绘制下列函数图形 1. def step_function(x): return np.array(x > 0, dtype=np.int) 2. def sigmoid(x): return 1 / (1 + np.exp(-x))

好的，下面是两个函数的图形：

1. `step_function`

import numpy as np
import matplotlib.pyplot as plt

def step_function(x):
    return np.array(x > 0, dtype=np.int)

x = np.linspace(-5, 5, 100)
y = step_function(x)

plt.plot(x, y)
plt.title('Step Function')
plt.xlabel('x')
plt.ylabel('y')
plt.show()


2. `sigmoid`

import numpy as np
import matplotlib.pyplot as plt

def sigmoid(x):
    return 1 / (1 + np.exp(-x))

x = np.linspace(-5, 5, 100)
y = sigmoid(x)

plt.plot(x, y)
plt.title('Sigmoid Function')
plt.xlabel('x')
plt.ylabel('y')
plt.show()