FAQ

1. Save or load weights/models


To save/load weights,you can write codes just like any other keras models.

model = DeepFM()
model.save_weights('DeepFM_w.h5')
model.load_weights('DeepFM_w.h5')

To save/load models,just a little different.

from tensorflow.python.keras.models import  save_model,load_model
model = DeepFM()
save_model(model, 'DeepFM.h5')# save_model, same as before

from deepctr.utils import custom_objects
model = load_model('DeepFM.h5',custom_objects)# load_model,just add a parameter

2. Set learning rate and use earlystopping


You can use any models in DeepCTR like a keras model object. Here is a example of how to set learning rate and earlystopping:

import deepctr
from tensorflow.python.keras.optimizers import Adam,Adagrad
from tensorflow.python.keras.callbacks import EarlyStopping

model = deepctr.models.DeepFM({"sparse": sparse_feature_dict, "dense": dense_feature_list})
model.compile(Adagrad('0.0808'),'binary_crossentropy',metrics=['binary_crossentropy'])

es = EarlyStopping(monitor='val_binary_crossentropy')
history = model.fit(model_input, data[target].values,batch_size=256, epochs=10, verbose=2, validation_split=0.2,callbacks=[es] )

3. Get the attentional weights of feature interactions in AFM


First,make sure that you have install the latest version of deepctr.

Then,use the following code,the attentional_weights[:,i,0] is the feature_interactions[i]’s attentional weight of all samples.

import itertools
import deepctr
from tensorflow.python.keras.models import Model
from tensorflow.python.keras.layers import Lambda

feature_dim_dict = {"sparse": sparse_feature_dict, "dense": dense_feature_list}
model = deepctr.models.AFM(feature_dim_dict)
model.fit(model_input,target)

afmlayer = model.layers[-3]
afm_weight_model = Model(model.input,outputs=Lambda(lambda x:afmlayer.normalized_att_score)(model.input))
attentional_weights = afm_weight_model.predict(model_input,batch_size=4096)
feature_interactions = list(itertools.combinations(list(feature_dim_dict['sparse'].keys()) + feature_dim_dict['dense'] ,2))

4. Does the models support multi-value input?


Now multi-value input is avaliable for AFM,AutoInt,DCN,DeepFM,FNN,NFM,PNN,xDeepFM,you can read the example here.

For DIN please read the code example in run_din.py.

You can use layers in sequenceto build your own models! And it will be supported in a future release