A data scientist is working with a language model that has already been fully trained on a massive text corpus, and its internal configuration is now fixed. The scientist's goal is to take a new sentence, represented by the variable $\mathbf{x}$, and use this finalized model to convert it into a matrix of numerical vectors, represented by the variable $\mathbf{H}$. Which of the following equations correctly represents this specific operation?

The equation $\mathbf{H} = \text{Encode}_{\hat{\theta}}(\mathbf{x})$ describes how a pre-trained model generates a numerical representation from an input sequence. Match each symbol from the equation to its correct description.

Troubleshooting a Sequence Encoder