多分类模型

多分类模型和CTR模型基本一致，只是num_class > 1。

如下图所示, 和CTR模型相比增加了: num_class: 2

model_config:{
  model_class: "DeepFM"
  feature_groups: {
    group_name: "deep"
    feature_names: "hour"
    feature_names: "c1"
    ...
    feature_names: "site_id_app_id"
    wide_deep:DEEP
  }
  feature_groups: {
    group_name: "wide"
    feature_names: "hour"
    feature_names: "c1"
    ...
    feature_names: "c21"
    wide_deep:WIDE
  }

  deepfm {
    wide_output_dim: 16

    dnn {
      hidden_units: [128, 64, 32]
    }

    final_dnn {
      hidden_units: [128, 64]
    }
    l2_regularization: 1e-5
  }
  embedding_regularization: 1e-7
  num_class: 2
}