将高斯噪声添加到浮点数据集中并保存(Python) [英] Adding gaussian noise to a dataset of floating points and save it (python)

问题描述

我正在研究分类问题，我需要在数据集中添加不同级别的高斯噪声，并进行分类实验，直到我的ML算法无法对数据集进行分类.不幸的是，我不知道该怎么做.关于如何添加高斯噪声的任何建议或编码技巧?

I'm working on classification problem where i need to add different levels of gaussian noise to my dataset and do classification experiments until my ML algorithms can't classify the dataset. unfortunately i have no idea how to do that. any advise or coding tips on how to add the gaussian noise?

推荐答案

您可以按照以下步骤操作:

You can follow these steps:

1. 将数据加载到熊猫数据框中 clean_signal = pd.read_csv("data_file_name")
2. 使用numpy生成尺寸与数据集相同的高斯噪声.
3. 使用 signal = clean_signal + noise
将高斯噪声添加到干净信号中

1. Load the data into a pandas dataframe clean_signal = pd.read_csv("data_file_name")
2. Use numpy to generate Gaussian noise with the same dimension as the dataset.
3. Add gaussian noise to the clean signal with signal = clean_signal + noise

---

这是一个可复制的示例:

---

Here's a reproducible example:

import pandas as pd
# create a sample dataset with dimension (2,2)
# in your case you need to replace this with 
# clean_signal = pd.read_csv("your_data.csv")   
clean_signal = pd.DataFrame([[1,2],[3,4]], columns=list('AB'), dtype=float) 
print(clean_signal)
"""
print output: 
    A    B
0  1.0  2.0
1  3.0  4.0
"""
import numpy as np 
mu, sigma = 0, 0.1 
# creating a noise with the same dimension as the dataset (2,2) 
noise = np.random.normal(mu, sigma, [2,2]) 
print(noise)

"""
print output: 
array([[-0.11114313,  0.25927152],
       [ 0.06701506, -0.09364186]])
"""
signal = clean_signal + noise
print(signal)
"""
print output: 
          A         B
0  0.888857  2.259272
1  3.067015  3.906358
""" 

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没有注释和打印语句的整体代码:

---

Overall code without the comments and print statements:

import pandas as pd
# clean_signal = pd.read_csv("your_data.csv")
clean_signal = pd.DataFrame([[1,2],[3,4]], columns=list('AB'), dtype=float) 
import numpy as np 
mu, sigma = 0, 0.1 
noise = np.random.normal(mu, sigma, [2,2])
signal = clean_signal + noise

---

要将文件保存回csv

---

To save the file back to csv

signal.to_csv("output_filename.csv", index=False)

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