self attention layer
时间: 2023-09-27 11:04:22 浏览: 87
layer
Self-attention layer is a type of layer commonly used in transformer-based neural networks, including GPT (Generative Pre-trained Transformer) and BERT (Bidirectional Encoder Representations from Transformers). It allows the model to attend to different parts of the input sequence while processing it.
In self-attention, each input token is associated with three vectors: the query, key, and value vectors. These vectors are computed through linear transformations of the input embedding. The self-attention layer then computes a weighted sum of the value vectors, where the weights are determined by the dot product of the query and key vectors. The resulting output is a context vector that represents the input token's relationship with the other tokens in the sequence.
Self-attention enables the model to focus on the most relevant parts of the input sequence, which has been shown to be effective in natural language processing tasks such as language modeling, machine translation, and question answering.
阅读全文