Llama-2-7b-hf.txt

<s> Vaswani et al. (2017) introduced the Transformers model for sequence-to-sequence (seq2seq) tasks. It achieved state-of-the-art performance on machine translation and summarization tasks by introducing attention-based recurrent neural networks (RNNs, e.g., LSTMs) to capture long-range dependencies in the input sequence.
Transformers are composed of self-attention and feed-forward layers. The self-attention layer computes a weighted sum of inputs by attending to each input at different positions, whereas the feed-forward layer applies a linear transformation to the output of the self-attention layer. In this post, we’ll explore Transformer architectures and their training.
The architecture of a vanilla Transformer is shown in Figure 1. It consists of an encoder and a decoder. The encoder takes an input sequence $x \in \mathbb{R}^{T \times D}$ and outputs a sequence of hidden states $h_1, h_2, \hdots, h_T \in \mathbb{R}^{D}$. The decoder takes the hidden states of the encoder and outputs a sequence of hidden states $d_1, d_2, \hdots, d_T \in \mathbb{R}^{D}$.
Figure 1: Architecture of a vanilla Transformer.
The encoder is a stack of $N$ identical layers, each of which consists of a multi-head self-attention layer and a feed-forward layer. The multi-head self-attention layer has $K$ heads, each of which computes a weighted sum of the input sequence using different sets of keys and/or values. The feed-forward layer applies a linear transformation to the output of the self-attention layer.
The decoder is a stack of $N$ identical layers, each of which consists of a multi-head self-attention layer and a feed-forward layer. The multi-head self-attention layer has $K$ heads, each of which computes a weighted sum of the input sequence using different sets of keys and/or values. The feed-forward layer applies a linear transformation to the output of the self-attention layer.
The input sequence is fed into the encoder and the output sequence is fed into the decoder. The two sequences are concatenated and fed into the final feed-forward layer

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