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function.py
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function.py
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import tensorflow as tf
from load import load_data
import pickle
# 调用load.py, 加载数据并进行预处理
title_count, title_set, genres2int, features, targets_values, ratings, users, movies, data, movies_orig, users_orig = load_data()
sentences_size = title_count # 电影名称的长度
embed_dim = 32 # 嵌入矩阵的维度
num_epochs = 10 # 迭代次数
batch_size = 256 # batch的大小
dropout_keep = 0.5 # dropout比例
learning_rate = 0.0001 # 学习率
save_dir = './model/save' # 生成模型的保存路径
# 用户信息
user_gender = {'M':'男性','F':'女性'}
user_age = {1:"Under 18",18: "18-24",25: "25-34",35: "35-44",45: "45-49", 50: "50-55",56: "56+"}
user_occupation = {0: "other" , 1: "academic/educator",2: "artist",
3: "clerical/admin",4: "college/grad student",5: "customer service",
6: "doctor/health care",7: "executive/managerial",8: "farmer",
9: "homemaker",10: "K-12 student",11: "lawyer",
12: "programmer",13: "retired",14: "sales/marketing",
15: "scientist",16: "self-employed",17: "technician/engineer",
18: "tradesman/craftsman",19: "unemployed",20: "writer"}
# 获取输入信息
def get_inputs():
uid = tf.placeholder(tf.int32, [None, 1], name="uid")
user_gender = tf.placeholder(tf.int32, [None, 1], name="user_gender")
user_age = tf.placeholder(tf.int32, [None, 1], name="user_age")
user_job = tf.placeholder(tf.int32, [None, 1], name="user_job")
movie_id = tf.placeholder(tf.int32, [None, 1], name="movie_id")
movie_categories = tf.placeholder(tf.int32, [None, 18], name="movie_categories")
movie_titles = tf.placeholder(tf.int32, [None, 15], name="movie_titles")
targets = tf.placeholder(tf.int32, [None, 1], name="targets")
LearningRate = tf.placeholder(tf.float32, name="LearningRate")
dropout_keep_prob = tf.placeholder(tf.float32, name="dropout_keep_prob")
return uid, user_gender, user_age, user_job, movie_id, movie_categories, movie_titles, targets, LearningRate, dropout_keep_prob
# 定义User的嵌入矩阵
def get_user_embedding(uid, user_gender, user_age, user_job):
with tf.name_scope("user_embedding"):
uid_max = max(features.take(0, 1)) + 1 # 用户ID数量
gender_max = max(features.take(2, 1)) + 1 # 性别类别数量
age_max = max(features.take(3, 1)) + 1 # 年龄类别数量
job_max = max(features.take(4, 1)) + 1 # 职业类别数量
uid_embed_matrix = tf.Variable(tf.random_uniform([uid_max, embed_dim], -1, 1), name="uid_embed_matrix")
uid_embed_layer = tf.nn.embedding_lookup(uid_embed_matrix, uid, name="uid_embed_layer")
gender_embed_matrix = tf.Variable(tf.random_uniform([gender_max, embed_dim // 2], -1, 1), name="gender_embed_matrix")
gender_embed_layer = tf.nn.embedding_lookup(gender_embed_matrix, user_gender, name="gender_embed_layer")
age_embed_matrix = tf.Variable(tf.random_uniform([age_max, embed_dim // 2], -1, 1), name="age_embed_matrix")
age_embed_layer = tf.nn.embedding_lookup(age_embed_matrix, user_age, name="age_embed_layer")
job_embed_matrix = tf.Variable(tf.random_uniform([job_max, embed_dim // 2], -1, 1), name="job_embed_matrix")
job_embed_layer = tf.nn.embedding_lookup(job_embed_matrix, user_job, name="job_embed_layer")
return uid_embed_layer, gender_embed_layer, age_embed_layer, job_embed_layer
# 将User的嵌入矩阵一起全连接生成User的特征
def get_user_feature_layer(uid_embed_layer, gender_embed_layer, age_embed_layer, job_embed_layer):
with tf.name_scope("user_fc"):
# 第一层全连接
uid_fc_layer = tf.layers.dense(uid_embed_layer, embed_dim, name="uid_fc_layer", activation=tf.nn.relu)
gender_fc_layer = tf.layers.dense(gender_embed_layer, embed_dim, name="gender_fc_layer", activation=tf.nn.relu)
age_fc_layer = tf.layers.dense(age_embed_layer, embed_dim, name="age_fc_layer", activation=tf.nn.relu)
job_fc_layer = tf.layers.dense(job_embed_layer, embed_dim, name="job_fc_layer", activation=tf.nn.relu)
# 第二层全连接
user_combine_layer = tf.concat([uid_fc_layer, gender_fc_layer, age_fc_layer, job_fc_layer], 2) # (?, 1, 128)
user_combine_layer = tf.contrib.layers.fully_connected(user_combine_layer, 200, tf.tanh) # (?, 1, 200)
user_combine_layer_flat = tf.reshape(user_combine_layer, [-1, 200])
return user_combine_layer, user_combine_layer_flat
# 将User的嵌入矩阵一起全连接生成User的特征
def get_movie_id_embed_layer(movie_id):
with tf.name_scope("movie_embedding"):
movie_id_max = max(features.take(1, 1)) + 1 # 电影ID数量
movie_id_embed_matrix = tf.Variable(tf.random_uniform([movie_id_max, embed_dim], -1, 1), name = "movie_id_embed_matrix")
movie_id_embed_layer = tf.nn.embedding_lookup(movie_id_embed_matrix, movie_id, name = "movie_id_embed_layer")
return movie_id_embed_layer
# 对电影类型的多个嵌入向量做加和
def get_movie_categories_layers(movie_categories):
with tf.name_scope("movie_categories_layers"):
movie_categories_max = max(genres2int.values()) + 1 # 电影类型个数
movie_categories_embed_matrix = tf.Variable(tf.random_uniform([movie_categories_max, embed_dim], -1, 1), name = "movie_categories_embed_matrix")
movie_categories_embed_layer = tf.nn.embedding_lookup(movie_categories_embed_matrix, movie_categories, name = "movie_categories_embed_layer")
movie_categories_embed_layer = tf.reduce_sum(movie_categories_embed_layer, axis=1, keepdims=True)
return movie_categories_embed_layer
# 对电影类型的多个嵌入向量做加法
def get_movie_cnn_layer(dropout_keep_prob, movie_titles):
# 从嵌入矩阵中得到电影名对应的各个单词的嵌入向量
with tf.name_scope("movie_embedding"):
movie_title_max = len(title_set) # 电影名称单词个数
movie_title_embed_matrix = tf.Variable(tf.random_uniform([movie_title_max, embed_dim], -1, 1), name="movie_title_embed_matrix")
movie_title_embed_layer = tf.nn.embedding_lookup(movie_title_embed_matrix, movie_titles, name="movie_title_embed_layer")
movie_title_embed_layer_expand = tf.expand_dims(movie_title_embed_layer, -1)
# 对文本嵌入层使用不同尺寸的卷积核做卷积和最大池化
pool_layer_lst = []
filter_num = 8 # 文本卷积核数量
window_sizes = {2, 3, 4, 5} # 文本卷积滑动窗口，可滑动2, 3, 4, 5个单词
for window_size in window_sizes:
with tf.name_scope("movie_txt_conv_maxpool_{}".format(window_size)):
filter_weights = tf.Variable(tf.truncated_normal([window_size, embed_dim, 1, filter_num], stddev=0.1), name="filter_weights")
filter_bias = tf.Variable(tf.constant(0.1, shape=[filter_num]), name="filter_bias")
conv_layer = tf.nn.conv2d(movie_title_embed_layer_expand, filter_weights, [1, 1, 1, 1], padding="VALID", name="conv_layer")
relu_layer = tf.nn.relu(tf.nn.bias_add(conv_layer, filter_bias), name="relu_layer")
maxpool_layer = tf.nn.max_pool(relu_layer, [1, sentences_size - window_size + 1, 1, 1], [1, 1, 1, 1], padding="VALID", name="maxpool_layer")
pool_layer_lst.append(maxpool_layer)
# Dropout层
with tf.name_scope("pool_dropout"):
pool_layer = tf.concat(pool_layer_lst, 3, name="pool_layer")
max_num = len(window_sizes) * filter_num
pool_layer_flat = tf.reshape(pool_layer, [-1, 1, max_num], name="pool_layer_flat")
dropout_layer = tf.nn.dropout(pool_layer_flat, dropout_keep_prob, name="dropout_layer")
return pool_layer_flat, dropout_layer
# 获取电影特征
def get_movie_feature_layer(movie_id_embed_layer, movie_categories_embed_layer, dropout_layer):
with tf.name_scope("movie_fc"):
# 第一层全连接
movie_id_fc_layer = tf.layers.dense(movie_id_embed_layer, embed_dim, name="movie_id_fc_layer", activation=tf.nn.relu)
movie_categories_fc_layer = tf.layers.dense(movie_categories_embed_layer, embed_dim, name="movie_categories_fc_layer", activation=tf.nn.relu)
# 第二层全连接
movie_combine_layer = tf.concat([movie_id_fc_layer, movie_categories_fc_layer, dropout_layer], 2) # (?, 1, 96)
movie_combine_layer = tf.contrib.layers.fully_connected(movie_combine_layer, 200, tf.tanh) # (?, 1, 200)
movie_combine_layer_flat = tf.reshape(movie_combine_layer, [-1, 200])
return movie_combine_layer, movie_combine_layer_flat
# 获取batch批处理
def get_batches(Xs, ys, batch_size):
for start in range(0, len(Xs), batch_size):
end = min(start + batch_size, len(Xs))
yield Xs[start:end], ys[start:end]
# 获取tensor
def get_tensors(loaded_graph):
uid = loaded_graph.get_tensor_by_name("uid:0")
user_gender = loaded_graph.get_tensor_by_name("user_gender:0")
user_age = loaded_graph.get_tensor_by_name("user_age:0")
user_job = loaded_graph.get_tensor_by_name("user_job:0")
movie_id = loaded_graph.get_tensor_by_name("movie_id:0")
movie_categories = loaded_graph.get_tensor_by_name("movie_categories:0")
movie_titles = loaded_graph.get_tensor_by_name("movie_titles:0")
targets = loaded_graph.get_tensor_by_name("targets:0")
dropout_keep_prob = loaded_graph.get_tensor_by_name("dropout_keep_prob:0")
lr = loaded_graph.get_tensor_by_name("LearningRate:0")
inference = loaded_graph.get_tensor_by_name("inference/ExpandDims:0")
movie_combine_layer_flat = loaded_graph.get_tensor_by_name("movie_fc/Reshape:0")
user_combine_layer_flat = loaded_graph.get_tensor_by_name("user_fc/Reshape:0")
return uid, user_gender, user_age, user_job, movie_id, movie_categories, movie_titles, targets, lr, dropout_keep_prob, inference, movie_combine_layer_flat, user_combine_layer_flat
# 保存模型参数
def save_params(params):
pickle.dump(params, open('./model/params.p', 'wb'))
# 加载模型参数
def load_params():
return pickle.load(open('./model/params.p', mode='rb'))
# 获取用户信息
def get_user_info(user):
info = []
info.append(user[0])
info.append(user_gender[user[1]])
info.append(user_age[user[2]])
info.append(user_occupation[user[3]])
return info