Storing [MLMultiArray] in Realm?

For context, I am making a face recognition model that will take 120 images of the student/user and converts them into MLMultiArray which is a Float32 1 x 120 matrix. The problem I am facing is that I cant store/persist 120 MLMultiArray in Realm as it does not conform to protocol 'RealmCollectionValue'

For reference, This is the student object that I want to store in Realm.

    class Student: Object {
        @objc dynamic var regNo : String = ""
        @objc dynamic var faceMatrix = List<MLMultiArray>()
    }

I have to store this matrix in Realm and then use it later to recognize faces by taking checking the distance between the new matrix and the one stored in Realm.

Each MLMultiArray generated by the model will look like this.

Float32 1 x 128 matrix
 [4.476562,1.179688,0.07141113,6.976562,-0.2858887,-7.378906,0.6445312,3.695312,1.399414,2.486328,-3.988281,-0.2636719,1.000977,-4.480469,-7.832031,1.59082,0.8515625,-1.296875,-1.435547,7.839844,5.851562,0.3701172,-2.492188,7.273438,2.404297,-3.3125,-5.699219,-0.6816406,0.2807617,-3.882812,-3.982422,5.339844,4.125,-3.871094,0.6225586,1.712891,-10.02344,0.7119141,4.472656,3.566406,-0.559082,-1.049805,-4.679688,10.07812,-1.459961,4.707031,-6.078125,1.675781,-0.6259766,2.519531,3.472656,-3.400391,-6.714844,-4.933594,-1.733398,1.095703,-6.15625,9.234375,3.693359,-9.492188,0.8637695,0.8203125,-2.814453,-4.4375,-1.092773,3.332031,0.1623535,3.583984,-11.25781,-0.9941406,-0.3491211,1.464844,-1.579102,4.558594,2.703125,4.601562,5.914062,-2.402344,-5.46875,-0.355957,11.39062,2.070312,-7.289062,-0.4470215,-0.1595459,9.148438,1.833008,-2.097656,-3.9375,6.699219,-4.347656,-6.835938,-1.179688,3.910156,-13.07812,-1.947266,-0.9238281,-0.949707,-4.398438,2.363281,4.421875,4.632812,2.607422,8.773438,0.9106445,9.21875,-14.0625,-1.301758,-4.875,0.6054688,6.496094,-2.021484,3.898438,-4.644531,0.9853516,7.253906,3.066406,-1.051758,-8.09375,-6.527344,3.890625,5.175781,0.3701172,-0.5683594,-1.341797,0.1497803,4.074219,0.5932617]

Any help would be appreciated <3

Solution

You can store an Array of Primitives in Realm, and reconstruct your MLMultiArray from them.

class Student: Object {
    @objc dynamic var regNo : String = ""
    let faceMatrixValues = List<Float>()

    // Computed property
    var faceMatrix: MLMultiArray {
        try! MLMultiArray(faceMatrixValues.map { $0 })
    }
}