Understanding the Self-Attention Mechanism

How can we create the query, key, and value matrices? To create these, we introduce three new weight matrices called $W^Q$ , $W^K$ , $W^V$. We create the query, $Q$, key, $K$, and value, $V$, matrices by multiplying the input matrix $X$ by $W^Q$ , $W^K$ , and $W^V$ respectively.