from IPython.display import Image
Image(url='https://git.io/JtIQ1', width=500)
Image(url='https://git.io/JtIQH', width=500)
Image(url='https://git.io/JtIQ5', width=300)
Image(url='https://git.io/JtIQd', width=300)
Image(url='https://git.io/JtIQN', width=300)
Image(url='https://git.io/JtIQx', width=300)
Image(url='https://git.io/JtIQp', width=500)
Image(url='https://git.io/JtI7e', width=500)
$\boldsymbol{X} \in \mathbb{R}^{150\times4}$
$\begin{bmatrix} x_1^{(1)} & x_2^{(1)} & x_3^{(1)} & x_4^{(1)} \\ x_1^{(2)} & x_2^{(2)} & x_3^{(2)} & x_4^{(2)} \\ \vdots & \vdots & \vdots & \vdots \\ x_1^{(150)} & x_2^{(150)} & x_3^{(150)} & x_4^{(150)} \\ \end{bmatrix}$
벡터 : $\boldsymbol{x}\in\mathbb{R}^{n\times1}$
행렬 : $\boldsymbol{X}\in\mathbb{R}^{n\times m}$
샘플(행 벡터): $\boldsymbol{x}^{(i)}=\begin{bmatrix} x_1^{(i)} & x_2^{(i)} & x_3^{(i)} & x_4^{(i)}\end{bmatrix}$
특성(열 벡터): $\boldsymbol{x}_j=\begin{bmatrix} x_j^{(1)} \\ x_j^{(2)} \\ \vdots \\ x_j^{(150)} \end{bmatrix}$
타깃(열 벡터): $\boldsymbol{y}=\begin{bmatrix} y^{(1)} \\ y^{(2)} \\ \vdots \\ y^{(150)} \end{bmatrix}$ $(y \in \text{\{Setosa, Versicolor, Virginica\}})$
Image(url='https://git.io/JtI7J', width=700)