Question and answer method, knowledge graph completion method and related devices

The invention discloses a question and answer method, a knowledge graph completion method and a related device, and the method comprises the steps: predicting a plurality of tail entity prediction representations through employing a first head text entity of a to-be-supplemented tail entity in a target knowledge graph and a representation of a first text relation; searching a target tail text entity from the target knowledge graph based on the plurality of tail entity prediction representations, and generating supplementary knowledge of the target knowledge graph by using the first head text entity, the first text relationship and the target tail text entity; obtaining a to-be-answered question; based on the question representation of the to-be-answered question, searching knowledge matched with the to-be-answered question from the target knowledge graph supplemented with knowledge; and obtaining the answer of the to-be-answered question based on the knowledge matched with the to-be-answered question, and in