算法流程图
详细实现步骤解析
1. 数据特征深度解析
# 输入数据结构示例
{
"timestamp": "2023-01-01 16:30:00", # 4Hz采样
"revolutions": 1520, # 电机转速(与x1-x4强相关)
"humidity": 62.3, # 湿度(与x5完全共线性)
"x1": 0.87, "x2": 1.02, "x3": 0.93, # 机电传感器组
"x4": 1.15, "x5": 62.3, # 物理传感器
"vibration": 4.78 # 目标值(单位:mm/s²)
}
2. 关键特征工程实现
# 滞后特征(捕捉时序依赖)
df["vibration_lag_1"] = df["vibration"].shift(1) # 前1秒振动状态
df["vibration_lag_2"] = df["vibration"].shift(2) # 前2秒振动状态
# 动态窗口统计(平滑噪声)
df["rolling_vibration"] = df["vibration"].rolling(10).mean() # 2.5秒窗口均值
df["ema_vibration"] = df["vibration"].ewm(span=10).mean() # 指数衰减加权
# 交互特征(物理规律建模)
df["humidity_x5"] = df["humidity"] * df["x5"] # 湿度-传感器协同效应
# PCA降维(处理x1-x4强相关)
pca = PCA(n_components=2)
df[["PCA1", "PCA2"]] = pca.fit_transform(df[["x1","x2","x3","x4"]])
3. 模型优化核心技术
# 随机森林超参数空间
param_dist = {
'n_estimators': [50, 150, 250], # 树的数量
'max_depth': [None, 15, 30], # 树深度控制
'min_samples_split': [2, 5], # 节点分裂最小样本
'min_samples_leaf': [1, 2], # 叶节点最小样本
'max_features': ['sqrt', 0.8] # 特征采样比例
}
# 贝叶斯优化实现
opt = BayesianOptimization(
estimator=RandomForestRegressor(),
search_spaces=param_dist,
cv=5,
n_iter=50,
scoring='neg_mean_squared_error'
所用模块
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from sklearn.impute import SimpleImputer
from sklearn.model_selection import train_test_split,GridSearchCV,RandomizedSearchCV,learning_curve,cross_val_score
from sklearn.preprocessing import StandardScaler
from sklearn.pipeline import make_pipeline
from sklearn.compose import ColumnTransformer
from sklearn.linear_model import SGDRegressor
from sklearn.tree import DecisionTreeRegressor
from sklearn.ensemble import RandomForestRegressor
from sklearn.decomposition import PCA
import xgboost as xgb
import warnings
warnings.filterwarnings('ignore')
1.所有代码均经过运行测试,没有问题。
2.拍前请仔细阅读作品简介,这非常重要,因为涉及到不同的编程语言(Python或matlab)。
3.程序为特殊商品,经售出不退,有问题请及时联系。
4.建议有一定Python或Matlab基础的同学或工程师购买。
5.该代码不讲解哦。