import paddle.fluid as fluid import math from paddlerec.core.utils import envs from paddlerec.core.model import Model as ModelBase class Model(ModelBase): def __init__(self, config): ModelBase.__init__(self, config) def config_read(self, config_path): with open(config_path, "r") as fin: user_count = int(fin.readline().strip()) item_count = int(fin.readline().strip()) cat_count = int(fin.readline().strip()) return user_count, item_count, cat_count def din_attention(self, hist, target_expand, mask): """activation weight""" hidden_size = hist.shape[-1] concat = fluid.layers.concat( [hist, target_expand, hist - target_expand, hist * target_expand], axis=2) atten_fc1 = fluid.layers.fc(name="atten_fc1", input=concat, size=80, act=self.act, num_flatten_dims=2) atten_fc2 = fluid.layers.fc(name="atten_fc2", input=atten_fc1, size=40, act=self.act, num_flatten_dims=2) atten_fc3 = fluid.layers.fc(name="atten_fc3", input=atten_fc2, size=1, num_flatten_dims=2) atten_fc3 += mask atten_fc3 = fluid.layers.transpose(x=atten_fc3, perm=[0, 2, 1]) atten_fc3 = fluid.layers.scale(x=atten_fc3, scale=hidden_size**-0.5) weight = fluid.layers.softmax(atten_fc3) out = fluid.layers.matmul(weight, hist) out = fluid.layers.reshape(x=out, shape=[0, hidden_size]) return out def train_net(self): seq_len = -1 self.item_emb_size = envs.get_global_env("hyper_parameters.item_emb_size", 64, self._namespace) self.cat_emb_size = envs.get_global_env("hyper_parameters.cat_emb_size", 64, self._namespace) self.act = envs.get_global_env("hyper_parameters.act", "sigmoid", self._namespace) #item_emb_size = 64 #cat_emb_size = 64 self.is_sparse = envs.get_global_env("hyper_parameters.is_sparse", False, self._namespace) #significant for speeding up the training process self.config_path = envs.get_global_env("hyper_parameters.config_path", "data/config.txt", self._namespace) self.use_DataLoader = envs.get_global_env("hyper_parameters.use_DataLoader", False, self._namespace) user_count, item_count, cat_count = self.config_read(self.config_path) item_emb_attr = fluid.ParamAttr(name="item_emb") cat_emb_attr = fluid.ParamAttr(name="cat_emb") hist_item_seq = fluid.data( name="hist_item_seq", shape=[None, seq_len], dtype="int64") self._data_var.append(hist_item_seq) hist_cat_seq = fluid.data( name="hist_cat_seq", shape=[None, seq_len], dtype="int64") self._data_var.append(hist_cat_seq) target_item = fluid.data(name="target_item", shape=[None], dtype="int64") self._data_var.append(target_item) target_cat = fluid.data(name="target_cat", shape=[None], dtype="int64") self._data_var.append(target_cat) label = fluid.data(name="label", shape=[None, 1], dtype="float32") self._data_var.append(label) mask = fluid.data(name="mask", shape=[None, seq_len, 1], dtype="float32") self._data_var.append(mask) target_item_seq = fluid.data( name="target_item_seq", shape=[None, seq_len], dtype="int64") self._data_var.append(target_item_seq) target_cat_seq = fluid.data( name="target_cat_seq", shape=[None, seq_len], dtype="int64") self._data_var.append(target_cat_seq) if self.use_DataLoader: self._data_loader = fluid.io.DataLoader.from_generator( feed_list=self._data_var, capacity=10000, use_double_buffer=False, iterable=False) hist_item_emb = fluid.embedding( input=hist_item_seq, size=[item_count, self.item_emb_size], param_attr=item_emb_attr, is_sparse=self.is_sparse) hist_cat_emb = fluid.embedding( input=hist_cat_seq, size=[cat_count, self.cat_emb_size], param_attr=cat_emb_attr, is_sparse=self.is_sparse) target_item_emb = fluid.embedding( input=target_item, size=[item_count, self.item_emb_size], param_attr=item_emb_attr, is_sparse=self.is_sparse) target_cat_emb = fluid.embedding( input=target_cat, size=[cat_count, self.cat_emb_size], param_attr=cat_emb_attr, is_sparse=self.is_sparse) target_item_seq_emb = fluid.embedding( input=target_item_seq, size=[item_count, self.item_emb_size], param_attr=item_emb_attr, is_sparse=self.is_sparse) target_cat_seq_emb = fluid.embedding( input=target_cat_seq, size=[cat_count, self.cat_emb_size], param_attr=cat_emb_attr, is_sparse=self.is_sparse) item_b = fluid.embedding( input=target_item, size=[item_count, 1], param_attr=fluid.initializer.Constant(value=0.0)) hist_seq_concat = fluid.layers.concat([hist_item_emb, hist_cat_emb], axis=2) target_seq_concat = fluid.layers.concat( [target_item_seq_emb, target_cat_seq_emb], axis=2) target_concat = fluid.layers.concat( [target_item_emb, target_cat_emb], axis=1) out = self.din_attention(hist_seq_concat, target_seq_concat, mask) out_fc = fluid.layers.fc(name="out_fc", input=out, size=self.item_emb_size + self.cat_emb_size, num_flatten_dims=1) embedding_concat = fluid.layers.concat([out_fc, target_concat], axis=1) fc1 = fluid.layers.fc(name="fc1", input=embedding_concat, size=80, act=self.act) fc2 = fluid.layers.fc(name="fc2", input=fc1, size=40, act=self.act) fc3 = fluid.layers.fc(name="fc3", input=fc2, size=1) logit = fc3 + item_b loss = fluid.layers.sigmoid_cross_entropy_with_logits(x=logit, label=label) avg_loss = fluid.layers.mean(loss) self._cost = avg_loss self.predict = fluid.layers.sigmoid(logit) predict_2d = fluid.layers.concat([1 - self.predict, self.predict], 1) label_int = fluid.layers.cast(label, 'int64') auc_var, batch_auc_var, _ = fluid.layers.auc(input=predict_2d, label=label_int, slide_steps=0) self._metrics["AUC"] = auc_var self._metrics["BATCH_AUC"] = batch_auc_var def optimizer(self): learning_rate = envs.get_global_env("hyper_parameters.learning_rate", None, self._namespace) optimizer = fluid.optimizer.Adam(learning_rate, lazy_mode=True) return optimizer def infer_net(self, parameter_list): self.deepfm_net()