mlx-bun library API
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    interface PreprocessedImage {
        patches: Float32Array;
        positions: Int32Array;
        softTokens: number;
    }
    Index
    patches: Float32Array

    [numSoftTokens, 6912] f32 patch vectors (padded).

    positions: Int32Array

    [numSoftTokens, 2] (x, y) grid positions; -1 padding.

    softTokens: number

    Real (unpadded) soft-token count.