Rankextor is a set of algorithm execution engines based on C/C++. It is mainly used for algorithm serving in the fields of recommendation, advertising, and search. It supports embedding into Java/Scala service processes or providing RPC ranking services as an independent process.

1. Flexible and efficient "graph" execution engine.

2. Convenient feature, strategy, model, and feature engineering support.

   • Features such as:
     • Basic user portrait characteristics
     • Statistical feedback CTR features
     • Material side characteristics
   • Click-through rate estimation algorithm is as follows:
     • LR
     • FM
     • GBDT+LR
     • Deep Learning (Pytorch)
   • Feature engineering processing such as:
     • Equal frequency, equal distance scattering
     • Bucket
     • Feature crossover
     • Multiple feature support
     • Sample sampling
     • hash discrete
   • Strategies such as:
     • Scoring and ranking
     • Sort and adjust
     • Material filtration

3. Embed Java services, or provide RPC services as independent processes

4. Dynamic loading of model files and configuration files

cmake ..
make

For pytorch model training and serving part, check the pytorch_ranking

The following configuration defines what kind of features we need, and what models shall take charge and what kind of rank strategies are needed.

name: "model"
condition {
    name:"bidfeed"
}
condition {
    name:"cpm"
}
condition {
    name:"cpc"
}
condition {
    name:"ocpm"
}
feature {
    name: "request_feature"
    data: { key: "redis_user_schema" value: "redis_user_schema.txt" }
    group: "begin"
}
extractor {
    name: "xfea1"
    type: "xfea"
    bottom: "begin"
    top: "ctcvr_fea"
    config: "suning_features.conf"
}
model {
    name: "gds_ctcvr1"
    type: "fm"
    bottom: "ctcvr_fea"
    top: "ctcvr"
    role: PREDICTOR
    model_file: "fm.model"
} 
strategy {
    name: "reset"
    order: -20
}
strategy {
    name: "calibrate"
    order: 1
    ids: "1"
    desc: "cut"
}
strategy {
    name: "ocpx"
    order: 2
}
strategy {
    name: "rankscore"
    order: 3
}
strategy {
    name: "sort"
    order: 4
}