A matrix with training targets ¹, as a rank-2 tensor:

\begin{equation*} Y = \begin{pmatrix} \vphantom{\Big(} \vec{y}^1 & \cdots & \vec{y}^m \end{pmatrix} = \begin{pmatrix} y_1^1 & \cdots & y_1^m \\ \vdots & \ddots & \vdots \\ y_n^1 & \cdots & y_n^m \end{pmatrix} \in \mathbb{R}^{n \times m} \end{equation*}

where

• \(x^i\) is the \(i\)-th target
• \(x^i_j\) is the \(j\)-th target of the \(i\)-th example

and

• \(m\) is the number of examples
• \(n\) is the number of targets.

---

• Synonyms