import numpy as np
import matplotlib.pyplot as plt

x = np.array([[9], [4], [8], [7]])     #一維陣列建立

x

x.shape

x = np.array([[9, 4, 8 , 7], [8, 7, 4, 5]])  #二維陣列建立

x

x.shape

# 矩陣
a = x[0]
b = x[1]

a

a.reshape(2,2)

a = a.reshape(2,2)
b = b.reshape(2,2)

x = np.array([a,b])

x

x.shape

#one hot encoding
from tensorflow.keras.utils import to_categorical

x=[0,1,2,3,4,5]

# 類別個數:6
x_1 = to_categorical(x,6)
x_1