mirror of
https://github.com/ChuXunYu/OfficeFileHandle.git
synced 2026-01-31 02:01:26 +00:00
77 lines
2.9 KiB
Python
77 lines
2.9 KiB
Python
import pandas as pd
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import numpy as np
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from sklearn.gaussian_process import GaussianProcessRegressor
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from sklearn.gaussian_process.kernels import RBF, WhiteKernel, ConstantKernel as C
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from sklearn.preprocessing import StandardScaler
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from sklearn.model_selection import train_test_split
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from sklearn.metrics import mean_squared_error, r2_score
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from sklearn.pipeline import make_pipeline
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from sklearn.linear_model import LinearRegression
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from sklearn.preprocessing import PolynomialFeatures
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try:
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# 1. 加载数据
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df0 = pd.read_csv('input_file_0.csv')
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df1 = pd.read_csv('input_file_1.csv')
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df = pd.concat([df0, df1], axis=0, ignore_index=True)
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# 清洗列名
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df.columns = [c.strip() for c in df.columns]
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# 筛选男胎
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male_df = df[df['Y染色体浓度'].notna() & (df['Y染色体浓度'] > 0)].copy()
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# 解析孕周
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def parse_ga(s):
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try:
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if pd.isna(s): return np.nan
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s = str(s).lower().replace('w', ' ').replace('+', ' ').split()
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return float(s[0]) + (float(s[1])/7.0 if len(s) > 1 else 0)
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except:
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return np.nan
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male_df['GA_numeric'] = male_df['检测孕周'].apply(parse_ga)
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# 剔除缺失值
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male_df = male_df.dropna(subset=['Y染色体浓度', 'GA_numeric', '孕妇BMI'])
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# 2. 准备数据
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X = male_df[['GA_numeric', '孕妇BMI']].values
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y = male_df['Y染色体浓度'].values
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# 数据集划分
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X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
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# 3. 建立 GPR 模型
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# 关键：数据标准化对 GPR 至关重要
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scaler_X = StandardScaler()
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X_train_scaled = scaler_X.fit_transform(X_train)
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X_test_scaled = scaler_X.transform(X_test)
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# Kernel设计: RBF(趋势) + WhiteKernel(噪声)
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# 初始 length_scale 设为 1.0 (因为数据已标准化)
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kernel = C(1.0) * RBF(length_scale=1.0) + WhiteKernel(noise_level=0.1)
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# 训练 (n_restarts_optimizer=0 以节省时间，实际建模建议设为 5-10)
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gpr = GaussianProcessRegressor(kernel=kernel, n_restarts_optimizer=0, random_state=42)
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gpr.fit(X_train_scaled, y_train)
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# 4. 建立对比模型 (交互项回归)
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poly = make_pipeline(
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PolynomialFeatures(degree=2, interaction_only=True, include_bias=False),
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LinearRegression()
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)
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poly.fit(X_train, y_train)
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# 5. 评估
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y_pred_gpr, y_std = gpr.predict(X_test_scaled, return_std=True)
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y_pred_poly = poly.predict(X_test)
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print("=== 模型性能大比拼 (Test Set) ===")
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print(f"GPR RMSE: {np.sqrt(mean_squared_error(y_test, y_pred_gpr)):.6f}")
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print(f"Poly RMSE: {np.sqrt(mean_squared_error(y_test, y_pred_poly)):.6f}")
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print(f"GPR R2: {r2_score(y_test, y_pred_gpr):.4f}")
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print(f"Poly R2: {r2_score(y_test, y_pred_poly):.4f}")
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print(f"\nGPR Learned Kernel Params: {gpr.kernel_}")
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except Exception as e:
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print(f"Error: {e}") |