def DeepFM2(linear_feature_columns, dnn_feature_columns, fm_group=[DEFAULT_GROUP_NAME], dnn_hidden_units=(128, 128),
l2_reg_linear=0.00001, l2_reg_embedding=0.00001, l2_reg_dnn=0, seed=1024, dnn_dropout=0,
dnn_activation='relu', dnn_use_bn=False, task='binary', use_attention=True, attention_factor=8,
l2_reg_att=1e-5, afm_dropout=0):
"""Instantiates the DeepFM Network architecture.
:param afm_dropout:
:param l2_reg_att:
:param attention_factor:
:param use_attention:
: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 fm_group: list, group_name of features that will be used to do feature interactions.
:param dnn_hidden_units: list,list of positive integer or empty list, the layer number and units in each layer of DNN
:param l2_reg_linear: float. L2 regularizer strength applied to linear part
:param l2_reg_embedding: float. L2 regularizer strength applied to embedding vector
: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 dnn_use_bn: bool. Whether use BatchNormalization before activation or not in DNN
:param task: str, ``"binary"`` for binary logloss or ``"regression"`` for regression loss
:return: A Keras model instance.
"""
features = build_input_features(
linear_feature_columns + dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features, linear_feature_columns, seed=seed, prefix='linear',
l2_reg=l2_reg_linear)
group_embedding_dict, dense_value_list = input_from_feature_columns(features, dnn_feature_columns, l2_reg_embedding,
seed, support_group=True)
if use_attention:
fm_logit = add_func([AFMLayer(attention_factor, l2_reg_att, afm_dropout,
seed)(list(v)) for k, v in group_embedding_dict.items() if k in fm_group])
else:
fm_logit = add_func([FM()(concat_func(v, axis=1))
for k, v in group_embedding_dict.items() if k in fm_group])
# fm_logit = add_func([FM()(concat_func(v, axis=1))
# for k, v in group_embedding_dict.items() if k in fm_group])
dnn_input = combined_dnn_input(list(chain.from_iterable(
group_embedding_dict.values())), dense_value_list)
dnn_output = DNN(dnn_hidden_units, dnn_activation, l2_reg_dnn, dnn_dropout, dnn_use_bn, seed=seed)(dnn_input)
dnn_logit = tf.keras.layers.Dense(
1, use_bias=False, kernel_initializer=tf.keras.initializers.glorot_normal(seed=seed))(dnn_output)
final_logit = add_func([linear_logit, fm_logit, dnn_logit])
output = PredictionLayer(task)(final_logit)
model = tf.keras.models.Model(inputs=inputs_list, outputs=output)
return model
def M(emb1,
emb1_label,
emb2,
emb2_label,
emb3,
emb3_label,
emb4,
emb4_label,
emb5,
emb5_label,
linear_feature_columns,
dnn_feature_columns,
fm_group=[DEFAULT_GROUP_NAME],
dnn_hidden_units=(128, 128),
l2_reg_linear=0.00001,
l2_reg_embedding=0.00001,
l2_reg_dnn=0,
seed=1024,
dnn_dropout=0,
dnn_activation='relu',
dnn_use_bn=False,
task='binary'):
#!################################################################################################################
feed_forward_size_trans_1 = 2048
max_seq_len_trans_1 = 40
model_dim_trans_1 = 128
input_trans_1 = Input(shape=(max_seq_len_trans_1, ),
name='input_trans_1_layer')
input_trans_1_label = Input(shape=(max_seq_len_trans_1, ),
name='input_trans_1_label_layer')
x = Embedding(input_dim=5307 + 1,
output_dim=128,
weights=[emb1],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_1)
x_label = Embedding(input_dim=2 + 1,
output_dim=128,
weights=[emb1_label],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_1_label)
encodings = PositionEncoding(model_dim_trans_1)(x)
encodings = Add()([x, encodings])
encodings = Add()([x_label, encodings])
# encodings = x
masks = tf.equal(input_trans_1, 0)
# (bs, 100, 128*2)
attention_out = MultiHeadAttention(
4, 32)([encodings, encodings, encodings, masks])
# Add & Norm
attention_out += encodings
attention_out = LayerNormalization()(attention_out)
# Feed-Forward
ff = PositionWiseFeedForward(model_dim_trans_1, feed_forward_size_trans_1)
ff_out = ff(attention_out)
# Add & Norm
ff_out += attention_out
encodings = LayerNormalization()(ff_out)
encodings = GlobalMaxPooling1D()(encodings)
encodings = Dropout(0.2)(encodings)
output_trans_1 = Dense(5,
activation='softmax',
name='output_trans_1_layer')(encodings)
#!################################################################################################################
feed_forward_size_trans_2 = 2048
max_seq_len_trans_2 = 40
model_dim_trans_2 = 128
input_trans_2 = Input(shape=(max_seq_len_trans_2, ),
name='input_trans_2_layer')
input_trans_2_label = Input(shape=(max_seq_len_trans_2, ),
name='input_trans_2_label_layer')
x = Embedding(input_dim=101 + 1,
output_dim=128,
weights=[emb2],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_2)
x_label = Embedding(input_dim=2 + 1,
output_dim=128,
weights=[emb2_label],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_2_label)
encodings = PositionEncoding(model_dim_trans_2)(x)
encodings = Add()([x, encodings])
encodings = Add()([x_label, encodings])
# encodings = x
masks = tf.equal(input_trans_2, 0)
# (bs, 100, 128*2)
attention_out = MultiHeadAttention(
4, 32)([encodings, encodings, encodings, masks])
# Add & Norm
attention_out += encodings
attention_out = LayerNormalization()(attention_out)
# Feed-Forward
ff = PositionWiseFeedForward(model_dim_trans_2, feed_forward_size_trans_2)
ff_out = ff(attention_out)
# Add & Norm
ff_out += attention_out
encodings = LayerNormalization()(ff_out)
encodings = GlobalMaxPooling1D()(encodings)
encodings = Dropout(0.2)(encodings)
output_trans_2 = Dense(5,
activation='softmax',
name='output_trans_2_layer')(encodings)
#!################################################################################################################
feed_forward_size_trans_3 = 2048
max_seq_len_trans_3 = 40
model_dim_trans_3 = 128
input_trans_3 = Input(shape=(max_seq_len_trans_3, ),
name='input_trans_3_layer')
input_trans_3_label = Input(shape=(max_seq_len_trans_3, ),
name='input_trans_3_label_layer')
x = Embedding(input_dim=8 + 1,
output_dim=128,
weights=[emb3],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_3)
x_label = Embedding(input_dim=2 + 1,
output_dim=128,
weights=[emb3_label],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_3_label)
encodings = PositionEncoding(model_dim_trans_3)(x)
encodings = Add()([x, encodings])
encodings = Add()([x_label, encodings])
# encodings = x
masks = tf.equal(input_trans_3, 0)
# (bs, 100, 128*2)
attention_out = MultiHeadAttention(
4, 32)([encodings, encodings, encodings, masks])
# Add & Norm
attention_out += encodings
attention_out = LayerNormalization()(attention_out)
# Feed-Forward
ff = PositionWiseFeedForward(model_dim_trans_3, feed_forward_size_trans_3)
ff_out = ff(attention_out)
# Add & Norm
ff_out += attention_out
encodings = LayerNormalization()(ff_out)
encodings = GlobalMaxPooling1D()(encodings)
encodings = Dropout(0.2)(encodings)
output_trans_3 = Dense(5,
activation='softmax',
name='output_trans_3_layer')(encodings)
#!################################################################################################################
feed_forward_size_trans_4 = 2048
max_seq_len_trans_4 = 40
model_dim_trans_4 = 128
input_trans_4 = Input(shape=(max_seq_len_trans_4, ),
name='input_trans_4_layer')
input_trans_4_label = Input(shape=(max_seq_len_trans_4, ),
name='input_trans_4_label_layer')
x = Embedding(input_dim=38 + 1,
output_dim=128,
weights=[emb4],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_4)
x_label = Embedding(input_dim=2 + 1,
output_dim=128,
weights=[emb4_label],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_4_label)
encodings = PositionEncoding(model_dim_trans_4)(x)
encodings = Add()([x, encodings])
encodings = Add()([x_label, encodings])
# encodings = x
masks = tf.equal(input_trans_4, 0)
# (bs, 100, 128*2)
attention_out = MultiHeadAttention(
4, 32)([encodings, encodings, encodings, masks])
# Add & Norm
attention_out += encodings
attention_out = LayerNormalization()(attention_out)
# Feed-Forward
ff = PositionWiseFeedForward(model_dim_trans_4, feed_forward_size_trans_4)
ff_out = ff(attention_out)
# Add & Norm
ff_out += attention_out
encodings = LayerNormalization()(ff_out)
encodings = GlobalMaxPooling1D()(encodings)
encodings = Dropout(0.2)(encodings)
output_trans_4 = Dense(5,
activation='softmax',
name='output_trans_4_layer')(encodings)
#!################################################################################################################
feed_forward_size_trans_5 = 2048
max_seq_len_trans_5 = 40
model_dim_trans_5 = 128
input_trans_5 = Input(shape=(max_seq_len_trans_5, ),
name='input_trans_5_layer')
input_trans_5_label = Input(shape=(max_seq_len_trans_5, ),
name='input_trans_5_label_layer')
x = Embedding(input_dim=4317 + 1,
output_dim=128,
weights=[emb5],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_5)
x_label = Embedding(input_dim=2 + 1,
output_dim=128,
weights=[emb5_label],
trainable=False,
input_length=40,
mask_zero=True)(input_trans_5_label)
encodings = PositionEncoding(model_dim_trans_5)(x)
encodings = Add()([x, encodings])
encodings = Add()([x_label, encodings])
# encodings = x
masks = tf.equal(input_trans_5, 0)
# (bs, 100, 128*2)
attention_out = MultiHeadAttention(
4, 32)([encodings, encodings, encodings, masks])
# Add & Norm
attention_out += encodings
attention_out = LayerNormalization()(attention_out)
# Feed-Forward
ff = PositionWiseFeedForward(model_dim_trans_5, feed_forward_size_trans_5)
ff_out = ff(attention_out)
# Add & Norm
ff_out += attention_out
encodings = LayerNormalization()(ff_out)
encodings = GlobalMaxPooling1D()(encodings)
encodings = Dropout(0.2)(encodings)
output_trans_5 = Dense(5,
activation='softmax',
name='output_trans_5_layer')(encodings)
#!################################################################################################################
trans_output = concatenate([output_trans_1, output_trans_2], axis=-1)
trans_output = concatenate([trans_output, output_trans_3], axis=-1)
trans_output = concatenate([trans_output, output_trans_4], axis=-1)
trans_output = concatenate([trans_output, output_trans_5], axis=-1)
# trans_output = Dense(2, activation='softmax', name='output_trans')(trans_output)
#!################################################################################################################
#!mix2
features = build_input_features(linear_feature_columns +
dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features,
linear_feature_columns,
seed=seed,
prefix='linear',
l2_reg=l2_reg_linear)
group_embedding_dict, dense_value_list = input_from_feature_columns(
features,
dnn_feature_columns,
l2_reg_embedding,
seed,
support_group=True)
fm_logit = add_func([
FM()(concat_func(v, axis=1)) for k, v in group_embedding_dict.items()
if k in fm_group
])
dnn_input = combined_dnn_input(
list(chain.from_iterable(group_embedding_dict.values())),
dense_value_list)
mix = concatenate([trans_output, dnn_input], axis=-1) #!#mix
dnn_output = DNN(dnn_hidden_units, dnn_activation, l2_reg_dnn, dnn_dropout,
dnn_use_bn, seed)(mix)
dnn_logit = tf.keras.layers.Dense(1, use_bias=False,
activation=None)(dnn_output)
final_logit = add_func([linear_logit, fm_logit, dnn_logit])
output = PredictionLayer(task)(final_logit)
#!################################################################################################################
model = Model(inputs=[
input_trans_1, input_trans_1_label, input_trans_2, input_trans_2_label,
input_trans_3, input_trans_3_label, input_trans_4, input_trans_4_label,
input_trans_5, input_trans_5_label, features
],
outputs=[output])
model.compile(optimizer=optimizers.Adam(2.5e-4),
loss={'prediction_layer': losses.binary_crossentropy},
metrics=['AUC'])
return model
def create_model(linear_feature_columns,
dnn_feature_columns,
fm_group=[DEFAULT_GROUP_NAME],
dnn_hidden_units=(128, 128),
l2_reg_linear=0.00001,
l2_reg_embedding=0.00001,
l2_reg_dnn=0,
seed=1024,
dnn_dropout=0,
dnn_activation='relu',
dnn_use_bn=False,
task='binary'):
K.clear_session()
#!################################################################################################################
inputs_all = [
get_input_feature_layer(name='slotid_nettype',
feature_shape=dense_feature_size)
]
# slotid_nettype
layer_slotid_nettype = inputs_all[0]
layer_slotid_nettype = K.expand_dims(layer_slotid_nettype, 1)
#!################################################################################################################
# seq_inputs_dict = get_cross_seq_input_layers(cols=cross_arr_name_list)
# inputs_all = inputs_all + list(seq_inputs_dict.values()) # 输入层list 做交叉
# cross_emb_out = []
# last_col = ''
# for index, col in enumerate(cross_arr_name_list):
# # print(col, 'get embedding!')
# emb_layer = get_emb_layer(
# col, trainable=False, emb_matrix=dict_cross_emb_all[col])
# x = emb_layer(inputs_all[1+index])
# if col.split('_')[-1] == 'i':
# cross_user_item_i = x
# last_col = col
# continue
# else:
# print(f'crossing net add {last_col} and {col}')
# cross_emb_out.append(
# cross_net(cross_user_item_i, x, layer_slotid_nettype, hidden_unit=4))
# cross_emb_out = tf.keras.layers.concatenate(cross_emb_out)
# cross_emb_out = tf.squeeze(cross_emb_out, [1])
#!################################################################################################################
# seq_inputs_dict = get_seq_input_layers(cols=arr_name_list)
# inputs_all = inputs_all+list(seq_inputs_dict.values()) # 输入层list
# masks = tf.equal(seq_inputs_dict['task_id'], 0)
# # 普通序列+label序列
# layers2concat = []
# for index, col in enumerate(arr_name_list):
# print(col, 'get embedding!')
# emb_layer = get_emb_layer(
# col, trainable=TRAINABLE_DICT[col], emb_matrix=id_list_dict_emb_all[col][1])
# x = emb_layer(seq_inputs_dict[col])
# if conv1d_info_dict[col] > -1:
# cov_layer = tf.keras.layers.Conv1D(filters=conv1d_info_dict[col],
# kernel_size=1,
# activation='relu')
# x = cov_layer(x)
# layers2concat.append(x)
# x = tf.keras.layers.concatenate(layers2concat)
#!################################################################################################################
#!mix1
# x = trans_net(x, masks, hidden_unit=256)
# max_pool = tf.keras.layers.GlobalMaxPooling1D()
# average_pool = tf.keras.layers.GlobalAveragePooling1D()
# xmaxpool = max_pool(x)
# xmeanpool = average_pool(x)
# trans_output = tf.keras.layers.concatenate([xmaxpool, xmeanpool])
#!################################################################################################################
#!mix2
features = build_input_features(linear_feature_columns +
dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features,
linear_feature_columns,
seed=seed,
prefix='linear',
l2_reg=l2_reg_linear)
group_embedding_dict, dense_value_list = input_from_feature_columns(
features,
dnn_feature_columns,
l2_reg_embedding,
seed,
support_group=True)
fm_logit = add_func([
FM()(concat_func(v, axis=1)) for k, v in group_embedding_dict.items()
if k in fm_group
])
dnn_input = combined_dnn_input(
list(chain.from_iterable(group_embedding_dict.values())),
dense_value_list)
# mix = concatenate([cross_emb_out, trans_output,
# dnn_input], axis=-1) # !#mix
mix = dnn_input
dnn_output = DNN(dnn_hidden_units, dnn_activation, l2_reg_dnn, dnn_dropout,
dnn_use_bn, seed)(mix)
dnn_logit = tf.keras.layers.Dense(1, use_bias=False,
activation=None)(dnn_output)
final_logit = add_func([linear_logit, fm_logit, dnn_logit])
output = PredictionLayer(task)(final_logit)
#!################################################################################################################
# model = Model(inputs=inputs_all+[features],
model = Model(inputs=inputs_list, outputs=[output])
print(model.summary())
return model
def create_model(linear_feature_columns,
dnn_feature_columns,
fm_group=[DEFAULT_GROUP_NAME],
dnn_hidden_units=(128, 128),
l2_reg_linear=0.00001,
l2_reg_embedding=0.00001,
l2_reg_dnn=0,
seed=1024,
dnn_dropout=0,
dnn_activation='relu',
dnn_use_bn=False,
task='binary'):
K.clear_session()
#!################################################################################################################
inputs_all = [
# get_input_feature_layer(name = 'user_0',feature_shape = dense_feature_size),
# get_input_feature_layer(name = 'item_0',feature_shape = dense_feature_size),
get_input_feature_layer(name='user_1',
feature_shape=dense_feature_size),
get_input_feature_layer(name='item_1',
feature_shape=dense_feature_size)
]
# slotid_nettype
# layer_user_0 = inputs_all[0]
# layer_user_0 = K.expand_dims(layer_user_0, 1)
# layer_item_0 = inputs_all[1]
# layer_item_0 = K.expand_dims(layer_item_0, 1)
layer_user_1 = inputs_all[0]
layer_user_1 = K.expand_dims(layer_user_1, 1)
layer_item_1 = inputs_all[1]
layer_item_1 = K.expand_dims(layer_item_1, 1)
# cross_emb_out0 = cross_net(layer_user_0,layer_item_0)
cross_emb_out1 = cross_net(layer_user_1, layer_item_1)
# cross_emb_out = tf.keras.layers.concatenate([cross_emb_out0,cross_emb_out1])
cross_emb_out = tf.squeeze(cross_emb_out1, [1])
#!################################################################################################################
seq_inputs_dict = get_seq_input_layers(cols=arr_name_list)
inputs_all = inputs_all + list(seq_inputs_dict.values()) # 输入层list
masks = tf.equal(seq_inputs_dict['task_id'], 0)
# 普通序列+label序列
layers2concat = []
for index, col in enumerate(arr_name_list):
print(col, 'get embedding!')
emb_layer = get_emb_layer(col,
trainable=TRAINABLE_DICT[col],
emb_matrix=id_list_dict_emb_all[col][1])
x = emb_layer(seq_inputs_dict[col])
if conv1d_info_dict[col] > -1:
cov_layer = tf.keras.layers.Conv1D(filters=conv1d_info_dict[col],
kernel_size=1,
activation='relu')
x = cov_layer(x)
layers2concat.append(x)
x = keras.layers.concatenate(layers2concat)
#!################################################################################################################
#!mix1
x = trans_net(x, masks, hidden_unit=256)
max_pool = tf.keras.layers.GlobalMaxPooling1D()
average_pool = tf.keras.layers.GlobalAveragePooling1D()
xmaxpool = max_pool(x)
xmeanpool = average_pool(x)
trans_output = tf.keras.layers.concatenate([xmaxpool, xmeanpool])
#!################################################################################################################
#!mix2
features = build_input_features(linear_feature_columns +
dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features,
linear_feature_columns,
seed=seed,
prefix='linear',
l2_reg=l2_reg_linear)
group_embedding_dict, dense_value_list = input_from_feature_columns(
features,
dnn_feature_columns,
l2_reg_embedding,
seed,
support_group=True)
fm_logit = add_func([
FM()(concat_func(v, axis=1)) for k, v in group_embedding_dict.items()
if k in fm_group
])
dnn_input = combined_dnn_input(
list(chain.from_iterable(group_embedding_dict.values())),
dense_value_list)
mix = concatenate([cross_emb_out, trans_output, dnn_input],
axis=-1) # !#mix
dnn_output = DNN(dnn_hidden_units, dnn_activation, l2_reg_dnn, dnn_dropout,
dnn_use_bn, seed)(mix)
dnn_logit = tf.keras.layers.Dense(1, use_bias=False,
activation=None)(dnn_output)
final_logit = add_func([linear_logit, fm_logit, dnn_logit])
output = PredictionLayer(task)(final_logit)
#!################################################################################################################
model = Model(inputs=inputs_all + [features], outputs=[output])
print(model.summary())
return model
def xDeepFM_MTL(linear_feature_columns,
dnn_feature_columns,
dnn_hidden_units=(256, 256),
task_net_size=(128, ),
cin_layer_size=(
128,
128,
),
cin_split_half=True,
cin_activation='relu',
l2_reg_linear=0.00001,
l2_reg_embedding=0.00001,
l2_reg_dnn=0,
l2_reg_cin=0,
seed=1024,
dnn_dropout=0,
dnn_activation='relu',
dnn_use_bn=False,
task='binary'):
"""Instantiates the xDeepFM 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 cin_layer_size: list,list of positive integer or empty list, the feature maps in each hidden layer of Compressed Interaction Network
:param cin_split_half: bool.if set to True, half of the feature maps in each hidden will connect to output unit
:param cin_activation: activation function used on feature maps
:param l2_reg_linear: float. L2 regularizer strength applied to linear part
:param l2_reg_embedding: L2 regularizer strength applied to embedding vector
:param l2_reg_dnn: L2 regularizer strength applied to deep net
:param l2_reg_cin: L2 regularizer strength applied to CIN.
: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 dnn_use_bn: bool. Whether use BatchNormalization before activation or not in DNN
:param task: str, ``"binary"`` for binary logloss or ``"regression"`` for regression loss
:return: A Keras model instance.
"""
features = build_input_features(linear_feature_columns +
dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features,
linear_feature_columns,
seed=seed,
prefix='linear',
l2_reg=l2_reg_linear)
sparse_embedding_list, dense_value_list = input_from_feature_columns(
features, dnn_feature_columns, l2_reg_embedding, seed)
fm_input = concat_func(sparse_embedding_list, axis=1)
if len(cin_layer_size) > 0:
exFM_out = CIN(cin_layer_size, cin_activation, cin_split_half,
l2_reg_cin, seed)(fm_input)
exFM_logit = tf.keras.layers.Dense(
1, kernel_initializer=tf.keras.initializers.glorot_normal(seed))(
exFM_out)
dnn_input = combined_dnn_input(sparse_embedding_list, dense_value_list)
dnn_output = DNN(dnn_hidden_units,
dnn_activation,
l2_reg_dnn,
dnn_dropout,
dnn_use_bn,
seed=seed)(dnn_input)
finish_out = DNN(task_net_size)(dnn_output)
finish_logit = tf.keras.layers.Dense(1, use_bias=False,
activation=None)(finish_out)
like_out = DNN(task_net_size)(dnn_output)
like_logit = tf.keras.layers.Dense(1, use_bias=False,
activation=None)(like_out)
finish_logit = tf.keras.layers.add(
[linear_logit, finish_logit, exFM_logit])
like_logit = tf.keras.layers.add([linear_logit, like_logit, exFM_logit])
output_finish = PredictionLayer('binary', name='finish')(finish_logit)
output_like = PredictionLayer('binary', name='like')(like_logit)
model = tf.keras.models.Model(inputs=inputs_list,
outputs=[output_finish, output_like])
return model
def DeepAutoInt(
linear_feature_columns,
dnn_feature_columns,
att_layer_num=3,
att_embedding_size=8,
att_head_num=2,
att_res=True,
dnn_hidden_units=(256, 256),
dnn_activation='relu',
l2_reg_linear=1e-5,
l2_reg_embedding=1e-5,
l2_reg_dnn=0,
dnn_use_bn=False,
dnn_dropout=0,
seed=1024,
fm_group=[DEFAULT_GROUP_NAME],
task='binary',
):
"""Instantiates the AutoInt 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 att_layer_num: int.The InteractingLayer number to be used.
:param att_embedding_size: int.The embedding size in multi-head self-attention network.
:param att_head_num: int.The head number in multi-head self-attention network.
:param att_res: bool.Whether or not use standard residual connections before output.
:param dnn_hidden_units: list,list of positive integer or empty list, the layer number and units in each layer of DNN
:param dnn_activation: Activation function to use in DNN
:param l2_reg_linear: float. L2 regularizer strength applied to linear part
:param l2_reg_embedding: float. L2 regularizer strength applied to embedding vector
:param l2_reg_dnn: float. L2 regularizer strength applied to DNN
:param dnn_use_bn: bool. Whether use BatchNormalization before activation or not in DNN
:param dnn_dropout: float in [0,1), the probability we will drop out a given DNN coordinate.
:param seed: integer ,to use as random seed.
:param task: str, ``"binary"`` for binary logloss or ``"regression"`` for regression loss
:return: A Keras model instance.
"""
if len(dnn_hidden_units) <= 0 and att_layer_num <= 0:
raise ValueError("Either hidden_layer or att_layer_num must > 0")
features = build_input_features(dnn_feature_columns)
inputs_list = list(features.values())
linear_logit = get_linear_logit(features,
linear_feature_columns,
seed=seed,
prefix='linear',
l2_reg=l2_reg_linear)
group_embedding_dict, dense_value_list = input_from_feature_columns(
features,
dnn_feature_columns,
l2_reg_embedding,
seed,
support_group=True)
sparse_embedding_list = list(
chain.from_iterable(group_embedding_dict.values()))
fm_logit = add_func([
FM()(concat_func(v, axis=1)) for k, v in group_embedding_dict.items()
if k in fm_group
])
# sparse_embedding_list, dense_value_list = input_from_feature_columns(features, dnn_feature_columns,
# l2_reg_embedding, seed)
att_input = concat_func(sparse_embedding_list, axis=1)
for _ in range(att_layer_num):
att_input = InteractingLayer(att_embedding_size, att_head_num,
att_res)(att_input)
att_output = tf.keras.layers.Flatten()(att_input)
dnn_input = combined_dnn_input(sparse_embedding_list, dense_value_list)
if len(dnn_hidden_units
) > 0 and att_layer_num > 0: # Deep & Interacting Layer
deep_out = DNN(dnn_hidden_units,
dnn_activation,
l2_reg_dnn,
dnn_dropout,
dnn_use_bn,
seed=seed)(dnn_input)
stack_out = tf.keras.layers.Concatenate()([att_output, deep_out])
final_logit = tf.keras.layers.Dense(
1,
use_bias=False,
kernel_initializer=tf.keras.initializers.glorot_normal(seed))(
stack_out)
elif len(dnn_hidden_units) > 0: # Only Deep
deep_out = DNN(dnn_hidden_units,
dnn_activation,
l2_reg_dnn,
dnn_dropout,
dnn_use_bn,
seed=seed)(dnn_input)
final_logit = tf.keras.layers.Dense(
1,
use_bias=False,
kernel_initializer=tf.keras.initializers.glorot_normal(seed))(
deep_out)
elif att_layer_num > 0: # Only Interacting Layer
final_logit = tf.keras.layers.Dense(
1,
use_bias=False,
kernel_initializer=tf.keras.initializers.glorot_normal(seed))(
att_output)
else: # Error
raise NotImplementedError
# final_logit = tf.keras.layers.Dense(
# 1, use_bias=False, kernel_initializer=tf.keras.initializers.glorot_normal(seed))(att_output)
final_logit = add_func([linear_logit, fm_logit, final_logit])
output = PredictionLayer(task)(final_logit)
model = tf.keras.models.Model(inputs=inputs_list, outputs=output)
return model