Why need GNN

1. utilize the structure and relationship of data (CNN cannot deal with non-Euclidean space)
2. semi-supervised learning (partial labels)

梁启超语录

1. 大师通常能把自己的阅历甘苦用于指示我们，我们跟着他的路走，自然能事半功倍

2. 口号的几个要素：（1）语句简单；（2）意义明确；（3）内容丰富；（4）刺激性强；（5）法门可实行，不管聪明才智多少，都能有个下手处

3. 口号两个小计要素：（1）不要带宗教迷信；（2）不要带玄学性

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Ontology

Definition of Ontology reference at ` - A Study Investigating Typical Concepts and Guidelines for Ontology Building, 2015 - https://www.igi-global.com/dictionary/ontology/21117

The domain knowledge in ontologies can be formalized using 5 components A translation approach to portable ontology specification

• Classes: Set of classes (or concepts) that belong to the ontology. They may contain individuals (or instances), other classes, or a combination of both with their corresponding attributes.

• Relations: These define interrelations between two or several classes (object properties) or a concept to a data type (data type properties).

• Functions: This is a special case of relations.

• Axioms: These are used to impose constraints on the values of classes or instances. Axioms represent expressions in ontology (logical statement) and are always true when used inside the ontology.

• Instances: These represent the objects, elements or individuals of an ontology.

Concept

Based on [1], There is no unified definition of concept. A concept can be recognized as the relevant terms that shared the same meaning. Psychologically, it defnied as an idea shared in common in the minds of people who use these terms. It can also seen as a logical contruct, for example, a synset containing a set of words which can be exchanged for each other.