weavatrix-search-vector 0.3.1

Persistent, mutable, bounded vector candidate search for Rust and Weavatrix
Documentation 
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use super::format::{decode_u16s, decode_u64s, take};
use crate::error::SearchError;
use crate::quantized::{QuantizationKind, QuantizedStorage};

impl QuantizedStorage {
    pub(super) fn byte_len(&self) -> Option<usize> {
        match self {
            Self::BFloat16(values) | Self::Float16(values) => values.len().checked_mul(2),
            Self::Float8E4M3(values) => Some(values.len()),
            Self::Int8(values) => Some(values.len()),
            Self::Binary(values) => values.len().checked_mul(8),
        }
    }

    pub(super) fn encode_into(&self, bytes: &mut Vec<u8>) {
        match self {
            Self::BFloat16(values) | Self::Float16(values) => {
                for value in values {
                    bytes.extend_from_slice(&value.to_le_bytes());
                }
            }
            Self::Float8E4M3(values) => bytes.extend_from_slice(values),
            Self::Int8(values) => bytes.extend(values.iter().map(|value| value.to_le_bytes()[0])),
            Self::Binary(values) => {
                for value in values {
                    bytes.extend_from_slice(&value.to_le_bytes());
                }
            }
        }
    }
}

pub(super) fn decode_storage(
    kind: QuantizationKind,
    bytes: &[u8],
    cursor: &mut usize,
    length: usize,
) -> Result<QuantizedStorage, SearchError> {
    Ok(match kind {
        QuantizationKind::BFloat16 | QuantizationKind::Float16 => {
            let values = decode_u16s(bytes, cursor, length)?;
            if kind == QuantizationKind::BFloat16 {
                QuantizedStorage::BFloat16(values)
            } else {
                QuantizedStorage::Float16(values)
            }
        }
        QuantizationKind::Float8E4M3 => {
            QuantizedStorage::Float8E4M3(take(bytes, cursor, length)?.to_vec())
        }
        QuantizationKind::Int8 => QuantizedStorage::Int8(
            take(bytes, cursor, length)?
                .iter()
                .map(|value| i8::from_le_bytes([*value]))
                .collect(),
        ),
        QuantizationKind::Binary => QuantizedStorage::Binary(decode_u64s(bytes, cursor, length)?),
    })
}