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Author: zhaoyingjun

Chatbot-tensowflow2.0/Seq2seqchatbot/config/getConfig.py

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+# coding=utf-8
+import os
+from configparser import SafeConfigParser
+config_file=os.getcwd()+'/config/seq2seq.ini'
+if not os.path.exists(config_file):
+    config_file = os.path.dirname(os.getcwd()) + '/config/seq2seq.ini'
+#print(config_file)
+def get_config():
+    parser = SafeConfigParser()
+    parser.read(config_file)
+    # get the ints, floats and strings
+    _conf_ints = [ (key, int(value)) for key,value in parser.items('ints')]
+    _conf_floats = [ (key, float(value)) for key,value in parser.items('floats') ]
+    _conf_strings = [ (key, str(value)) for key,value in parser.items('strings') ]
+    return dict(_conf_ints +_conf_floats+ _conf_strings)

Chatbot-tensowflow2.0/Seq2seqchatbot/config/seq2seq.ini

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+[strings]
+# Mode : train, test, serve
+mode = train
+train_data=train_data
+seq_data = train_data/seq.data
+vocab_inp_path=train_data/inp.vocab
+vocab_tar_path=train_data/tar.vocab
+#训练集原始文件
+resource_data = train_data/xiaohuangji50w.conv
+#分割后的训练样本文件
+split_train_data=train_data/seq_data_
+#读取识别原始文件中段落和行头的标示
+e = E
+m = M
+model_data = model_data
+log_dir=log_dir
+[ints]
+# vocabulary size
+# 	20,000 is a reasonable size
+vocab_inp_size = 20000
+vocab_tar_size = 20000
+embedding_dim=128
+train_epoch=10
+# typical options : 128, 256, 512, 1024
+layer_size = 512
+batch_size = 64
+#句子的最长长度
+max_length=20
+number_work=2
+[floats]
+#设置最小Loss，当模型loss值达到这个水平后停止训练
+min_loss=0.2
+

Chatbot-tensowflow2.0/Seq2seqchatbot/data_util.py

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+# coding=utf-8
+import json
+import os
+import re
+import jieba
+from zhon.hanzi import punctuation
+from config import getConfig
+import io
+import tensorflow as tf
+
+# 加载参数配置文件
+gConfig = {}
+gConfig = getConfig.get_config()
+conv_path = gConfig['resource_data']
+vocab_inp_path = gConfig['vocab_inp_path']
+vocab_tar_path = gConfig['vocab_tar_path']
+vocab_inp_size = gConfig['vocab_inp_size']
+vocab_tar_size = gConfig['vocab_tar_size']
+seq_train = gConfig['seq_data']
+def predata_util():
+    # 判断训练语料文件是否存在，如果不存在则进行提醒
+    if not os.path.exists(conv_path):
+        print("找不到需要处理的文件，请确认在train_data文件中是否存在该文件")
+        exit()
+    # 新建一个文件，用于存放处理后的对话语料
+    seq_train = open(gConfig['seq_data'], 'w')
+    # 打开需要处理的语料，逐条读取并进行数据处理
+    with open(conv_path, encoding='utf-8') as f:
+        one_conv = ""  # 存储一次完整对话
+        i = 0
+        # 开始循环处理语料
+        for line in f:
+            line = line.strip('\n')
+            line = re.sub(r"[%s]+" % punctuation, "", line)  # 去除标点符号
+            if line == '':
+                continue
+            # 判断是否为一段对话的开始，如果是则把刚刚处理的语料保存下来
+            if line[0] == gConfig['e']:
+                if one_conv:
+                    seq_train.write(one_conv[:-1] + '\n')
+                    i = i + 1
+                    if i % 1000 == 0:
+                        print('处理进度：', i)
+                one_conv = ""
+            # 判断是否正在处理对话语句，如果是则进行语料的拼接处理 以及分词
+            elif line[0] == gConfig['m']:
+                one_conv = one_conv + str(" ".join(jieba.cut(line.split(' ')[1]))) + '\t'  # 存储一次问或答
+    # 处理完成，关闭文件
+    seq_train.close()
+
+def create_vocab(lang, vocab_path, vocab_size):
+    tokenizer = tf.keras.preprocessing.text.Tokenizer(num_words=vocab_size, oov_token=3)
+    tokenizer.fit_on_texts(lang)
+    vocab = json.loads(tokenizer.to_json(ensure_ascii=False))
+    vocab['index_word'] = tokenizer.index_word
+    vocab['word_index'] = tokenizer.word_index
+    vocab['document_count']=tokenizer.document_count
+    vocab = json.dumps(vocab, ensure_ascii=False)
+    with open(vocab_path, 'w', encoding='utf-8') as f:
+        f.write(vocab)
+    f.close()
+    print("字典保存在:{}".format(vocab_path))
+
+def preprocess_sentence(w):
+    w = 'start ' + w + ' end'
+    return w
+lines = io.open(seq_train, encoding='UTF-8').readlines()
+word_pairs = [[preprocess_sentence(w) for w in l.split('\t')] for l in lines]
+input_lang, target_lang = zip(*word_pairs)
+predata_util()
+create_vocab(input_lang,vocab_inp_path,vocab_inp_size)
+create_vocab(target_lang,vocab_tar_path,vocab_tar_size)
+

Chatbot-tensowflow2.0/Seq2seqchatbot/execute.py

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+# coding=utf-8
+#导入依赖包
+import json
+import os
+import sys
+import time
+import tensorflow as tf
+import seq2seqModel
+from config import getConfig
+import io
+#初始化超参字典，并对相应的参数进行赋值
+gConfig = {}
+gConfig= getConfig.get_config()
+vocab_inp_size = gConfig['vocab_inp_size']
+vocab_tar_size = gConfig['vocab_tar_size']
+embedding_dim=gConfig['embedding_dim']
+units=gConfig['layer_size']
+BATCH_SIZE=gConfig['batch_size']
+
+max_length_inp=gConfig['max_length']
+max_length_tar=gConfig['max_length']
+log_dir=gConfig['log_dir']
+writer = tf.summary.create_file_writer(log_dir)
+#对训练语料进行处理，上下文分别加上start end标示
+def preprocess_sentence(w):
+    w ='start '+ w + ' end'
+    return w
+#定义数据读取函数，从训练语料中读取数据并进行word2number的处理，并生成词典
+def read_data(path):
+    path = os.getcwd() + '/' + path
+    if not os.path.exists(path):
+        path=os.path.dirname(os.getcwd())+'/'+ path
+    lines = io.open(path, encoding='UTF-8').read().strip().split('\n')
+    word_pairs = [[preprocess_sentence(w) for w in l.split('\t')] for l in lines]
+    input_lang,target_lang=zip(*word_pairs)
+    input_tokenizer=tokenize(gConfig['vocab_inp_path'])
+    target_tokenizer=tokenize(gConfig['vocab_tar_path'])
+    input_tensor=input_tokenizer.texts_to_sequences(input_lang)
+    target_tensor=target_tokenizer.texts_to_sequences(target_lang)
+    input_tensor = tf.keras.preprocessing.sequence.pad_sequences(input_tensor, maxlen=max_length_inp,
+                                                           padding='post')
+    target_tensor= tf.keras.preprocessing.sequence.pad_sequences(target_tensor, maxlen=max_length_tar,
+                                                           padding='post')
+    return input_tensor,input_tokenizer,target_tensor,target_tokenizer
+#定义word2number函数，通过对语料的处理提取词典，并进行word2number处理以及padding补全
+def tokenize(vocab_file):
+    #从词典中读取预先生成tokenizer的config，构建词典矩阵
+    with open(vocab_file,'r',encoding='utf-8') as f:
+        tokenize_config=json.dumps(json.load(f),ensure_ascii=False)
+        lang_tokenizer=tf.keras.preprocessing.text.tokenizer_from_json(tokenize_config)
+    #利用词典进行word2number的转换以及padding处理
+    return lang_tokenizer
+input_tensor, input_token, target_tensor, target_token = read_data(gConfig['seq_data'])
+steps_per_epoch = len(input_tensor) // gConfig['batch_size']
+BUFFER_SIZE = len(input_tensor)
+dataset = tf.data.Dataset.from_tensor_slices((input_tensor,target_tensor)).shuffle(BUFFER_SIZE)
+dataset = dataset.batch(BATCH_SIZE, drop_remainder=True)
+enc_hidden = seq2seqModel.encoder.initialize_hidden_state()
+#定义训练函数
+def train():
+    # 从训练语料中读取数据并使用预生成词典word2number的转换
+    print("Preparing data in %s" % gConfig['train_data'])
+    print('每个epoch的训练步数: {}'.format(steps_per_epoch))
+    #如有已经有预训练的模型则加载预训练模型继续训练
+    checkpoint_dir = gConfig['model_data']
+    ckpt=tf.io.gfile.listdir(checkpoint_dir)
+    if ckpt:
+        print("reload pretrained model")
+        seq2seqModel.checkpoint.restore(tf.train.latest_checkpoint(checkpoint_dir))
+
+    #使用Dataset加载训练数据，Dataset可以加速数据的并发读取并进行训练效率的优化
+    checkpoint_prefix = os.path.join(checkpoint_dir, "ckpt")
+    start_time = time.time()
+    #current_loss=2
+    #min_loss=gConfig['min_loss']
+    epoch = 0
+    train_epoch = gConfig['train_epoch']
+    #开始进行循环训练，这里设置了一个结束循环的条件就是当loss小于设置的min_loss超参时终止训练
+    while epoch<train_epoch:
+        start_time_epoch = time.time()
+        total_loss = 0
+        #进行一个epoch的训练，训练的步数为steps_per_epoch
+        for batch,(inp, targ) in enumerate(dataset.take(steps_per_epoch)):
+            batch_loss = seq2seqModel.training_step(inp, targ,target_token, enc_hidden)
+            total_loss += batch_loss
+            print('epoch:{}batch:{} batch_loss: {}'.format(epoch,batch,batch_loss))
+        #结束一个epoch的训练后，更新current_loss，计算在本epoch中每步训练平均耗时、loss值
+        step_time_epoch = (time.time() - start_time_epoch) / steps_per_epoch
+        step_loss = total_loss / steps_per_epoch
+        current_steps = +steps_per_epoch
+        epoch_time_total = (time.time() - start_time)
+        print('训练总步数: {} 总耗时: {}  epoch平均每步耗时: {} 平均每步loss {:.4f}'
+              .format(current_steps, epoch_time_total, step_time_epoch, step_loss))
+        #将本epoch训练的模型进行保存，更新模型文件
+        seq2seqModel.checkpoint.save(file_prefix=checkpoint_prefix)
+        sys.stdout.flush()
+        epoch = epoch + 1
+        with writer.as_default():
+            tf.summary.scalar('loss', step_loss, step=epoch)
+#定义预测函数，用于根据上文预测下文对话
+def predict(sentence):
+    # 从词典中读取预先生成tokenizer的config，构建词典矩阵
+    input_tokenizer = tokenize(gConfig['vocab_inp_path'])
+    target_tokenizer = tokenize(gConfig['vocab_tar_path'])
+    #加载预训练的模型
+    checkpoint_dir = gConfig['model_data']
+    seq2seqModel.checkpoint.restore(tf.train.latest_checkpoint(checkpoint_dir))
+    #对输入的语句进行处理，加上start end标示
+    sentence = preprocess_sentence(sentence)
+    #进行word2number的转换
+    inputs = input_tokenizer.texts_to_sequences(sentence)
+    #进行padding的补全
+    inputs = tf.keras.preprocessing.sequence.pad_sequences([inputs],maxlen=max_length_inp,padding='post')
+    inputs = tf.convert_to_tensor(inputs)
+    result = ''
+    #初始化一个中间状态
+    hidden = [tf.zeros((1, units))]
+    #对输入上文进行encoder编码，提取特征
+    enc_out, enc_hidden = seq2seqModel.encoder(inputs, hidden)
+    dec_hidden = enc_hidden
+    #decoder的输入从start的对应Id开始正向输入
+    dec_input = tf.expand_dims([target_tokenizer.word_index['start']], 0)
+    #在最大的语句长度范围内容，使用模型中的decoder进行循环解码
+    for t in range(max_length_tar):
+        #获得解码结果，并使用argmax确定概率最大的id
+        predictions, dec_hidden, attention_weights = seq2seqModel.decoder(dec_input, dec_hidden, enc_out)
+        predicted_id = tf.argmax(predictions[0]).numpy()
+        #判断当前Id是否为语句结束表示，如果是则停止循环解码，否则进行number2word的转换，并进行语句拼接
+        if target_tokenizer.index_word[predicted_id] == 'end':
+            break
+        result += str(target_tokenizer.index_word[predicted_id]) + ' '
+        #将预测得到的id作为下一个时刻的decoder的输入
+        dec_input = tf.expand_dims([predicted_id], 0)
+    return result
+#main函数的入口，根据超参设置的模式启动不同工作模式
+if __name__ == '__main__':
+    #如果在启动python程序时指定了超参文件，则从超参文件中读取超参，否则从默认的超参文件中读取
+    if len(sys.argv) - 1:
+        gConfig = getConfig.get_config(sys.argv[1])
+    else:
+        gConfig = getConfig.get_config()
+    print('\n>> 执行器模式 : %s\n' %(gConfig['mode']))
+    if gConfig['mode'] == 'train':
+        print('现在进行模型的训练')
+        train()
+    elif gConfig['mode'] == 'serve':
+        print('当前为服务模式，请运行web程序，进行人机交互')
+

Chatbot-tensowflow2.0/Seq2seqchatbot/seq2seqModel.py

@@ -0,0 +1,117 @@
+# 导入依赖包
+import tensorflow as tf
+from config import getConfig
+tf.config.experimental_run_functions_eagerly(True)
+# 初始化超参字典
+gConfig = {}
+gConfig = getConfig.get_config()
+# 通过超参字典为vocab_inp_size、vocab_tar_size、embedding_dim、units等赋值
+vocab_inp_size = gConfig['vocab_inp_size']
+vocab_tar_size = gConfig['vocab_tar_size']
+embedding_dim = gConfig['embedding_dim']
+units = gConfig['layer_size']
+BATCH_SIZE=gConfig['batch_size']
+# 定义Encoder类
+class Encoder(tf.keras.Model):
+    # 初始化函数，对默认参数进行初始化
+    def __init__(self, vocab_size, embedding_dim, enc_units, batch_size):
+        super(Encoder, self).__init__()
+        self.enc_units = enc_units
+        self.batch_size = batch_size
+        self.embedding = tf.keras.layers.Embedding(vocab_size, embedding_dim)
+        self.gru = tf.keras.layers.GRU(self.enc_units, return_sequences=True, return_state=True,
+                                       recurrent_initializer='glorot_uniform')
+
+    # 定义调用函数，实现逻辑计算
+    def call(self, x, hidden):
+        x_emb = self.embedding(x)
+        output, state = self.gru(x_emb, initial_state=hidden)
+        return output, state
+    def initialize_hidden_state(self):
+        return tf.zeros((self.batch_size, self.enc_units))
+# 定义bahdanauAttention类，bahdanauAttention是常用的attention实现方法之一
+class BahdanauAttention(tf.keras.Model):
+    def __init__(self, units):
+        super(BahdanauAttention, self).__init__()
+        # 注意力网络的初始化
+        self.W1 = tf.keras.layers.Dense(units)
+        self.W2 = tf.keras.layers.Dense(units)
+        self.V = tf.keras.layers.Dense(1)
+
+    def call(self, query, values):
+        # 将query增加一个维度，以便可以与values进行线性相加
+        hidden_with_time_axis = tf.expand_dims(query, 1)
+        # 将quales与hidden_with_time_axis进行线性相加后，使用tanh进行非线性变换，最后输出一维的score
+        score = self.V(tf.nn.tanh(
+            self.W1(values) + self.W2(hidden_with_time_axis)))
+        # 使用softmax将score进行概率化转换，转为为概率空间
+        attention_weights = tf.nn.softmax(score, axis=1)
+        # 将权重与values（encoder_out)进行相乘，得到context_vector
+        context_vector = attention_weights * values
+        # 将乘机后的context_vector按行相加，进行压缩得到最终的context_vector
+        context_vector = tf.reduce_sum(context_vector, axis=1)
+        return context_vector, attention_weights
+
+
+class Decoder(tf.keras.Model):
+    def __init__(self, vocab_size, embedding_dim, dec_units, batch_sz):
+        super(Decoder, self).__init__()
+        # 初始化batch_sz、dec_units、embedding 、gru 、fc、attention
+        self.batch_sz = batch_sz
+        self.dec_units = dec_units
+        self.embedding = tf.keras.layers.Embedding(vocab_size, embedding_dim)
+        self.gru = tf.keras.layers.GRU(self.dec_units,
+                                       return_sequences=True,
+                                       return_state=True,
+                                       recurrent_initializer='glorot_uniform')
+        self.fc = tf.keras.layers.Dense(vocab_size)
+        self.attention = BahdanauAttention(self.dec_units)
+
+    def call(self, y, hidden, enc_output):
+        # 首先对enc_output、以及decoder的hidden计算attention，输出上下文语境向量
+        context_vector, attention_weights = self.attention(hidden, enc_output)
+        # 对decoder的输入进行embedding
+        y = self.embedding(y)
+        # 拼接上下文语境与decoder的输入embedding，并送入gru中
+        y = tf.concat([tf.expand_dims(context_vector, 1), y], axis=-1)
+        output, state = self.gru(y)
+        # 将gru的输出进行维度转换，送入全连接神经网络 得到最后的结果
+        output = tf.reshape(output, (-1, output.shape[2]))
+        y = self.fc(output)
+        return y, state, attention_weights
+    def initialize_hidden_state(self):
+        return tf.zeros((self.batch_size, self.dec_units))
+# 定义损失函数
+def loss_function(real, pred):
+    loss_object = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
+    # mask掉start,去除start对于loss的干扰
+    mask = tf.math.logical_not(tf.math.equal(real, 0))
+    loss_ = loss_object(real, pred)
+    mask = tf.cast(mask, dtype=loss_.dtype)  # 将bool型转换成数值
+    loss_ *= mask
+    return tf.reduce_mean(loss_)
+
+# 实例化encoder、decoder、optimizer、checkpoint等
+encoder = Encoder(vocab_inp_size, embedding_dim, units, BATCH_SIZE)
+decoder = Decoder(vocab_tar_size, embedding_dim, units, BATCH_SIZE)
+optimizer = tf.keras.optimizers.Adam()
+checkpoint = tf.train.Checkpoint(optimizer=optimizer, encoder=encoder, decoder=decoder)
+@tf.function
+def training_step(inp, targ, targ_lang, enc_hidden):
+    loss = 0
+    with tf.GradientTape() as tape:
+        enc_output, enc_hidden = encoder(inp, enc_hidden)
+        dec_hidden = enc_hidden
+        dec_input = tf.expand_dims([targ_lang.word_index['start']] * BATCH_SIZE, 1)
+        for t in range(1, targ.shape[1]):
+            predictions, dec_hidden, _ = decoder(dec_input, dec_hidden, enc_output)
+            loss += loss_function(targ[:, t], predictions)
+            dec_input = tf.expand_dims(targ[:, t], 1)
+    step_loss = (loss / int(targ.shape[1]))
+    variables = encoder.trainable_variables + decoder.trainable_variables
+    gradients = tape.gradient(loss, variables)
+    optimizer.apply_gradients(zip(gradients, variables))
+    return step_loss
+
+
+