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Electronic medical record entity relationship extraction method based on shortest dependency subtree

An entity relationship and electronic medical record technology, which is applied in unstructured text data retrieval, patient-specific data, semantic tool creation, etc., can solve problems such as not being able to express semantic information of sentences well, and sentences are too long, so as to improve model performance , the effect of clear semantic relationship

Inactive Publication Date: 2019-08-30
SICHUAN UNIV
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Problems solved by technology

[0004] Aiming at the current situation and existing problems of the above-mentioned existing electronic medical record entity relationship extraction model, the present invention proposes an electronic medical record entity relationship extraction method based on the shortest dependent subtree, which overcomes the problem caused by the existing electronic medical record entity relationship extraction model due to too long sentences. The problem of not being able to represent the semantic information of the sentence well
[0006] The present invention can not only delete noise vocabulary and compress the sentence length, but also completely retain the key words representing the relationship between entities, so that the semantic relationship of the compressed sentence is more clear, so it overcomes the problem of the existing electronic medical record entity relationship extraction model. The problem of not being able to represent the semantic information of the sentence well due to the long length has improved the performance of the model

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  • Electronic medical record entity relationship extraction method based on shortest dependency subtree
  • Electronic medical record entity relationship extraction method based on shortest dependency subtree
  • Electronic medical record entity relationship extraction method based on shortest dependency subtree

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Embodiment Construction

[0012] Below in conjunction with specific embodiment the present invention is described in further detail:

[0013] Such as figure 1 As shown, the model is mainly composed of the original input layer, the shortest subtree layer (Sub-Tree Parse Layer, STPLayer), feature extraction layer, embedding layer, BLSTM coding layer, sentence-level semantic representation layer and output layer. The detailed function of each layer is introduced as follows.

[0014] 1. Original input layer: input the original electronic medical record sentence.

[0015] 2. The shortest subtree layer: Use dependency syntax analysis to extract the shortest subtree based on entities to compress the length of sentences. The details are as follows:

[0016] 1) Use transition-based dependency syntax analysis to obtain the dependency syntax tree of the original input sentence

[0017] The main goal of transition-based dependency syntax analysis is to predict a transition sequence based on the characteristic...

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Abstract

The invention provides an electronic medical record entity relationship extraction method based on a shortest dependency subtree. The method comprises the following steps: firstly, extracting an entity-based shortest subtree from an original sentence through dependency syntactic analysis to compress the sentence length; secondly, coding the statements through a bidirectional long short-term memory(BLSTM) neural network, and then coding the statements through the BLSTM neural network; learning final semantic representation of the sentences through a maximum pooling layer (Max Pooling), and finally classifying the sentences through a softmax classifier to obtain an entity relationship. According to the method, noise vocabularies and compressed statement lengths can be deleted. Meanwhile, the key words representing the relations between the entities are completely reserved, so that the compressed statement semantic relations are clearer. The problem that semantic information of statements cannot be well represented due to too long statements of an existing electronic medical record entity relation extraction model is solved, and the performance of the relation extraction model is improved.

Description

technical field [0001] The invention belongs to the field of natural language processing and relates to an entity relationship extraction method, in particular to an electronic medical record entity relationship extraction method based on the shortest dependent subtree. Background technique [0002] With the advent of the big data era, data in various fields is growing rapidly. Especially for the medical field, a large number of electronic medical records are generated in clinical diagnosis and treatment, which contain a large amount of unstructured text and medical and health knowledge. Effective mining and utilization of this knowledge is of great significance to the development of medical and health care. An effective way to mine knowledge in electronic medical records is the technology related to information extraction, and the relationship extraction between conceptual entities is an important part of information extraction. [0003] Currently, there are mainly machin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F16/35G06F16/36G16H10/60
CPCG06F16/35G06F16/36G16H10/60
Inventor 李智冯苗李健
Owner SICHUAN UNIV
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