TF-IDF Estimator

[ogui11aume]

Dear RubixML Team,

I have a simple use case where RubixML can help me achieve 90% of the hardwork, put I'm missing a final result Class.
I would like to have your advice on how to best design / architect the code to keep it RubixML friendly.

RubixML already as all the necessary utility classes : Transformers\TfIdfTransformer, Kernel/Distance/Cosine and other useful tools to preprocess.

I think that what I'm missing is an Estimator Class that can output the result of the TfIdfTransformer.

I have created a new TF-IDF similarity ranking Estimator Class

class TfIdfRankerEstimator implements Estimator, Verbose, Persistable
{
    use AutotrackRevisions, LoggerAware;

    private $logger;
     /**
     * The distance kernel to use when computing the distances between samples.
     *
     * @var \Rubix\ML\Kernels\Distance\Distance
     */
    protected \Rubix\ML\Kernels\Distance\Distance $kernel;

    // Number of ranks results to return as int
    protected int $numberRankedResults;

Am I on the right path ?

Regards
Guillaume