聊天机器人教程

创建日期：2018年8月14日 | 最后更新：2025年1月24日 | 最后验证：2024年11月5日

作者： Matthew Inkawhich

在本教程中，我们将探索循环序列到序列模型的一个有趣用例。我们将使用康奈尔电影对话语料库 (Cornell Movie-Dialogs Corpus) 中的电影剧本训练一个简单的聊天机器人。

对话模型是人工智能研究中的热门话题。聊天机器人可以在各种场景中找到，包括客户服务应用和在线帮助台。这些机器人通常由基于检索的模型驱动，它们对特定形式的问题输出预定义的响应。在像公司 IT 帮助台这样高度受限的领域中，这些模型可能足够了，但是对于更通用的用例，它们不够健壮。教会机器在多个领域与人类进行有意义的对话是一个远未解决的研究问题。最近，深度学习的繁荣使得强大的生成模型成为可能，例如 Google 的神经对话模型 (Neural Conversational Model)，这标志着朝着多领域生成对话模型迈出了一大步。在本教程中，我们将在 PyTorch 中实现这种模型。

> hello?
Bot: hello .
> where am I?
Bot: you re in a hospital .
> who are you?
Bot: i m a lawyer .
> how are you doing?
Bot: i m fine .
> are you my friend?
Bot: no .
> you're under arrest
Bot: i m trying to help you !
> i'm just kidding
Bot: i m sorry .
> where are you from?
Bot: san francisco .
> it's time for me to leave
Bot: i know .
> goodbye
Bot: goodbye .

教程亮点

• 处理康奈尔电影对话语料库 (Cornell Movie-Dialogs Corpus) 数据集的加载和预处理

• 实现带Luong 注意力机制的序列到序列模型

• 使用小批量（mini-batches）联合训练编码器和解码器模型

• 实现贪婪搜索解码模块

• 与训练好的聊天机器人交互

致谢

本教程借鉴了以下来源的代码

1. Yuan-Kuei Wu 的 pytorch-chatbot 实现：https://github.com/ywk991112/pytorch-chatbot

2. Sean Robertson 的 practical-pytorch seq2seq-translation 示例：https://github.com/spro/practical-pytorch/tree/master/seq2seq-translation

3. FloydHub 康奈尔电影语料库预处理代码：https://github.com/floydhub/textutil-preprocess-cornell-movie-corpus

准备工作

首先，下载电影对话语料库 (Movie-Dialogs Corpus) 的 zip 文件。

# and put in a ``data/`` directory under the current directory.
#
# After that, let’s import some necessities.
#

import torch
from torch.jit import script, trace
import torch.nn as nn
from torch import optim
import torch.nn.functional as F
import csv
import random
import re
import os
import unicodedata
import codecs
from io import open
import itertools
import math
import json


# If the current `accelerator <https://pytorch.ac.cn/docs/stable/torch.html#accelerators>`__ is available,
# we will use it. Otherwise, we use the CPU.
device = torch.accelerator.current_accelerator().type if torch.accelerator.is_available() else "cpu"
print(f"Using {device} device")

Using cuda device

加载和预处理数据

下一步是重新格式化数据文件，并将数据加载到我们可以使用的结构中。

康奈尔电影对话语料库 (Cornell Movie-Dialogs Corpus) 是一个丰富的电影角色对话数据集

• 包含 10,292 对电影角色的 220,579 个对话交流

• 来自 617 部电影的 9,035 个角色

• 总计 304,713 条话语

这个数据集规模大且多样，语言正式度、时间段、情感等方面变化很大。我们希望这种多样性能够使我们的模型对多种形式的输入和查询具有鲁棒性。

首先，我们将查看数据文件的一些行，以了解原始格式。

corpus_name = "movie-corpus"
corpus = os.path.join("data", corpus_name)

def printLines(file, n=10):
    with open(file, 'rb') as datafile:
        lines = datafile.readlines()
    for line in lines[:n]:
        print(line)

printLines(os.path.join(corpus, "utterances.jsonl"))

b'{"id": "L1045", "conversation_id": "L1044", "text": "They do not!", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 1, "toks": [{"tok": "They", "tag": "PRP", "dep": "nsubj", "up": 1, "dn": []}, {"tok": "do", "tag": "VBP", "dep": "ROOT", "dn": [0, 2, 3]}, {"tok": "not", "tag": "RB", "dep": "neg", "up": 1, "dn": []}, {"tok": "!", "tag": ".", "dep": "punct", "up": 1, "dn": []}]}]}, "reply-to": "L1044", "timestamp": null, "vectors": []}\n'
b'{"id": "L1044", "conversation_id": "L1044", "text": "They do to!", "speaker": "u2", "meta": {"movie_id": "m0", "parsed": [{"rt": 1, "toks": [{"tok": "They", "tag": "PRP", "dep": "nsubj", "up": 1, "dn": []}, {"tok": "do", "tag": "VBP", "dep": "ROOT", "dn": [0, 2, 3]}, {"tok": "to", "tag": "TO", "dep": "dobj", "up": 1, "dn": []}, {"tok": "!", "tag": ".", "dep": "punct", "up": 1, "dn": []}]}]}, "reply-to": null, "timestamp": null, "vectors": []}\n'
b'{"id": "L985", "conversation_id": "L984", "text": "I hope so.", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 1, "toks": [{"tok": "I", "tag": "PRP", "dep": "nsubj", "up": 1, "dn": []}, {"tok": "hope", "tag": "VBP", "dep": "ROOT", "dn": [0, 2, 3]}, {"tok": "so", "tag": "RB", "dep": "advmod", "up": 1, "dn": []}, {"tok": ".", "tag": ".", "dep": "punct", "up": 1, "dn": []}]}]}, "reply-to": "L984", "timestamp": null, "vectors": []}\n'
b'{"id": "L984", "conversation_id": "L984", "text": "She okay?", "speaker": "u2", "meta": {"movie_id": "m0", "parsed": [{"rt": 1, "toks": [{"tok": "She", "tag": "PRP", "dep": "nsubj", "up": 1, "dn": []}, {"tok": "okay", "tag": "RB", "dep": "ROOT", "dn": [0, 2]}, {"tok": "?", "tag": ".", "dep": "punct", "up": 1, "dn": []}]}]}, "reply-to": null, "timestamp": null, "vectors": []}\n'
b'{"id": "L925", "conversation_id": "L924", "text": "Let\'s go.", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 0, "toks": [{"tok": "Let", "tag": "VB", "dep": "ROOT", "dn": [2, 3]}, {"tok": "\'s", "tag": "PRP", "dep": "nsubj", "up": 2, "dn": []}, {"tok": "go", "tag": "VB", "dep": "ccomp", "up": 0, "dn": [1]}, {"tok": ".", "tag": ".", "dep": "punct", "up": 0, "dn": []}]}]}, "reply-to": "L924", "timestamp": null, "vectors": []}\n'
b'{"id": "L924", "conversation_id": "L924", "text": "Wow", "speaker": "u2", "meta": {"movie_id": "m0", "parsed": [{"rt": 0, "toks": [{"tok": "Wow", "tag": "UH", "dep": "ROOT", "dn": []}]}]}, "reply-to": null, "timestamp": null, "vectors": []}\n'
b'{"id": "L872", "conversation_id": "L870", "text": "Okay -- you\'re gonna need to learn how to lie.", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 4, "toks": [{"tok": "Okay", "tag": "UH", "dep": "intj", "up": 4, "dn": []}, {"tok": "--", "tag": ":", "dep": "punct", "up": 4, "dn": []}, {"tok": "you", "tag": "PRP", "dep": "nsubj", "up": 4, "dn": []}, {"tok": "\'re", "tag": "VBP", "dep": "aux", "up": 4, "dn": []}, {"tok": "gon", "tag": "VBG", "dep": "ROOT", "dn": [0, 1, 2, 3, 6, 12]}, {"tok": "na", "tag": "TO", "dep": "aux", "up": 6, "dn": []}, {"tok": "need", "tag": "VB", "dep": "xcomp", "up": 4, "dn": [5, 8]}, {"tok": "to", "tag": "TO", "dep": "aux", "up": 8, "dn": []}, {"tok": "learn", "tag": "VB", "dep": "xcomp", "up": 6, "dn": [7, 11]}, {"tok": "how", "tag": "WRB", "dep": "advmod", "up": 11, "dn": []}, {"tok": "to", "tag": "TO", "dep": "aux", "up": 11, "dn": []}, {"tok": "lie", "tag": "VB", "dep": "xcomp", "up": 8, "dn": [9, 10]}, {"tok": ".", "tag": ".", "dep": "punct", "up": 4, "dn": []}]}]}, "reply-to": "L871", "timestamp": null, "vectors": []}\n'
b'{"id": "L871", "conversation_id": "L870", "text": "No", "speaker": "u2", "meta": {"movie_id": "m0", "parsed": [{"rt": 0, "toks": [{"tok": "No", "tag": "UH", "dep": "ROOT", "dn": []}]}]}, "reply-to": "L870", "timestamp": null, "vectors": []}\n'
b'{"id": "L870", "conversation_id": "L870", "text": "I\'m kidding.  You know how sometimes you just become this \\"persona\\"?  And you don\'t know how to quit?", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 2, "toks": [{"tok": "I", "tag": "PRP", "dep": "nsubj", "up": 2, "dn": []}, {"tok": "\'m", "tag": "VBP", "dep": "aux", "up": 2, "dn": []}, {"tok": "kidding", "tag": "VBG", "dep": "ROOT", "dn": [0, 1, 3]}, {"tok": ".", "tag": ".", "dep": "punct", "up": 2, "dn": [4]}, {"tok": " ", "tag": "_SP", "dep": "", "up": 3, "dn": []}]}, {"rt": 1, "toks": [{"tok": "You", "tag": "PRP", "dep": "nsubj", "up": 1, "dn": []}, {"tok": "know", "tag": "VBP", "dep": "ROOT", "dn": [0, 6, 11]}, {"tok": "how", "tag": "WRB", "dep": "advmod", "up": 3, "dn": []}, {"tok": "sometimes", "tag": "RB", "dep": "advmod", "up": 6, "dn": [2]}, {"tok": "you", "tag": "PRP", "dep": "nsubj", "up": 6, "dn": []}, {"tok": "just", "tag": "RB", "dep": "advmod", "up": 6, "dn": []}, {"tok": "become", "tag": "VBP", "dep": "ccomp", "up": 1, "dn": [3, 4, 5, 9]}, {"tok": "this", "tag": "DT", "dep": "det", "up": 9, "dn": []}, {"tok": "\\"", "tag": "``", "dep": "punct", "up": 9, "dn": []}, {"tok": "persona", "tag": "NN", "dep": "attr", "up": 6, "dn": [7, 8, 10]}, {"tok": "\\"", "tag": "\'\'", "dep": "punct", "up": 9, "dn": []}, {"tok": "?", "tag": ".", "dep": "punct", "up": 1, "dn": [12]}, {"tok": " ", "tag": "_SP", "dep": "", "up": 11, "dn": []}]}, {"rt": 4, "toks": [{"tok": "And", "tag": "CC", "dep": "cc", "up": 4, "dn": []}, {"tok": "you", "tag": "PRP", "dep": "nsubj", "up": 4, "dn": []}, {"tok": "do", "tag": "VBP", "dep": "aux", "up": 4, "dn": []}, {"tok": "n\'t", "tag": "RB", "dep": "neg", "up": 4, "dn": []}, {"tok": "know", "tag": "VB", "dep": "ROOT", "dn": [0, 1, 2, 3, 7, 8]}, {"tok": "how", "tag": "WRB", "dep": "advmod", "up": 7, "dn": []}, {"tok": "to", "tag": "TO", "dep": "aux", "up": 7, "dn": []}, {"tok": "quit", "tag": "VB", "dep": "xcomp", "up": 4, "dn": [5, 6]}, {"tok": "?", "tag": ".", "dep": "punct", "up": 4, "dn": []}]}]}, "reply-to": null, "timestamp": null, "vectors": []}\n'
b'{"id": "L869", "conversation_id": "L866", "text": "Like my fear of wearing pastels?", "speaker": "u0", "meta": {"movie_id": "m0", "parsed": [{"rt": 0, "toks": [{"tok": "Like", "tag": "IN", "dep": "ROOT", "dn": [2, 6]}, {"tok": "my", "tag": "PRP$", "dep": "poss", "up": 2, "dn": []}, {"tok": "fear", "tag": "NN", "dep": "pobj", "up": 0, "dn": [1, 3]}, {"tok": "of", "tag": "IN", "dep": "prep", "up": 2, "dn": [4]}, {"tok": "wearing", "tag": "VBG", "dep": "pcomp", "up": 3, "dn": [5]}, {"tok": "pastels", "tag": "NNS", "dep": "dobj", "up": 4, "dn": []}, {"tok": "?", "tag": ".", "dep": "punct", "up": 0, "dn": []}]}]}, "reply-to": "L868", "timestamp": null, "vectors": []}\n'

创建格式化数据文件

为了方便起见，我们将创建一个格式良好的数据文件，其中每一行包含一个用制表符分隔的查询句子和响应句子对。

以下函数有助于解析原始的 utterances.jsonl 数据文件。

• loadLinesAndConversations 将文件的每一行拆分成一个包含字段 lineID, characterID 和 text 的行字典，然后将它们按字段 conversationID, movieID 和 lines 分组到对话中。

• extractSentencePairs 从对话中提取句子对

# Splits each line of the file to create lines and conversations
def loadLinesAndConversations(fileName):
    lines = {}
    conversations = {}
    with open(fileName, 'r', encoding='iso-8859-1') as f:
        for line in f:
            lineJson = json.loads(line)
            # Extract fields for line object
            lineObj = {}
            lineObj["lineID"] = lineJson["id"]
            lineObj["characterID"] = lineJson["speaker"]
            lineObj["text"] = lineJson["text"]
            lines[lineObj['lineID']] = lineObj

            # Extract fields for conversation object
            if lineJson["conversation_id"] not in conversations:
                convObj = {}
                convObj["conversationID"] = lineJson["conversation_id"]
                convObj["movieID"] = lineJson["meta"]["movie_id"]
                convObj["lines"] = [lineObj]
            else:
                convObj = conversations[lineJson["conversation_id"]]
                convObj["lines"].insert(0, lineObj)
            conversations[convObj["conversationID"]] = convObj

    return lines, conversations


# Extracts pairs of sentences from conversations
def extractSentencePairs(conversations):
    qa_pairs = []
    for conversation in conversations.values():
        # Iterate over all the lines of the conversation
        for i in range(len(conversation["lines"]) - 1):  # We ignore the last line (no answer for it)
            inputLine = conversation["lines"][i]["text"].strip()
            targetLine = conversation["lines"][i+1]["text"].strip()
            # Filter wrong samples (if one of the lists is empty)
            if inputLine and targetLine:
                qa_pairs.append([inputLine, targetLine])
    return qa_pairs

现在我们将调用这些函数并创建文件。我们将它命名为 formatted_movie_lines.txt。

# Define path to new file
datafile = os.path.join(corpus, "formatted_movie_lines.txt")

delimiter = '\t'
# Unescape the delimiter
delimiter = str(codecs.decode(delimiter, "unicode_escape"))

# Initialize lines dict and conversations dict
lines = {}
conversations = {}
# Load lines and conversations
print("\nProcessing corpus into lines and conversations...")
lines, conversations = loadLinesAndConversations(os.path.join(corpus, "utterances.jsonl"))

# Write new csv file
print("\nWriting newly formatted file...")
with open(datafile, 'w', encoding='utf-8') as outputfile:
    writer = csv.writer(outputfile, delimiter=delimiter, lineterminator='\n')
    for pair in extractSentencePairs(conversations):
        writer.writerow(pair)

# Print a sample of lines
print("\nSample lines from file:")
printLines(datafile)

Processing corpus into lines and conversations...

Writing newly formatted file...

Sample lines from file:
b'They do to!\tThey do not!\n'
b'She okay?\tI hope so.\n'
b"Wow\tLet's go.\n"
b'"I\'m kidding.  You know how sometimes you just become this ""persona""?  And you don\'t know how to quit?"\tNo\n'
b"No\tOkay -- you're gonna need to learn how to lie.\n"
b"I figured you'd get to the good stuff eventually.\tWhat good stuff?\n"
b'What good stuff?\t"The ""real you""."\n'
b'"The ""real you""."\tLike my fear of wearing pastels?\n'
b'do you listen to this crap?\tWhat crap?\n'
b"What crap?\tMe.  This endless ...blonde babble. I'm like, boring myself.\n"

加载和修剪数据

下一步是创建一个词汇表，并将查询/响应句子对加载到内存中。

请注意，我们处理的是词语序列，它们没有隐式映射到离散的数值空间。因此，我们必须通过将数据集中遇到的每个唯一词映射到索引值来创建一个数值空间。

为此，我们定义了一个 Voc 类，它维护一个从词到索引的映射，一个从索引到词的反向映射，每个词的计数以及总词数。该类提供了将词添加到词汇表（addWord）、添加句子中的所有词（addSentence）和修剪不常出现的词（trim）的方法。稍后将详细介绍修剪。

# Default word tokens
PAD_token = 0  # Used for padding short sentences
SOS_token = 1  # Start-of-sentence token
EOS_token = 2  # End-of-sentence token

class Voc:
    def __init__(self, name):
        self.name = name
        self.trimmed = False
        self.word2index = {}
        self.word2count = {}
        self.index2word = {PAD_token: "PAD", SOS_token: "SOS", EOS_token: "EOS"}
        self.num_words = 3  # Count SOS, EOS, PAD

    def addSentence(self, sentence):
        for word in sentence.split(' '):
            self.addWord(word)

    def addWord(self, word):
        if word not in self.word2index:
            self.word2index[word] = self.num_words
            self.word2count[word] = 1
            self.index2word[self.num_words] = word
            self.num_words += 1
        else:
            self.word2count[word] += 1

    # Remove words below a certain count threshold
    def trim(self, min_count):
        if self.trimmed:
            return
        self.trimmed = True

        keep_words = []

        for k, v in self.word2count.items():
            if v >= min_count:
                keep_words.append(k)

        print('keep_words {} / {} = {:.4f}'.format(
            len(keep_words), len(self.word2index), len(keep_words) / len(self.word2index)
        ))

        # Reinitialize dictionaries
        self.word2index = {}
        self.word2count = {}
        self.index2word = {PAD_token: "PAD", SOS_token: "SOS", EOS_token: "EOS"}
        self.num_words = 3 # Count default tokens

        for word in keep_words:
            self.addWord(word)

现在我们可以组装我们的词汇表和查询/响应句子对。在准备使用这些数据之前，我们必须进行一些预处理。

首先，我们必须使用 unicodeToAscii 将 Unicode 字符串转换为 ASCII。接下来，我们将所有字母转换为小写，并修剪除基本标点符号外的所有非字母字符（normalizeString）。最后，为了帮助训练收敛，我们将过滤掉长度超过 MAX_LENGTH 阈值的句子（filterPairs）。

MAX_LENGTH = 10  # Maximum sentence length to consider

# Turn a Unicode string to plain ASCII, thanks to
# https://stackoverflow.com/a/518232/2809427
def unicodeToAscii(s):
    return ''.join(
        c for c in unicodedata.normalize('NFD', s)
        if unicodedata.category(c) != 'Mn'
    )

# Lowercase, trim, and remove non-letter characters
def normalizeString(s):
    s = unicodeToAscii(s.lower().strip())
    s = re.sub(r"([.!?])", r" \1", s)
    s = re.sub(r"[^a-zA-Z.!?]+", r" ", s)
    s = re.sub(r"\s+", r" ", s).strip()
    return s

# Read query/response pairs and return a voc object
def readVocs(datafile, corpus_name):
    print("Reading lines...")
    # Read the file and split into lines
    lines = open(datafile, encoding='utf-8').\
        read().strip().split('\n')
    # Split every line into pairs and normalize
    pairs = [[normalizeString(s) for s in l.split('\t')] for l in lines]
    voc = Voc(corpus_name)
    return voc, pairs

# Returns True if both sentences in a pair 'p' are under the MAX_LENGTH threshold
def filterPair(p):
    # Input sequences need to preserve the last word for EOS token
    return len(p[0].split(' ')) < MAX_LENGTH and len(p[1].split(' ')) < MAX_LENGTH

# Filter pairs using the ``filterPair`` condition
def filterPairs(pairs):
    return [pair for pair in pairs if filterPair(pair)]

# Using the functions defined above, return a populated voc object and pairs list
def loadPrepareData(corpus, corpus_name, datafile, save_dir):
    print("Start preparing training data ...")
    voc, pairs = readVocs(datafile, corpus_name)
    print("Read {!s} sentence pairs".format(len(pairs)))
    pairs = filterPairs(pairs)
    print("Trimmed to {!s} sentence pairs".format(len(pairs)))
    print("Counting words...")
    for pair in pairs:
        voc.addSentence(pair[0])
        voc.addSentence(pair[1])
    print("Counted words:", voc.num_words)
    return voc, pairs


# Load/Assemble voc and pairs
save_dir = os.path.join("data", "save")
voc, pairs = loadPrepareData(corpus, corpus_name, datafile, save_dir)
# Print some pairs to validate
print("\npairs:")
for pair in pairs[:10]:
    print(pair)

Start preparing training data ...
Reading lines...
Read 221282 sentence pairs
Trimmed to 64313 sentence pairs
Counting words...
Counted words: 18082

pairs:
['they do to !', 'they do not !']
['she okay ?', 'i hope so .']
['wow', 'let s go .']
['what good stuff ?', 'the real you .']
['the real you .', 'like my fear of wearing pastels ?']
['do you listen to this crap ?', 'what crap ?']
['well no . . .', 'then that s all you had to say .']
['then that s all you had to say .', 'but']
['but', 'you always been this selfish ?']
['have fun tonight ?', 'tons']

另一种有助于在训练期间更快收敛的策略是修剪词汇表中很少使用的词。减小特征空间也将降低模型必须学习逼近的函数的难度。我们将通过两步完成此操作

1. 使用 voc.trim 函数修剪使用次数低于 MIN_COUNT 阈值的词。

2. 过滤掉包含已修剪词语的句子对。

MIN_COUNT = 3    # Minimum word count threshold for trimming

def trimRareWords(voc, pairs, MIN_COUNT):
    # Trim words used under the MIN_COUNT from the voc
    voc.trim(MIN_COUNT)
    # Filter out pairs with trimmed words
    keep_pairs = []
    for pair in pairs:
        input_sentence = pair[0]
        output_sentence = pair[1]
        keep_input = True
        keep_output = True
        # Check input sentence
        for word in input_sentence.split(' '):
            if word not in voc.word2index:
                keep_input = False
                break
        # Check output sentence
        for word in output_sentence.split(' '):
            if word not in voc.word2index:
                keep_output = False
                break

        # Only keep pairs that do not contain trimmed word(s) in their input or output sentence
        if keep_input and keep_output:
            keep_pairs.append(pair)

    print("Trimmed from {} pairs to {}, {:.4f} of total".format(len(pairs), len(keep_pairs), len(keep_pairs) / len(pairs)))
    return keep_pairs


# Trim voc and pairs
pairs = trimRareWords(voc, pairs, MIN_COUNT)

keep_words 7833 / 18079 = 0.4333
Trimmed from 64313 pairs to 53131, 0.8261 of total

为模型准备数据

尽管我们已经付出了很多努力来准备和整理数据，将其放入一个很好的词汇表对象和句子对列表中，但我们的模型最终期望将数值型的 torch 张量作为输入。为模型准备处理好的数据的一种方法可以在seq2seq 翻译教程中找到。在该教程中，我们使用的批量大小为 1，这意味着我们只需将句子对中的词语转换为它们在词汇表中对应的索引，然后将其输入到模型中。

但是，如果您想加快训练速度和/或希望利用 GPU 并行化能力，您将需要使用小批量（mini-batches）进行训练。

使用小批量（mini-batches）也意味着我们必须注意批次中句子长度的变化。为了在同一批次中适应不同大小的句子，我们将批量输入的张量形状设为 (max_length, batch_size)，其中长度小于 max_length 的句子在 EOS_token 之后进行零填充。

如果我们简单地将英语句子通过将词语转换为索引（indexesFromSentence）并进行零填充来转换为张量，我们的张量形状将是 (batch_size, max_length)，并且对第一维进行索引将返回跨所有时间步的完整序列。然而，我们需要能够沿着时间步和跨批次中的所有序列对批次进行索引。因此，我们将输入批次的形状转置为 (max_length, batch_size)，这样对第一维进行索引将返回跨批次中所有句子的一个时间步。我们在 zeroPadding 函数中隐式处理了这个转置。

The inputVar 函数处理将句子转换为张量的过程，最终创建一个形状正确的零填充张量。它还返回批次中每个序列的 lengths 张量，该张量稍后将传递给我们的解码器。

The outputVar 函数执行与 inputVar 类似的功能，但它不返回 lengths 张量，而是返回一个二进制掩码张量和一个最大目标句子长度。二进制掩码张量与输出目标张量具有相同的形状，但是所有是 PAD_token 的元素都是 0，而其他元素都是 1。

batch2TrainData 简单地接受一组句子对，并使用上述函数返回输入和目标张量。

def indexesFromSentence(voc, sentence):
    return [voc.word2index[word] for word in sentence.split(' ')] + [EOS_token]


def zeroPadding(l, fillvalue=PAD_token):
    return list(itertools.zip_longest(*l, fillvalue=fillvalue))

def binaryMatrix(l, value=PAD_token):
    m = []
    for i, seq in enumerate(l):
        m.append([])
        for token in seq:
            if token == PAD_token:
                m[i].append(0)
            else:
                m[i].append(1)
    return m

# Returns padded input sequence tensor and lengths
def inputVar(l, voc):
    indexes_batch = [indexesFromSentence(voc, sentence) for sentence in l]
    lengths = torch.tensor([len(indexes) for indexes in indexes_batch])
    padList = zeroPadding(indexes_batch)
    padVar = torch.LongTensor(padList)
    return padVar, lengths

# Returns padded target sequence tensor, padding mask, and max target length
def outputVar(l, voc):
    indexes_batch = [indexesFromSentence(voc, sentence) for sentence in l]
    max_target_len = max([len(indexes) for indexes in indexes_batch])
    padList = zeroPadding(indexes_batch)
    mask = binaryMatrix(padList)
    mask = torch.BoolTensor(mask)
    padVar = torch.LongTensor(padList)
    return padVar, mask, max_target_len

# Returns all items for a given batch of pairs
def batch2TrainData(voc, pair_batch):
    pair_batch.sort(key=lambda x: len(x[0].split(" ")), reverse=True)
    input_batch, output_batch = [], []
    for pair in pair_batch:
        input_batch.append(pair[0])
        output_batch.append(pair[1])
    inp, lengths = inputVar(input_batch, voc)
    output, mask, max_target_len = outputVar(output_batch, voc)
    return inp, lengths, output, mask, max_target_len


# Example for validation
small_batch_size = 5
batches = batch2TrainData(voc, [random.choice(pairs) for _ in range(small_batch_size)])
input_variable, lengths, target_variable, mask, max_target_len = batches

print("input_variable:", input_variable)
print("lengths:", lengths)
print("target_variable:", target_variable)
print("mask:", mask)
print("max_target_len:", max_target_len)

input_variable: tensor([[  86,   24,  140,  829,   62],
        [   6,  355, 1362,  206,  566],
        [  36,  735,   14,   72, 1919],
        [  17,  140,  140, 2160,   85],
        [  62,   28,  158,   14,   14],
        [1012,  461,  140,    2,    2],
        [3223,   10,   14,    0,    0],
        [1012,    2,    2,    0,    0],
        [   6,    0,    0,    0,    0],
        [   2,    0,    0,    0,    0]])
lengths: tensor([10,  8,  8,  6,  6])
target_variable: tensor([[  18,   11,  101,   93,  277],
        [ 483,  113,   19,  311,   72],
        [   5,  241,   10,   72,   10],
        [  22,  706,    2,   19,    2],
        [2010,   14,    0,   24,    0],
        [1556,    2,    0,  136,    0],
        [  14,    0,    0,    5,    0],
        [   2,    0,    0,   48,    0],
        [   0,    0,    0,   14,    0],
        [   0,    0,    0,    2,    0]])
mask: tensor([[ True,  True,  True,  True,  True],
        [ True,  True,  True,  True,  True],
        [ True,  True,  True,  True,  True],
        [ True,  True,  True,  True,  True],
        [ True,  True, False,  True, False],
        [ True,  True, False,  True, False],
        [ True, False, False,  True, False],
        [ True, False, False,  True, False],
        [False, False, False,  True, False],
        [False, False, False,  True, False]])
max_target_len: 10

定义模型

Seq2Seq 模型

我们的聊天机器人的核心是一个序列到序列 (seq2seq) 模型。seq2seq 模型的目标是接收一个可变长度的序列作为输入，并使用一个固定大小的模型返回一个可变长度的序列作为输出。

Sutskever 等人发现，通过将两个独立的循环神经网络（RNN）结合起来使用，我们可以完成这项任务。其中一个 RNN 充当编码器，它将可变长度的输入序列编码为固定长度的上下文向量。理论上，这个上下文向量（RNN 的最终隐藏层）将包含输入到机器人中的查询句子的语义信息。第二个 RNN 是一个解码器，它接收一个输入词和上下文向量，并返回对序列中下一个词的猜测以及在下一次迭代中使用的隐藏状态。

图片来源：https://jeddy92.github.io/JEddy92.github.io/ts_seq2seq_intro/

编码器

编码器 RNN 逐个时间步（例如，词）迭代输入句子，在每个时间步输出一个“输出”向量和一个“隐藏状态”向量。然后将隐藏状态向量传递到下一个时间步，同时记录输出向量。编码器将它在序列中每个点看到的上下文转换为高维空间中的一组点，解码器将使用这些点为给定任务生成有意义的输出。

我们的编码器的核心是一个多层门控循环单元（Gated Recurrent Unit，GRU），由Cho 等人在 2014 年发明。我们将使用 GRU 的双向变体，这意味着本质上有两个独立的 RNN：一个以正常顺序馈送输入序列，另一个以反向顺序馈送输入序列。每个网络的输出在每个时间步相加。使用双向 GRU 将使我们能够同时编码过去和未来的上下文。

双向 RNN

图片来源：https://colah.github.io/posts/2015-09-NN-Types-FP/

请注意，使用了一个 embedding 层来将我们的词索引编码到任意大小的特征空间中。对于我们的模型，该层将每个词映射到一个大小为 hidden_size 的特征空间。训练后，这些值应编码具有相似含义的词之间的语义相似性。

最后，如果将填充后的序列批量传递给 RNN 模块，我们必须在 RNN 传递前后使用 nn.utils.rnn.pack_padded_sequence 和 nn.utils.rnn.pad_packed_sequence 分别打包和解包填充。

计算图

1. 将词索引转换为嵌入。

2. 为 RNN 模块打包填充后的序列批次。

3. 通过 GRU 进行前向传播。

4. 解包填充。

5. 对双向 GRU 输出求和。

6. 返回输出和最终隐藏状态。

输入

• input_seq: 输入句子批次；形状=(max_length, batch_size)

• input_lengths: 批次中每个句子对应的长度列表；形状=(batch_size)

• hidden: 隐藏状态；形状=(n_layers x num_directions, batch_size, hidden_size)

输出

• outputs: GRU 最后一层隐藏层的输出特征（双向输出之和）；形状=(max_length, batch_size, hidden_size)

• hidden: GRU 更新后的隐藏状态；形状=(n_layers x num_directions, batch_size, hidden_size)

class EncoderRNN(nn.Module):
    def __init__(self, hidden_size, embedding, n_layers=1, dropout=0):
        super(EncoderRNN, self).__init__()
        self.n_layers = n_layers
        self.hidden_size = hidden_size
        self.embedding = embedding

        # Initialize GRU; the input_size and hidden_size parameters are both set to 'hidden_size'
        #   because our input size is a word embedding with number of features == hidden_size
        self.gru = nn.GRU(hidden_size, hidden_size, n_layers,
                          dropout=(0 if n_layers == 1 else dropout), bidirectional=True)

    def forward(self, input_seq, input_lengths, hidden=None):
        # Convert word indexes to embeddings
        embedded = self.embedding(input_seq)
        # Pack padded batch of sequences for RNN module
        packed = nn.utils.rnn.pack_padded_sequence(embedded, input_lengths)
        # Forward pass through GRU
        outputs, hidden = self.gru(packed, hidden)
        # Unpack padding
        outputs, _ = nn.utils.rnn.pad_packed_sequence(outputs)
        # Sum bidirectional GRU outputs
        outputs = outputs[:, :, :self.hidden_size] + outputs[:, : ,self.hidden_size:]
        # Return output and final hidden state
        return outputs, hidden

解码器

解码器 RNN 以逐词的方式生成响应句子。它使用编码器的上下文向量和内部隐藏状态来生成序列中的下一个词。它继续生成词，直到输出一个 EOS_token，表示句子结束。香草（vanilla）seq2seq 解码器的一个常见问题是，如果完全依赖上下文向量来编码整个输入序列的含义，很可能会发生信息丢失。在处理长输入序列时尤其如此，这极大地限制了解码器的能力。

为了解决这个问题，Bahdanau 等人创建了一种“注意力机制”，它允许解码器关注输入序列的某些部分，而不是在每个步骤都使用整个固定上下文。

从高层次上看，注意力是使用解码器当前的隐藏状态和编码器的输出计算的。输出注意力权重与输入序列形状相同，我们可以将它们乘以编码器输出，得到一个加权和，它指示编码器输出中应该关注的部分。Sean Robertson 的图很好地描述了这一点

Luong 等人在 Bahdanau 等人的基础上改进，创建了“全局注意力”（Global attention）。主要区别在于，“全局注意力”考虑编码器的所有隐藏状态，而不是像 Bahdanau 等人的“局部注意力”（Local attention）那样只考虑当前时间步的编码器隐藏状态。另一个区别是，“全局注意力”仅使用解码器当前时间步的隐藏状态来计算注意力权重或能量。Bahdanau 等人的注意力计算需要知道解码器在前一时间步的状态。此外，Luong 等人 提供了各种计算编码器输出和解码器输出之间注意力能量的方法，这些方法被称为“评分函数”（score functions）

其中 \(h_t\) = 当前目标解码器状态，\(\bar{h}_s\) = 所有编码器状态。

总的来说，全局注意力机制可以用下图概括。请注意，我们将“注意力层”（Attention Layer）实现为一个单独的 nn.Module，名为 Attn。该模块的输出是一个经过 softmax 归一化的权重张量，形状为 (batch_size, 1, max_length)。

# Luong attention layer
class Attn(nn.Module):
    def __init__(self, method, hidden_size):
        super(Attn, self).__init__()
        self.method = method
        if self.method not in ['dot', 'general', 'concat']:
            raise ValueError(self.method, "is not an appropriate attention method.")
        self.hidden_size = hidden_size
        if self.method == 'general':
            self.attn = nn.Linear(self.hidden_size, hidden_size)
        elif self.method == 'concat':
            self.attn = nn.Linear(self.hidden_size * 2, hidden_size)
            self.v = nn.Parameter(torch.FloatTensor(hidden_size))

    def dot_score(self, hidden, encoder_output):
        return torch.sum(hidden * encoder_output, dim=2)

    def general_score(self, hidden, encoder_output):
        energy = self.attn(encoder_output)
        return torch.sum(hidden * energy, dim=2)

    def concat_score(self, hidden, encoder_output):
        energy = self.attn(torch.cat((hidden.expand(encoder_output.size(0), -1, -1), encoder_output), 2)).tanh()
        return torch.sum(self.v * energy, dim=2)

    def forward(self, hidden, encoder_outputs):
        # Calculate the attention weights (energies) based on the given method
        if self.method == 'general':
            attn_energies = self.general_score(hidden, encoder_outputs)
        elif self.method == 'concat':
            attn_energies = self.concat_score(hidden, encoder_outputs)
        elif self.method == 'dot':
            attn_energies = self.dot_score(hidden, encoder_outputs)

        # Transpose max_length and batch_size dimensions
        attn_energies = attn_energies.t()

        # Return the softmax normalized probability scores (with added dimension)
        return F.softmax(attn_energies, dim=1).unsqueeze(1)

既然我们已经定义了注意力子模块，就可以实现实际的解码器模型了。对于解码器，我们将手动地一次馈送批次中的一个时间步。这意味着我们的嵌入词张量和 GRU 输出都将具有形状 (1, batch_size, hidden_size)。

计算图

1. 获取当前输入词的嵌入。

2. 通过单向 GRU 进行前向传播。

3. 从 (2) 中的当前 GRU 输出计算注意力权重。

4. 将注意力权重乘以编码器输出，得到新的“加权和”上下文向量。

5. 使用 Luong 方程 5 拼接加权上下文向量和 GRU 输出。

6. 使用 Luong 方程 6 预测下一个词（不含 softmax）。

7. 返回输出和最终隐藏状态。

输入

• input_step: 输入序列批次中的一个时间步（一个词）；形状=(1, batch_size)

• last_hidden: GRU 的最终隐藏层；形状=(n_layers x num_directions, batch_size, hidden_size)

• encoder_outputs: 编码器模型的输出；形状=(max_length, batch_size, hidden_size)

输出

• output: 经过 softmax 归一化的张量，给出解码序列中每个词成为正确下一个词的概率；形状=(batch_size, voc.num_words)

• hidden: GRU 的最终隐藏状态；形状=(n_layers x num_directions, batch_size, hidden_size)

class LuongAttnDecoderRNN(nn.Module):
    def __init__(self, attn_model, embedding, hidden_size, output_size, n_layers=1, dropout=0.1):
        super(LuongAttnDecoderRNN, self).__init__()

        # Keep for reference
        self.attn_model = attn_model
        self.hidden_size = hidden_size
        self.output_size = output_size
        self.n_layers = n_layers
        self.dropout = dropout

        # Define layers
        self.embedding = embedding
        self.embedding_dropout = nn.Dropout(dropout)
        self.gru = nn.GRU(hidden_size, hidden_size, n_layers, dropout=(0 if n_layers == 1 else dropout))
        self.concat = nn.Linear(hidden_size * 2, hidden_size)
        self.out = nn.Linear(hidden_size, output_size)

        self.attn = Attn(attn_model, hidden_size)

    def forward(self, input_step, last_hidden, encoder_outputs):
        # Note: we run this one step (word) at a time
        # Get embedding of current input word
        embedded = self.embedding(input_step)
        embedded = self.embedding_dropout(embedded)
        # Forward through unidirectional GRU
        rnn_output, hidden = self.gru(embedded, last_hidden)
        # Calculate attention weights from the current GRU output
        attn_weights = self.attn(rnn_output, encoder_outputs)
        # Multiply attention weights to encoder outputs to get new "weighted sum" context vector
        context = attn_weights.bmm(encoder_outputs.transpose(0, 1))
        # Concatenate weighted context vector and GRU output using Luong eq. 5
        rnn_output = rnn_output.squeeze(0)
        context = context.squeeze(1)
        concat_input = torch.cat((rnn_output, context), 1)
        concat_output = torch.tanh(self.concat(concat_input))
        # Predict next word using Luong eq. 6
        output = self.out(concat_output)
        output = F.softmax(output, dim=1)
        # Return output and final hidden state
        return output, hidden

定义训练过程

掩码损失

由于我们处理的是填充序列的批次，在计算损失时不能简单地考虑张量的所有元素。我们定义 maskNLLLoss，根据解码器的输出张量、目标张量以及描述目标张量填充情况的二进制掩码张量来计算损失。这个损失函数计算掩码张量中对应于 1 的元素的平均负对数似然。

def maskNLLLoss(inp, target, mask):
    nTotal = mask.sum()
    crossEntropy = -torch.log(torch.gather(inp, 1, target.view(-1, 1)).squeeze(1))
    loss = crossEntropy.masked_select(mask).mean()
    loss = loss.to(device)
    return loss, nTotal.item()

单次训练迭代

The train 函数包含单次训练迭代（单个输入批次）的算法。

我们将使用一些巧妙的技巧来帮助收敛

• 第一个技巧是使用教师强制（teacher forcing）。这意味着以 teacher_forcing_ratio 设置的某个概率，我们使用当前目标词作为解码器的下一个输入，而不是使用解码器当前的猜测。这项技术就像解码器的训练轮，有助于提高训练效率。然而，教师强制可能导致推理期间的模型不稳定，因为解码器在训练期间可能没有足够的机会真正生成自己的输出序列。因此，我们必须谨慎设置 teacher_forcing_ratio，并且不要被快速收敛所迷惑。

• 我们实现的第二个技巧是梯度裁剪（gradient clipping）。这是应对“梯度爆炸”问题常用的技术。本质上，通过将梯度裁剪或阈值化到一个最大值，我们可以防止梯度呈指数增长并导致溢出 (NaN) 或在成本函数中越过陡峭的悬崖。

图片来源：Goodfellow 等人. Deep Learning. 2016. https://www.deeplearningbook.org/

操作顺序

1. 将整个输入批次前向传播通过编码器。

2. 将解码器输入初始化为 SOS_token，将隐藏状态初始化为编码器的最终隐藏状态。

3. 将输入批次序列一次一个时间步地前向传播通过解码器。

4. 如果使用教师强制：将下一个解码器输入设置为当前目标；否则：将下一个解码器输入设置为当前解码器输出。

5. 计算并累积损失。

6. 执行反向传播。

7. 裁剪梯度。

8. 更新编码器和解码器模型参数。

注意

PyTorch 的 RNN 模块（RNN, LSTM, GRU）可以像任何其他非循环层一样使用，只需将整个输入序列（或序列批次）传递给它们即可。我们在 encoder 中就是这样使用 GRU 层的。实际上，在其内部有一个迭代过程，循环处理每个时间步并计算隐藏状态。或者，您可以一次一个时间步地运行这些模块。在这种情况下，我们在训练过程中手动循环处理序列，就像我们必须对 decoder 模型所做的那样。只要您对这些模块保持正确的概念模型，实现序列模型就非常简单了。

def train(input_variable, lengths, target_variable, mask, max_target_len, encoder, decoder, embedding,
          encoder_optimizer, decoder_optimizer, batch_size, clip, max_length=MAX_LENGTH):

    # Zero gradients
    encoder_optimizer.zero_grad()
    decoder_optimizer.zero_grad()

    # Set device options
    input_variable = input_variable.to(device)
    target_variable = target_variable.to(device)
    mask = mask.to(device)
    # Lengths for RNN packing should always be on the CPU
    lengths = lengths.to("cpu")

    # Initialize variables
    loss = 0
    print_losses = []
    n_totals = 0

    # Forward pass through encoder
    encoder_outputs, encoder_hidden = encoder(input_variable, lengths)

    # Create initial decoder input (start with SOS tokens for each sentence)
    decoder_input = torch.LongTensor([[SOS_token for _ in range(batch_size)]])
    decoder_input = decoder_input.to(device)

    # Set initial decoder hidden state to the encoder's final hidden state
    decoder_hidden = encoder_hidden[:decoder.n_layers]

    # Determine if we are using teacher forcing this iteration
    use_teacher_forcing = True if random.random() < teacher_forcing_ratio else False

    # Forward batch of sequences through decoder one time step at a time
    if use_teacher_forcing:
        for t in range(max_target_len):
            decoder_output, decoder_hidden = decoder(
                decoder_input, decoder_hidden, encoder_outputs
            )
            # Teacher forcing: next input is current target
            decoder_input = target_variable[t].view(1, -1)
            # Calculate and accumulate loss
            mask_loss, nTotal = maskNLLLoss(decoder_output, target_variable[t], mask[t])
            loss += mask_loss
            print_losses.append(mask_loss.item() * nTotal)
            n_totals += nTotal
    else:
        for t in range(max_target_len):
            decoder_output, decoder_hidden = decoder(
                decoder_input, decoder_hidden, encoder_outputs
            )
            # No teacher forcing: next input is decoder's own current output
            _, topi = decoder_output.topk(1)
            decoder_input = torch.LongTensor([[topi[i][0] for i in range(batch_size)]])
            decoder_input = decoder_input.to(device)
            # Calculate and accumulate loss
            mask_loss, nTotal = maskNLLLoss(decoder_output, target_variable[t], mask[t])
            loss += mask_loss
            print_losses.append(mask_loss.item() * nTotal)
            n_totals += nTotal

    # Perform backpropagation
    loss.backward()

    # Clip gradients: gradients are modified in place
    _ = nn.utils.clip_grad_norm_(encoder.parameters(), clip)
    _ = nn.utils.clip_grad_norm_(decoder.parameters(), clip)

    # Adjust model weights
    encoder_optimizer.step()
    decoder_optimizer.step()

    return sum(print_losses) / n_totals

训练迭代

现在终于可以将完整的训练过程与数据结合起来了。trainIters 函数负责根据传入的模型、优化器、数据等运行 n_iterations 次训练。这个函数相当不言自明，因为我们已经在 train 函数中完成了大部分工作。

有一点需要注意，当我们保存模型时，我们保存一个 tarball，其中包含编码器和解码器的 state_dicts（参数）、优化器的 state_dicts、损失、迭代次数等。以这种方式保存模型将为我们提供最大的检查点灵活性。加载检查点后，我们可以使用模型参数运行推理，或者我们可以从上次停止的地方继续训练。

def trainIters(model_name, voc, pairs, encoder, decoder, encoder_optimizer, decoder_optimizer, embedding, encoder_n_layers, decoder_n_layers, save_dir, n_iteration, batch_size, print_every, save_every, clip, corpus_name, loadFilename):

    # Load batches for each iteration
    training_batches = [batch2TrainData(voc, [random.choice(pairs) for _ in range(batch_size)])
                      for _ in range(n_iteration)]

    # Initializations
    print('Initializing ...')
    start_iteration = 1
    print_loss = 0
    if loadFilename:
        start_iteration = checkpoint['iteration'] + 1

    # Training loop
    print("Training...")
    for iteration in range(start_iteration, n_iteration + 1):
        training_batch = training_batches[iteration - 1]
        # Extract fields from batch
        input_variable, lengths, target_variable, mask, max_target_len = training_batch

        # Run a training iteration with batch
        loss = train(input_variable, lengths, target_variable, mask, max_target_len, encoder,
                     decoder, embedding, encoder_optimizer, decoder_optimizer, batch_size, clip)
        print_loss += loss

        # Print progress
        if iteration % print_every == 0:
            print_loss_avg = print_loss / print_every
            print("Iteration: {}; Percent complete: {:.1f}%; Average loss: {:.4f}".format(iteration, iteration / n_iteration * 100, print_loss_avg))
            print_loss = 0

        # Save checkpoint
        if (iteration % save_every == 0):
            directory = os.path.join(save_dir, model_name, corpus_name, '{}-{}_{}'.format(encoder_n_layers, decoder_n_layers, hidden_size))
            if not os.path.exists(directory):
                os.makedirs(directory)
            torch.save({
                'iteration': iteration,
                'en': encoder.state_dict(),
                'de': decoder.state_dict(),
                'en_opt': encoder_optimizer.state_dict(),
                'de_opt': decoder_optimizer.state_dict(),
                'loss': loss,
                'voc_dict': voc.__dict__,
                'embedding': embedding.state_dict()
            }, os.path.join(directory, '{}_{}.tar'.format(iteration, 'checkpoint')))

定义评估

训练模型后，我们希望能够自己与机器人对话。首先，我们必须定义模型如何解码编码后的输入。

贪婪解码

贪婪解码是我们训练期间不使用教师强制（teacher forcing）时使用的解码方法。换句话说，对于每个时间步，我们只从 decoder_output 中选择 softmax 值最高的词。这种解码方法在单时间步级别上是最优的。

为了方便进行贪婪解码操作，我们定义一个 GreedySearchDecoder 类。运行时，该类的对象接受一个形状为 (输入序列长度, 1) 的输入序列（input_seq）、一个标量输入长度（input_length）张量，以及一个用于限制响应句子长度的 max_length。输入句子使用以下计算图进行评估：

计算图

1. 将输入通过编码器模型向前传播。

2. 准备编码器的最终隐藏层，作为解码器的第一个隐藏输入。

3. 将解码器的第一个输入初始化为 SOS_token。

4. 初始化用于附加解码后的词的张量。

5. 迭代地一次解码一个词标记

   1. 通过解码器进行前向传播。

   2. 获取最可能的词标记及其 softmax 分数。

   3. 记录标记和分数。

   4. 准备当前标记作为下一个解码器输入。

6. 返回词标记和分数的集合。

class GreedySearchDecoder(nn.Module):
    def __init__(self, encoder, decoder):
        super(GreedySearchDecoder, self).__init__()
        self.encoder = encoder
        self.decoder = decoder

    def forward(self, input_seq, input_length, max_length):
        # Forward input through encoder model
        encoder_outputs, encoder_hidden = self.encoder(input_seq, input_length)
        # Prepare encoder's final hidden layer to be first hidden input to the decoder
        decoder_hidden = encoder_hidden[:self.decoder.n_layers]
        # Initialize decoder input with SOS_token
        decoder_input = torch.ones(1, 1, device=device, dtype=torch.long) * SOS_token
        # Initialize tensors to append decoded words to
        all_tokens = torch.zeros([0], device=device, dtype=torch.long)
        all_scores = torch.zeros([0], device=device)
        # Iteratively decode one word token at a time
        for _ in range(max_length):
            # Forward pass through decoder
            decoder_output, decoder_hidden = self.decoder(decoder_input, decoder_hidden, encoder_outputs)
            # Obtain most likely word token and its softmax score
            decoder_scores, decoder_input = torch.max(decoder_output, dim=1)
            # Record token and score
            all_tokens = torch.cat((all_tokens, decoder_input), dim=0)
            all_scores = torch.cat((all_scores, decoder_scores), dim=0)
            # Prepare current token to be next decoder input (add a dimension)
            decoder_input = torch.unsqueeze(decoder_input, 0)
        # Return collections of word tokens and scores
        return all_tokens, all_scores

评估我的文本

现在我们已经定义了解码方法，我们可以编写用于评估字符串输入句子的函数。 evaluate 函数管理处理输入句子的低层过程。我们首先将句子格式化为词索引的输入批次，其中 batch_size==1。我们通过将句子的词转换为对应的索引，并转置维度来完成此操作，以准备张量供模型使用。我们还创建一个 lengths 张量，其中包含输入句子的长度。在这种情况下，lengths 是标量，因为我们一次只评估一个句子（batch_size==1）。接下来，我们使用 GreedySearchDecoder 对象（searcher）获取解码后的响应句子张量。最后，我们将响应的索引转换为词，并返回解码后的词列表。

evaluateInput 用作我们聊天机器人的用户界面。调用时，会弹出一个输入文本字段，我们可以在其中输入查询句子。输入句子并按下 Enter 后，我们的文本会以与训练数据相同的方式进行归一化，并最终馈入 evaluate 函数以获取解码后的输出句子。我们将此过程循环，以便我们可以继续与机器人聊天，直到输入“q”或“quit”为止。

最后，如果输入的句子包含词汇表中不存在的词，我们会通过打印错误消息并提示用户输入另一个句子来优雅地处理这种情况。

def evaluate(encoder, decoder, searcher, voc, sentence, max_length=MAX_LENGTH):
    ### Format input sentence as a batch
    # words -> indexes
    indexes_batch = [indexesFromSentence(voc, sentence)]
    # Create lengths tensor
    lengths = torch.tensor([len(indexes) for indexes in indexes_batch])
    # Transpose dimensions of batch to match models' expectations
    input_batch = torch.LongTensor(indexes_batch).transpose(0, 1)
    # Use appropriate device
    input_batch = input_batch.to(device)
    lengths = lengths.to("cpu")
    # Decode sentence with searcher
    tokens, scores = searcher(input_batch, lengths, max_length)
    # indexes -> words
    decoded_words = [voc.index2word[token.item()] for token in tokens]
    return decoded_words


def evaluateInput(encoder, decoder, searcher, voc):
    input_sentence = ''
    while(1):
        try:
            # Get input sentence
            input_sentence = input('> ')
            # Check if it is quit case
            if input_sentence == 'q' or input_sentence == 'quit': break
            # Normalize sentence
            input_sentence = normalizeString(input_sentence)
            # Evaluate sentence
            output_words = evaluate(encoder, decoder, searcher, voc, input_sentence)
            # Format and print response sentence
            output_words[:] = [x for x in output_words if not (x == 'EOS' or x == 'PAD')]
            print('Bot:', ' '.join(output_words))

        except KeyError:
            print("Error: Encountered unknown word.")

运行模型

最后，是时候运行我们的模型了！

无论我们是想训练还是测试聊天机器人模型，都必须初始化独立的编码器和解码器模型。在下面的代码块中，我们设置所需的配置，选择从头开始或设置要加载的检查点，然后构建并初始化模型。可以随意尝试不同的模型配置以优化性能。

# Configure models
model_name = 'cb_model'
attn_model = 'dot'
#``attn_model = 'general'``
#``attn_model = 'concat'``
hidden_size = 500
encoder_n_layers = 2
decoder_n_layers = 2
dropout = 0.1
batch_size = 64

# Set checkpoint to load from; set to None if starting from scratch
loadFilename = None
checkpoint_iter = 4000

从检查点加载的示例代码

loadFilename = os.path.join(save_dir, model_name, corpus_name,
                    '{}-{}_{}'.format(encoder_n_layers, decoder_n_layers, hidden_size),
                    '{}_checkpoint.tar'.format(checkpoint_iter))

# Load model if a ``loadFilename`` is provided
if loadFilename:
    # If loading on same machine the model was trained on
    checkpoint = torch.load(loadFilename)
    # If loading a model trained on GPU to CPU
    #checkpoint = torch.load(loadFilename, map_location=torch.device('cpu'))
    encoder_sd = checkpoint['en']
    decoder_sd = checkpoint['de']
    encoder_optimizer_sd = checkpoint['en_opt']
    decoder_optimizer_sd = checkpoint['de_opt']
    embedding_sd = checkpoint['embedding']
    voc.__dict__ = checkpoint['voc_dict']


print('Building encoder and decoder ...')
# Initialize word embeddings
embedding = nn.Embedding(voc.num_words, hidden_size)
if loadFilename:
    embedding.load_state_dict(embedding_sd)
# Initialize encoder & decoder models
encoder = EncoderRNN(hidden_size, embedding, encoder_n_layers, dropout)
decoder = LuongAttnDecoderRNN(attn_model, embedding, hidden_size, voc.num_words, decoder_n_layers, dropout)
if loadFilename:
    encoder.load_state_dict(encoder_sd)
    decoder.load_state_dict(decoder_sd)
# Use appropriate device
encoder = encoder.to(device)
decoder = decoder.to(device)
print('Models built and ready to go!')

Building encoder and decoder ...
Models built and ready to go!

运行训练

如果要训练模型，请运行以下代码块。

首先我们设置训练参数，然后初始化优化器，最后调用 trainIters 函数来运行训练迭代。

# Configure training/optimization
clip = 50.0
teacher_forcing_ratio = 1.0
learning_rate = 0.0001
decoder_learning_ratio = 5.0
n_iteration = 4000
print_every = 1
save_every = 500

# Ensure dropout layers are in train mode
encoder.train()
decoder.train()

# Initialize optimizers
print('Building optimizers ...')
encoder_optimizer = optim.Adam(encoder.parameters(), lr=learning_rate)
decoder_optimizer = optim.Adam(decoder.parameters(), lr=learning_rate * decoder_learning_ratio)
if loadFilename:
    encoder_optimizer.load_state_dict(encoder_optimizer_sd)
    decoder_optimizer.load_state_dict(decoder_optimizer_sd)

# If you have an accelerator, configure it to call
for state in encoder_optimizer.state.values():
    for k, v in state.items():
        if isinstance(v, torch.Tensor):
            state[k] = v.to(device)

for state in decoder_optimizer.state.values():
    for k, v in state.items():
        if isinstance(v, torch.Tensor):
            state[k] = v.to(device)

# Run training iterations
print("Starting Training!")
trainIters(model_name, voc, pairs, encoder, decoder, encoder_optimizer, decoder_optimizer,
           embedding, encoder_n_layers, decoder_n_layers, save_dir, n_iteration, batch_size,
           print_every, save_every, clip, corpus_name, loadFilename)

Building optimizers ...
Starting Training!
Initializing ...
Training...
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运行评估

要与模型聊天，请运行以下代码块。

# Set dropout layers to ``eval`` mode
encoder.eval()
decoder.eval()

# Initialize search module
searcher = GreedySearchDecoder(encoder, decoder)

# Begin chatting (uncomment and run the following line to begin)
# evaluateInput(encoder, decoder, searcher, voc)

结论

本次教程到此结束。恭喜你，现在你已经掌握了构建生成式聊天机器人模型的基础知识！如果你有兴趣，可以尝试通过微调模型和训练参数以及定制用于训练模型的数据来调整聊天机器人的行为。

查看其他教程，了解更多 PyTorch 中很酷的深度学习应用！