Firestore in Datastore mode V1 API - Module Google::Cloud::Datastore::V1::FindNearest::DistanceMeasure (v1.2.0)

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Reference documentation and code samples for the Firestore in Datastore mode V1 API module Google::Cloud::Datastore::V1::FindNearest::DistanceMeasure.

The distance measure to use when comparing vectors.

Constants

DISTANCE_MEASURE_UNSPECIFIED

value: 0
Should not be set.

EUCLIDEAN

value: 1
Measures the EUCLIDEAN distance between the vectors. See Euclidean to learn more. The resulting distance decreases the more similar two vectors are.

COSINE

value: 2
COSINE distance compares vectors based on the angle between them, which allows you to measure similarity that isn't based on the vectors magnitude. We recommend using DOT_PRODUCT with unit normalized vectors instead of COSINE distance, which is mathematically equivalent with better performance. See Cosine Similarity to learn more about COSINE similarity and COSINE distance. The resulting COSINE distance decreases the more similar two vectors are.

DOT_PRODUCT

value: 3
Similar to cosine but is affected by the magnitude of the vectors. See Dot Product to learn more. The resulting distance increases the more similar two vectors are.