Atención Bahdanau
La Atención Bahdanau, también conocida como atención aditiva, es un mecanismo utilizado en redes neuronales, especially in tareas de procesamiento de lenguaje natural like machine translation. It was introduced by Dzmitry Bahdanau and his colleagues in their 2014 paper, which aimed to improve the performance of sequence-to-sequence models.
The core idea behind Bahdanau Attention is to allow the model to dynamically focus on different parts of the input sequence at each step of the output generation process. Traditional sequence models, like redes neuronales recurrentes (RNNs), encode the entire input sequence into a fixed-size context vector. This can lead to difficulties in capturing long-range dependencies, as important information may be lost.
Bahdanau Attention addresses this issue by calculating a set of attention scores for the input sequence. For each token de salida being generated, the model computes a context vector based on the relevant parts of the input sequence. This involves three main components: a scoring function that evaluates how well each input element aligns with the current output state, a softmax function that normalizes these scores to create a probability distribution, and a weighted sum of the input features based on these scores to create the context vector.
Este vector de contexto se usa luego junto con el estado actual de la decoder to produce the next output token. By doing so, the model can selectively focus on the most relevant parts of the input, which significantly enhances its performance, especially in tasks involving long sequences.
En general, la Atención Bahdanau ha desempeñado un papel crucial en el avance de las capacidades de las redes neuronales en diversas aplicaciones, incluyendo traducción, resumen y más.