# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import paddle.fluid as fluid 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 _init_hyper_parameters(self): self.sparse_feature_number = envs.get_global_env( "hyper_parameters.sparse_feature_number", None) self.sparse_feature_dim = envs.get_global_env( "hyper_parameters.sparse_feature_dim", None) self.num_field = envs.get_global_env("hyper_parameters.num_field", None) self.layer_sizes_cin = envs.get_global_env( "hyper_parameters.layer_sizes_cin", None) self.layer_sizes_dnn = envs.get_global_env( "hyper_parameters.layer_sizes_dnn", None) self.act = envs.get_global_env("hyper_parameters.act", None) def net(self, inputs, is_infer=False): raw_feat_idx = self._sparse_data_var[1] raw_feat_value = self._dense_data_var[0] self.label = self._sparse_data_var[0] init_value_ = 0.1 initer = fluid.initializer.TruncatedNormalInitializer( loc=0.0, scale=init_value_) is_distributed = True if envs.get_trainer() == "CtrTrainer" else False # ------------------------- network input -------------------------- feat_idx = raw_feat_idx feat_value = fluid.layers.reshape( raw_feat_value, [-1, self.num_field, 1]) # None * num_field * 1 feat_embeddings = fluid.embedding( input=feat_idx, is_sparse=True, dtype='float32', size=[self.sparse_feature_number + 1, self.sparse_feature_dim], padding_idx=0, param_attr=fluid.ParamAttr(initializer=initer)) feat_embeddings = fluid.layers.reshape(feat_embeddings, [ -1, self.num_field, self.sparse_feature_dim ]) # None * num_field * embedding_size feat_embeddings = feat_embeddings * feat_value # None * num_field * embedding_size # -------------------- linear -------------------- weights_linear = fluid.embedding( input=feat_idx, is_sparse=True, dtype='float32', size=[self.sparse_feature_number + 1, 1], padding_idx=0, param_attr=fluid.ParamAttr(initializer=initer)) weights_linear = fluid.layers.reshape( weights_linear, [-1, self.num_field, 1]) # None * num_field * 1 b_linear = fluid.layers.create_parameter( shape=[1], dtype='float32', default_initializer=fluid.initializer.ConstantInitializer(value=0)) y_linear = fluid.layers.reduce_sum( (weights_linear * feat_value), 1) + b_linear # -------------------- CIN -------------------- Xs = [feat_embeddings] last_s = self.num_field for s in self.layer_sizes_cin: # calculate Z^(k+1) with X^k and X^0 X_0 = fluid.layers.reshape( fluid.layers.transpose(Xs[0], [0, 2, 1]), [-1, self.sparse_feature_dim, self.num_field, 1]) # None, embedding_size, num_field, 1 X_k = fluid.layers.reshape( fluid.layers.transpose(Xs[-1], [0, 2, 1]), [-1, self.sparse_feature_dim, 1, last_s]) # None, embedding_size, 1, last_s Z_k_1 = fluid.layers.matmul( X_0, X_k) # None, embedding_size, num_field, last_s # compresses Z^(k+1) to X^(k+1) Z_k_1 = fluid.layers.reshape(Z_k_1, [ -1, self.sparse_feature_dim, last_s * self.num_field ]) # None, embedding_size, last_s*num_field Z_k_1 = fluid.layers.transpose( Z_k_1, [0, 2, 1]) # None, s*num_field, embedding_size Z_k_1 = fluid.layers.reshape( Z_k_1, [-1, last_s * self.num_field, 1, self.sparse_feature_dim] ) # None, last_s*num_field, 1, embedding_size (None, channal_in, h, w) X_k_1 = fluid.layers.conv2d( Z_k_1, num_filters=s, filter_size=(1, 1), act=None, bias_attr=False, param_attr=fluid.ParamAttr( initializer=initer)) # None, s, 1, embedding_size X_k_1 = fluid.layers.reshape( X_k_1, [-1, s, self.sparse_feature_dim]) # None, s, embedding_size Xs.append(X_k_1) last_s = s # sum pooling y_cin = fluid.layers.concat(Xs[1:], 1) # None, (num_field++), embedding_size y_cin = fluid.layers.reduce_sum(y_cin, -1) # None, (num_field++) y_cin = fluid.layers.fc(input=y_cin, size=1, act=None, param_attr=fluid.ParamAttr(initializer=initer), bias_attr=None) y_cin = fluid.layers.reduce_sum(y_cin, dim=-1, keep_dim=True) # -------------------- DNN -------------------- y_dnn = fluid.layers.reshape( feat_embeddings, [-1, self.num_field * self.sparse_feature_dim]) for s in self.layer_sizes_dnn: y_dnn = fluid.layers.fc( input=y_dnn, size=s, act=self.act, param_attr=fluid.ParamAttr(initializer=initer), bias_attr=None) y_dnn = fluid.layers.fc(input=y_dnn, size=1, act=None, param_attr=fluid.ParamAttr(initializer=initer), bias_attr=None) # ------------------- xDeepFM ------------------ self.predict = fluid.layers.sigmoid(y_linear + y_cin + y_dnn) cost = fluid.layers.log_loss( input=self.predict, label=fluid.layers.cast(self.label, "float32"), epsilon=0.0000001) batch_cost = fluid.layers.reduce_mean(cost) self._cost = batch_cost # for auc predict_2d = fluid.layers.concat([1 - self.predict, self.predict], 1) label_int = fluid.layers.cast(self.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 if is_infer: self._infer_results["AUC"] = auc_var