9. Custom Distance Metrics

Estimated time: 12 minutes

Learn how to define and use custom distance metrics in Annie.

Steps

1. Define a custom metric:
2. Subclass or configure as per API.
3. Use with AnnIndex:
4. Pass your metric to the index constructor.

Example

from rust_annie import AnnIndex, Distance
index = AnnIndex(128, Distance.COSINE)

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