我正在研究一个基本上是基于知识的问答系统的项目。我的系统接受用户查询，从维基百科下载相关文档，剥离所有 html 标签并提取纯文本。在此之后，它将文档标记为句子，然后形成术语-文档（TD）矩阵（查询也作为句子传递）。然后将该 TD 矩阵转发到 pLSA（概率潜在语义分析）算法。然后，最后计算文档（句子）向量与查询向量之间的余弦相似度。根据与查询向量的相似度，将最相关的句子显示为答案。（Stemming 也在 TD 矩阵的形成过程中完成）。问题是确实显示了结果，但不是最相关的。我哪里错了？我遵循的策略是否正确，或确实存在任何其他可能有帮助的算法？下面我展示了我的系统返回的一些问题及其答案：
What is photosynthesis?
ANSWER 1 : The stroma contains stacks (grana) of thylakoids, which are the site of photosynthesis
ANSWER 2 : Factors leaf is the primary site of photosynthesis in plants
ANSWER 3 : Samuel Ruben and Martin Kamen used radioactive isotopes to determine that the oxygen liberated in photosynthesis came from the water
ANSWER 4 : In plants, algae and cyanobacteria, photosynthesis releases oxygen
另一个问题
What is Artificial Intelligence?
ANSWER 1 : the problem of creating 'artificial intelligence' will substantially be solved"
ANSWER 2 : 37 The leading-edge definition of artificial intelligence research is changing over time
ANSWER 3 : Stories of these creatures and their fates discuss many of the same hopes, fears and ethical concerns that are presented by artificial intelligence
ANSWER 4 : History of artificial intelligence and Timeline of artificial intelligence Thinking machines and artificial beings appear in Greek myths , such as Talos of Crete , the bronze robot of Hephaestus , and Pygmalion's Galatea 13 Human likenesses believed to have intelligence were built in every major civilization
另一个问题
Who is a hacker?
ANSWER 1 : 19 Hackers (short stories) Helba from the
ANSWER 2 : 16 Rafael Núñez aka RaFa was a notorious most wanted hacker by the FBI since 2001
ANSWER 3 : Often, this type of 'white hat' hacker is called an ethical hacker
ANSWER 4 : Hackers also commonly use port scanners
又一次运行
What is biology?
ANSWER 1 : Molecular biology is the study of biology at a molecular level
ANSWER 2 : molecular biology studies the complex interactions of systems of biological molecules
ANSWER 3 : The similarities and differences between cell types are particularly relevant to molecular biology
ANSWER 4 : Contents History Foundations of modern biology 2