Signal Normalization, DC Offset, and RMS Measurement

import numpy as np
import matplotlib.pyplot as plt

plt.style.use('seaborn-v0_8-whitegrid')
plt.rcParams['axes.grid'] = True
plt.rcParams['legend.frameon'] = True

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Cell In[1], line 1
----> 1 import numpy as np
      2 import matplotlib.pyplot as plt
      4 plt.style.use('seaborn-v0_8-whitegrid')

ModuleNotFoundError: No module named 'numpy'

def normalize(x):
    return x / np.max(np.abs(x))