画出激活函数ELU函数图
时间: 2024-02-29 19:44:57 浏览: 17
下面是ELU激活函数的图示:
![ELU函数图示](https://cdn.jsdelivr.net/gh/1071942338/CDN/images/ELU.png)
其中,α是一个常数,即$x<0$时的斜率。当α=1时,ELU函数的形式如下:
$$
ELU(x) =
\begin{cases}
x, & \text{if}\ x \geq 0 \\
\alpha(e^x-1), & \text{if}\ x < 0
\end{cases}
$$
相关问题
激活函数图像代码python
以下是使用Python绘制激活函数图像的代码示例:
ReLU激活函数图像代码:
```python
from matplotlib import pyplot
import numpy as np
def relu(x):
if x > 0:
return x
else:
return 0
def func():
x = np.arange(-5,5,0.02)
y = []
for i in x:
yi = relu(i)
y.append(yi)
pyplot.xlabel("x")
pyplot.ylabel("y")
pyplot.title("ReLU")
pyplot.plot(x,y)
pyplot.show()
func()
```
ELU激活函数图像代码:
```python
import numpy as np
import matplotlib.pyplot as plt
def elu(x, a):
y = x.copy()
for i in range(y.shape < 0:
y[i = a * (np.exp(y[i]) - 1)
return y
x = np.arange(-10, 10, 0.01)
plt.tick_params(labelsize=14)
y_elu = elu(x, 0.3)
plt.plot(x, y_elu, 'b', linewidth=2.5, label='ELU')
plt.legend(loc='upper left', fontsize=16, frameon=False)
plt.tight_layout()
plt.savefig("elu.jpeg", dpi=600, format="jpeg")
plt.show()
```
Sigmoid激活函数图像代码:
```python
import numpy as np
import matplotlib.pyplot as plt
def sigmoid(x):
return 1 / (1 + np.exp(-x))
x = np.arange(-10, 10, 0.01)
plt.tick_params(labelsize=14)
y_sigmoid = sigmoid(x)
plt.plot(x, y_sigmoid, 'b', linewidth=2.5, label='Sigmoid')
plt.legend(loc='upper left', fontsize=16, frameon=False)
plt.tight_layout()
plt.savefig("sigmoid.jpeg", dpi=600, format="jpeg")
plt.show()
```
请注意,这些代码是根据引用的内容编写的,用于绘制ReLU、ELU和Sigmoid激活函数的图像。你可以根据自己的需求进行修改和使用。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [神经网络中常用激活函数图像绘制(Python)](https://blog.csdn.net/qq_36035111/article/details/93405736)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [python绘制激活函数图像](https://blog.csdn.net/m0_49878324/article/details/122395348)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
[ .reference_list ]
绘制5种常见激活函数的图:Sigmoid 激活函数、tanh 激活函数、ReLU 激活函数、Leaky ReLU激活函数、ELU激活函数使用python实现
以下是使用Python绘制5种常见激活函数的图的代码:
```python
import numpy as np
import matplotlib.pyplot as plt
# Sigmoid 激活函数
def sigmoid(x):
return 1 / (1 + np.exp(-x))
# tanh 激活函数
def tanh(x):
return np.tanh(x)
# ReLU 激活函数
def relu(x):
return np.maximum(0, x)
# Leaky ReLU 激活函数
def leaky_relu(x, alpha=0.01):
return np.maximum(alpha * x, x)
# ELU 激活函数
def elu(x, alpha=1.0):
return np.where(x > 0, x, alpha * (np.exp(x) - 1))
# 生成 x 值
x = np.linspace(-10, 10, 100)
# 绘制激活函数图像
plt.figure(figsize=(10, 6))
plt.plot(x, sigmoid(x), label='Sigmoid')
plt.plot(x, tanh(x), label='tanh')
plt.plot(x, relu(x), label='ReLU')
plt.plot(x, leaky_relu(x), label='Leaky ReLU')
plt.plot(x, elu(x), label='ELU')
plt.xlabel('x')
plt.ylabel('Activation')
plt.title('Activation Functions')
plt.legend()
plt.grid(True)
plt.show()
```
希望这个代码可以帮助你绘制出Sigmoid、tanh、ReLU、Leaky ReLU和ELU激活函数的图像。