Source code for deepctr.estimator.models.fnn

# -*- coding:utf-8 -*-
    Weichen Shen,

    [1] Zhang W, Du T, Wang J. Deep learning over multi-field categorical data[C]//European conference on information retrieval. Springer, Cham, 2016: 45-57.(
import tensorflow as tf

from ..feature_column import get_linear_logit, input_from_feature_columns
from ..utils import deepctr_model_fn, DNN_SCOPE_NAME, variable_scope
from ...layers.core import DNN
from ...layers.utils import combined_dnn_input

[docs]def FNNEstimator(linear_feature_columns, dnn_feature_columns, dnn_hidden_units=(128, 128), l2_reg_embedding=1e-5, l2_reg_linear=1e-5, l2_reg_dnn=0, seed=1024, dnn_dropout=0, dnn_activation='relu', task='binary', model_dir=None, config=None, linear_optimizer='Ftrl', dnn_optimizer='Adagrad', training_chief_hooks=None): """Instantiates the Factorization-supported Neural Network architecture. :param linear_feature_columns: An iterable containing all the features used by linear part of the model. :param dnn_feature_columns: An iterable containing all the features used by deep part of the model. :param dnn_hidden_units: list,list of positive integer or empty list, the layer number and units in each layer of deep net :param l2_reg_embedding: float. L2 regularizer strength applied to embedding vector :param l2_reg_linear: float. L2 regularizer strength applied to linear weight :param l2_reg_dnn: float . L2 regularizer strength applied to DNN :param seed: integer ,to use as random seed. :param dnn_dropout: float in [0,1), the probability we will drop out a given DNN coordinate. :param dnn_activation: Activation function to use in DNN :param task: str, ``"binary"`` for binary logloss or ``"regression"`` for regression loss :param model_dir: Directory to save model parameters, graph and etc. This can also be used to load checkpoints from the directory into a estimator to continue training a previously saved model. :param config: tf.RunConfig object to configure the runtime settings. :param linear_optimizer: An instance of `tf.Optimizer` used to apply gradients to the linear part of the model. Defaults to FTRL optimizer. :param dnn_optimizer: An instance of `tf.Optimizer` used to apply gradients to the deep part of the model. Defaults to Adagrad optimizer. :param training_chief_hooks: Iterable of `tf.train.SessionRunHook` objects to run on the chief worker during training. :return: A Tensorflow Estimator instance. """ def _model_fn(features, labels, mode, config): train_flag = (mode == tf.estimator.ModeKeys.TRAIN) linear_logits = get_linear_logit(features, linear_feature_columns, l2_reg_linear=l2_reg_linear) with variable_scope(DNN_SCOPE_NAME): sparse_embedding_list, dense_value_list = input_from_feature_columns(features, dnn_feature_columns, l2_reg_embedding=l2_reg_embedding) dnn_input = combined_dnn_input(sparse_embedding_list, dense_value_list) deep_out = DNN(dnn_hidden_units, dnn_activation, l2_reg_dnn, dnn_dropout, False, seed=seed)(dnn_input, training=train_flag) dnn_logit = tf.keras.layers.Dense( 1, use_bias=False, kernel_initializer=tf.keras.initializers.glorot_normal(seed))(deep_out) logits = linear_logits + dnn_logit return deepctr_model_fn(features, mode, logits, labels, task, linear_optimizer, dnn_optimizer, training_chief_hooks=training_chief_hooks) return tf.estimator.Estimator(_model_fn, model_dir=model_dir, config=config)