

Return a dict that can be serialized using json.dump.

Advanced usage might optionally use a callback as parameter:

Key is the attribute name used in Python. Attr_desc is a dict of metadata. Currently contains 'type' with the msrest type and 'key' with the RestAPI encoded key. Value is the current value in this object.

The string returned will be used to serialize the key. If the return type is a list, this is considered hierarchical result dict.

See the three examples in this file:

  • attribute_transformer

  • full_restapi_key_transformer

  • last_restapi_key_transformer

If you want XML serialization, you can pass the kwargs is_xml=True.

as_dict(keep_readonly: bool = True, key_transformer: ~typing.Callable[[str, ~typing.Dict[str, ~typing.Any], ~typing.Any], ~typing.Any] = <function attribute_transformer>, **kwargs: ~typing.Any) -> MutableMapping[str, Any]

Parameters

Name Description
key_transformer
<xref:function>

A key transformer function.
keep_readonly
Default value: True

Returns

Type Description
dict

A dict JSON compatible object

deserialize

Parse a str using the RestAPI syntax and return a model.

deserialize(data: Any, content_type: str | None = None) -> ModelType

Parameters

Name Description
data
Required
str

A str using RestAPI structure. JSON by default.
content_type
str

JSON by default, set application/xml if XML.

Default value: None

Returns

Type Description

An instance of this model

Exceptions

Type Description
DeserializationError if something went wrong

enable_additional_properties_sending 

enable_additional_properties_sending() -> None

from_dict

Parse a dict using given key extractor return a model.

By default consider key extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor and last_rest_key_case_insensitive_extractor)

from_dict(data: Any, key_extractors: Callable[[str, Dict[str, Any], Any], Any] | None = None, content_type: str | None = None) -> ModelType

Parameters

Name Description
data
Required
dict

A dict using RestAPI structure
content_type
str

JSON by default, set application/xml if XML.

Default value: None
key_extractors
Default value: None

Returns

Type Description

An instance of this model

Exceptions

Type Description
DeserializationError if something went wrong

is_xml_model 

is_xml_model() -> bool

serialize

Return the JSON that would be sent to server from this model.

This is an alias to as_dict(full_restapi_key_transformer, keep_readonly=False).

If you want XML serialization, you can pass the kwargs is_xml=True.

serialize(keep_readonly: bool = False, **kwargs: Any) -> MutableMapping[str, Any]

Parameters

Name Description
keep_readonly
bool

If you want to serialize the readonly attributes

Default value: False

Returns

Type Description
dict

A dict JSON compatible object