Human: how to calculate the magnitude of a vector in with numpy. Assistant: 
Here is a Python function to calculate the magnitude of a vector in with numpy

import numpy as np

def magnitude(vector):
    """
    :param vector: a vector
    :type vector: numpy.array
    :return: magnitude of the vector
    :rtype: float
    """
    return np.sqrt(np.sum(np.square(vector)))

# Enter the vector
vector = np.array([1, 2, 3])

# Calling the function
print((magnitude(vector)))

#Example Output
# 3.7416573867739413

#Remember to inspect code for bugs.