# News
神经网络与深度学习课程设计(Neural_NetworksAndDeep_Learning新闻文本分类)
RNN、CNN网络模型分别实现的新闻文本分类
选题自2021年中软杯——新闻文本分类
选题要求:对新闻进行科学的分类既能够方便不同的阅读群体,根据需求快速选取自身感兴趣的新闻,也能够有效满足对海量的新闻素材提供科学的检索需求
RNN实现步骤:
1. 预处理:在RNN网络中,我们首先需要读取数据,由于每一条新闻的长度并不都是相同的,所以首先要将所有句子都规定成相同的长度。这里的句子长度并不是指所具有的字数相同,而是根据自己的分词算法,一句话分词结果的词的个数相同。对于词数不够的采用特殊码代替,我用的是PAD(词表中的特殊码,下面会介绍); 超过的部分进行截断丢弃。这里句子长度的选取需要根据自己的数据集的长度来选取,在我的数据集中,大多数新闻都是32词左右,故我选取的长度是32
2. 分词:读取新闻数据的一行,以tab 分隔标题和标签,读取vocab.pkl 文件,获取词表,如图:共有 4761个词,其中这里的PAD就是上面说到的特殊码,用来补充长度不够的句子。
3. 转换: RNN模型中,接收的输入是向量而不是文本,所以需要将一句话中的所有词都转变成向量,也就是进行词嵌入embedding。我这里直接采用了搜狗已经训练好的词嵌入模型embedding_SougouNews.npz
需要说明的是,因为新闻文本基本上都是一些常见的词,所以可以使用已经训练好的词嵌入模型,如果是做一些专业领域的词向量embedding,就需要自己训练模型。在搜狗的词嵌入模型中,官方论文给出的维度是300维,所以我在程序中也是指定300维的向量。
4. 输入维度: RNN网络中的输入维度 ( batch, max-word, f )其中 batch 指的是一次同时处理的新闻数量。例如,我在程序中指定的是 batch = 128, 即一次处理128条新闻。这里的max-word就是上面说到过的 一句话的最大长度 32, 也就是每句话进行embedding之前都具有32个词。而 f 就是每个词的维度,即上面规定的 300维
RNN分层:
第一层: 输入层,即embedding层
第二层: lstm层。参数(300维,隐藏神经元, lstm的层数,双向,第一维度是batch,dropout)。
第三层:全连接层。 参数( 特征数, 分类数)
第四层: 输出层。
LSTM训练
Lstm的训练主要是循环所有epoch中的所有batch,epoch是指定的,这里为10。
循环batch的过程中,与上面分析的一样,首先正向传播获取特征,然后反向传播获取特征,最后做拼接后输出。
每100轮做一次验证,根据batch中所有新闻的标签获取新闻分类的真实值,将输出中新闻对应的分类概率最大的那个作为预测值,计算出准确率和损失。如果这一次的损失比之前的更小,说明这一次训练得到的模型更好,故保存新的模型。然后循环下一个batch,循环往复
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基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用无需修改,确保可以运行。也可作为期末大作业。 基于神经网络与深度学习的新闻文本分类源码+项目说明.zip这是95分以上高分必过课程设计项目,下载即用
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