# Copyright (c) 2018 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. from __future__ import print_function import math import sys import numpy as np import paddle import paddle.fluid as fluid import paddle.fluid.layers as layers import paddle.fluid.nets as nets IS_SPARSE = True USE_GPU = False BATCH_SIZE = 256 PASS_NUM = 100 def get_usr_combined_features(): USR_DICT_SIZE = paddle.dataset.movielens.max_user_id() + 1 uid = layers.data(name='user_id', shape=[1], dtype='int64') usr_emb = layers.embedding( input=uid, dtype='float32', size=[USR_DICT_SIZE, 32], param_attr='user_table', is_sparse=IS_SPARSE) usr_fc = layers.fc(input=usr_emb, size=32) USR_GENDER_DICT_SIZE = 2 usr_gender_id = layers.data(name='gender_id', shape=[1], dtype='int64') usr_gender_emb = layers.embedding( input=usr_gender_id, size=[USR_GENDER_DICT_SIZE, 16], param_attr='gender_table', is_sparse=IS_SPARSE) usr_gender_fc = layers.fc(input=usr_gender_emb, size=16) USR_AGE_DICT_SIZE = len(paddle.dataset.movielens.age_table) usr_age_id = layers.data(name='age_id', shape=[1], dtype="int64") usr_age_emb = layers.embedding( input=usr_age_id, size=[USR_AGE_DICT_SIZE, 16], is_sparse=IS_SPARSE, param_attr='age_table') usr_age_fc = layers.fc(input=usr_age_emb, size=16) USR_JOB_DICT_SIZE = paddle.dataset.movielens.max_job_id() + 1 usr_job_id = layers.data(name='job_id', shape=[1], dtype="int64") usr_job_emb = layers.embedding( input=usr_job_id, size=[USR_JOB_DICT_SIZE, 16], param_attr='job_table', is_sparse=IS_SPARSE) usr_job_fc = layers.fc(input=usr_job_emb, size=16) concat_embed = layers.concat( input=[usr_fc, usr_gender_fc, usr_age_fc, usr_job_fc], axis=1) usr_combined_features = layers.fc(input=concat_embed, size=200, act="tanh") return usr_combined_features def get_mov_combined_features(): MOV_DICT_SIZE = paddle.dataset.movielens.max_movie_id() + 1 mov_id = layers.data(name='movie_id', shape=[1], dtype='int64') mov_emb = layers.embedding( input=mov_id, dtype='float32', size=[MOV_DICT_SIZE, 32], param_attr='movie_table', is_sparse=IS_SPARSE) mov_fc = layers.fc(input=mov_emb, size=32) CATEGORY_DICT_SIZE = len(paddle.dataset.movielens.movie_categories()) category_id = layers.data( name='category_id', shape=[1], dtype='int64', lod_level=1) mov_categories_emb = layers.embedding( input=category_id, size=[CATEGORY_DICT_SIZE, 32], is_sparse=IS_SPARSE) mov_categories_hidden = layers.sequence_pool( input=mov_categories_emb, pool_type="sum") MOV_TITLE_DICT_SIZE = len(paddle.dataset.movielens.get_movie_title_dict()) mov_title_id = layers.data( name='movie_title', shape=[1], dtype='int64', lod_level=1) mov_title_emb = layers.embedding( input=mov_title_id, size=[MOV_TITLE_DICT_SIZE, 32], is_sparse=IS_SPARSE) mov_title_conv = nets.sequence_conv_pool( input=mov_title_emb, num_filters=32, filter_size=3, act="tanh", pool_type="sum") concat_embed = layers.concat( input=[mov_fc, mov_categories_hidden, mov_title_conv], axis=1) mov_combined_features = layers.fc(input=concat_embed, size=200, act="tanh") return mov_combined_features def inference_program(): usr_combined_features = get_usr_combined_features() mov_combined_features = get_mov_combined_features() inference = layers.cos_sim(X=usr_combined_features, Y=mov_combined_features) scale_infer = layers.scale(x=inference, scale=5.0) label = layers.data(name='score', shape=[1], dtype='float32') square_cost = layers.square_error_cost(input=scale_infer, label=label) avg_cost = layers.mean(square_cost) return scale_infer, avg_cost def optimizer_func(): return fluid.optimizer.SGD(learning_rate=0.2) def train(use_cuda, params_dirname): place = fluid.CUDAPlace(0) if use_cuda else fluid.CPUPlace() train_reader = paddle.batch( paddle.reader.shuffle(paddle.dataset.movielens.train(), buf_size=8192), batch_size=BATCH_SIZE) test_reader = paddle.batch( paddle.dataset.movielens.test(), batch_size=BATCH_SIZE) feed_order = [ 'user_id', 'gender_id', 'age_id', 'job_id', 'movie_id', 'category_id', 'movie_title', 'score' ] main_program = fluid.default_main_program() star_program = fluid.default_startup_program() scale_infer, avg_cost = inference_program() test_program = main_program.clone(for_test=True) sgd_optimizer = optimizer_func() sgd_optimizer.minimize(avg_cost) exe = fluid.Executor(place) def train_test(program, reader): count = 0 feed_var_list = [ program.global_block().var(var_name) for var_name in feed_order ] feeder_test = fluid.DataFeeder(feed_list=feed_var_list, place=place) test_exe = fluid.Executor(place) accumulated = len([avg_cost, scale_infer]) * [0] for test_data in reader(): avg_cost_np = test_exe.run( program=program, feed=feeder_test.feed(test_data), fetch_list=[avg_cost, scale_infer]) accumulated = [ x[0] + x[1][0] for x in zip(accumulated, avg_cost_np) ] count += 1 return [x / count for x in accumulated] def train_loop(): feed_list = [ main_program.global_block().var(var_name) for var_name in feed_order ] feeder = fluid.DataFeeder(feed_list, place) exe.run(star_program) for pass_id in range(PASS_NUM): for batch_id, data in enumerate(train_reader()): # train a mini-batch outs = exe.run( program=main_program, feed=feeder.feed(data), fetch_list=[avg_cost]) out = np.array(outs[0]) avg_cost_set = train_test(test_program, test_reader) # get test avg_cost test_avg_cost = np.array(avg_cost_set).mean() print("avg_cost: %s" % test_avg_cost) # if test_avg_cost < 4.0: # Change this number to adjust accuracy if batch_id == 20: if params_dirname is not None: fluid.io.save_inference_model(params_dirname, [ "user_id", "gender_id", "age_id", "job_id", "movie_id", "category_id", "movie_title" ], [scale_infer], exe) return else: print('BatchID {0}, Test Loss {1:0.2}'.format( pass_id + 1, float(test_avg_cost))) if math.isnan(float(out[0])): sys.exit("got NaN loss, training failed.") train_loop() def infer(use_cuda, params_dirname): place = fluid.CUDAPlace(0) if use_cuda else fluid.CPUPlace() # Use the first data from paddle.dataset.movielens.test() as input. # Use create_lod_tensor(data, lod, place) API to generate LoD Tensor, # where `data` is a list of sequences of index numbers, `lod` is # the level of detail (lod) info associated with `data`. # For example, data = [[10, 2, 3], [2, 3]] means that it contains # two sequences of indexes, of length 3 and 2, respectively. # Correspondingly, lod = [[3, 2]] contains one level of detail info, # indicating that `data` consists of two sequences of length 3 and 2. infer_movie_id = 783 infer_movie_name = paddle.dataset.movielens.movie_info()[ infer_movie_id].title exe = fluid.Executor(place) inference_scope = fluid.core.Scope() with fluid.scope_guard(inference_scope): # Use fluid.io.load_inference_model to obtain the inference program desc, # the feed_target_names (the names of variables that will be feeded # data using feed operators), and the fetch_targets (variables that # we want to obtain data from using fetch operators). [inferencer, feed_target_names, fetch_targets] = fluid.io.load_inference_model(params_dirname, exe) # Use the first data from paddle.dataset.movielens.test() as input assert feed_target_names[0] == "user_id" # Use create_lod_tensor(data, recursive_sequence_lengths, place) API # to generate LoD Tensor where `data` is a list of sequences of index # numbers, `recursive_sequence_lengths` is the length-based level of detail # (lod) info associated with `data`. # For example, data = [[10, 2, 3], [2, 3]] means that it contains # two sequences of indexes, of length 3 and 2, respectively. # Correspondingly, recursive_sequence_lengths = [[3, 2]] contains one # level of detail info, indicating that `data` consists of two sequences # of length 3 and 2, respectively. user_id = fluid.create_lod_tensor([[1L]], [[1]], place) assert feed_target_names[1] == "gender_id" gender_id = fluid.create_lod_tensor([[1L]], [[1]], place) assert feed_target_names[2] == "age_id" age_id = fluid.create_lod_tensor([[0L]], [[1]], place) assert feed_target_names[3] == "job_id" job_id = fluid.create_lod_tensor([[10L]], [[1]], place) assert feed_target_names[4] == "movie_id" movie_id = fluid.create_lod_tensor([[783L]], [[1]], place) assert feed_target_names[5] == "category_id" category_id = fluid.create_lod_tensor([[10L, 8L, 9L]], [[3]], place) assert feed_target_names[6] == "movie_title" movie_title = fluid.create_lod_tensor( [[1069L, 4140L, 2923L, 710L, 988L]], [[5]], place) # Construct feed as a dictionary of {feed_target_name: feed_target_data} # and results will contain a list of data corresponding to fetch_targets. results = exe.run( inferencer, feed={ feed_target_names[0]: user_id, feed_target_names[1]: gender_id, feed_target_names[2]: age_id, feed_target_names[3]: job_id, feed_target_names[4]: movie_id, feed_target_names[5]: category_id, feed_target_names[6]: movie_title }, fetch_list=fetch_targets, return_numpy=False) predict_rating = np.array(results[0]) print("Predict Rating of user id 1 on movie \"" + infer_movie_name + "\" is " + str(predict_rating[0][0])) print("Actual Rating of user id 1 on movie \"" + infer_movie_name + "\" is 4.") def main(use_cuda): if use_cuda and not fluid.core.is_compiled_with_cuda(): return params_dirname = "recommender_system.inference.model" train(use_cuda=use_cuda, params_dirname=params_dirname) infer(use_cuda=use_cuda, params_dirname=params_dirname) if __name__ == '__main__': main(USE_GPU)