217 lines
7.8 KiB
Python
217 lines
7.8 KiB
Python
import argparse
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import csv
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import json
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import math
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import os
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import random
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import joblib
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import numpy as np
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import lightgbm as lgb
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import pandas as pd
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import matplotlib.pyplot as plt
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import seaborn as sns
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from sklearn.preprocessing import StandardScaler
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from sklearn.metrics import mean_absolute_error
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# =========================================================
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# Hyper Parameters
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# =========================================================
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TRAIN_SIZE = 0
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VALID_SIZE = 0
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RANDOM_STATE = 42
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# LightGBM 특정 하이퍼파라미터
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PARAMS = {
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'objective': 'regression',
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'metric': 'mae',
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'verbosity': -1,
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'boosting_type': 'gbdt',
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'random_state': RANDOM_STATE,
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'learning_rate': 0.02, # 더 정밀한 학습을 위해 하향
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'num_leaves': 63, # 더 복잡한 패턴 학습을 위해 상향
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'feature_fraction': 0.9,
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'bagging_fraction': 0.8,
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'bagging_freq': 5,
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'n_estimators': 3000 # 학습량 대폭 상향
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}
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CONTINUE_TRAINING = True
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ERROR_TOLERANCE = 0.1
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# =========================================================
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# 파일명
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# =========================================================
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FEATURES_FILENAME = "features.json"
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MEASURE_FILENAME = "measure.csv"
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MODEL_FILENAME = "model.pkl"
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SCALER_FILENAME = "scaler.pkl"
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FEATURE_NAMES_FILENAME = "features.txt"
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IGNORE_KEYS = {"songno", "difficulty"}
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def safe_float(value):
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if value is None: return 0.0
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x = float(value)
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return x if math.isfinite(x) else 0.0
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def train_model(working_dir: str, data_dir: str):
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random.seed(RANDOM_STATE)
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features_path = os.path.join(working_dir, FEATURES_FILENAME)
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measure_path = os.path.join(data_dir, MEASURE_FILENAME)
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model_path = os.path.join(working_dir, MODEL_FILENAME)
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scaler_path = os.path.join(working_dir, SCALER_FILENAME)
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feature_names_path = os.path.join(working_dir, FEATURE_NAMES_FILENAME)
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with open(features_path, "r", encoding="utf-8") as f:
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feature_data = json.load(f)
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if len(feature_data) == 0:
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raise ValueError("features.json is empty")
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feature_map = {(str(item["songno"]), str(item["difficulty"])): item for item in feature_data}
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feature_names = sorted([k for k in feature_data[0].keys() if k not in IGNORE_KEYS])
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dataset = []
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with open(measure_path, "r", encoding="utf-8") as f:
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reader = csv.reader(f)
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next(reader, None)
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for row in reader:
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if len(row) < 3: continue
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measure, songno, diff = safe_float(row[0]), str(row[1]), str(row[2])
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key = (songno, diff)
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if key in feature_map:
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features = [safe_float(feature_map[key].get(k, 0)) for k in feature_names]
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dataset.append((features, measure, songno, diff))
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random.shuffle(dataset)
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if len(dataset) < (TRAIN_SIZE + VALID_SIZE):
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raise ValueError(f"Not enough dataset ({len(dataset)} < {TRAIN_SIZE + VALID_SIZE})")
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train_dataset = dataset[:TRAIN_SIZE]
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valid_dataset = dataset[TRAIN_SIZE:TRAIN_SIZE + VALID_SIZE]
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X_train = np.array([x for x, _, _, _ in train_dataset], dtype=np.float32)
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y_train = np.array([y for _, y, _, _ in train_dataset], dtype=np.float32)
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X_valid = np.array([x for x, _, _, _ in valid_dataset], dtype=np.float32)
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y_valid = np.array([y for _, y, _, _ in valid_dataset], dtype=np.float32)
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valid_info = [(s, d) for _, _, s, d in valid_dataset]
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print(f"Train Size: {len(X_train)} | Valid Size: {len(X_valid)} | Features: {len(feature_names)}")
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if CONTINUE_TRAINING and os.path.exists(scaler_path):
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print("Loading existing scaler...")
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scaler = joblib.load(scaler_path)
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else:
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print("Creating new scaler...")
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scaler = StandardScaler()
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scaler.fit(X_train)
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X_train = scaler.transform(X_train)
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X_valid = scaler.transform(X_valid)
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if CONTINUE_TRAINING and os.path.exists(model_path):
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print("Loading existing model for incremental training...")
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model = joblib.load(model_path)
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model.fit(
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X_train, y_train,
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eval_set=[(X_valid, y_valid)],
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init_model=model,
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callbacks=[lgb.early_stopping(stopping_rounds=100)]
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)
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else:
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print("Creating new LightGBM model...")
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model = lgb.LGBMRegressor(**PARAMS)
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model.fit(
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X_train, y_train,
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eval_set=[(X_valid, y_valid)],
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callbacks=[lgb.early_stopping(stopping_rounds=100)]
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)
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pred = model.predict(X_valid)
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mae = mean_absolute_error(y_valid, pred)
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accuracy = np.sum(np.abs(pred - y_valid) <= ERROR_TOLERANCE) / len(y_valid)
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print(f"\nMAE: {mae:.4f} | Accuracy (±{ERROR_TOLERANCE}): {accuracy:.4f}")
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# =====================================================
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# save validate.json
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# =====================================================
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validate_details = []
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for i in range(len(y_valid)):
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actual = float(y_valid[i])
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predicted = float(pred[i])
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songno, diff = valid_info[i]
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validate_details.append({
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"songno": songno,
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"diff": diff,
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"actual": actual,
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"predicted": predicted,
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"error": actual - predicted
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})
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validate_details.sort(key=lambda x: abs(x["error"]), reverse=True)
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validate_result = {
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"summary": {
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"total_compared": len(y_valid),
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"average_absolute_error": float(mae),
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"accuracy": float(accuracy),
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"timestamp": "now",
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"script_used": "train/train_lightgbm.py"
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},
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"details": validate_details
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}
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validate_path = os.path.join(working_dir, "validate.json")
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with open(validate_path, "w", encoding="utf-8") as f:
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json.dump(validate_result, f, indent=2, ensure_ascii=False)
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print(f"Validation result saved: {validate_path}")
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# =====================================================
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# save validate.png
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# =====================================================
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try:
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plt.switch_backend('Agg')
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df_plot = pd.DataFrame(validate_details)
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df_plot['abs_error'] = df_plot['error'].abs()
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df_plot = df_plot.sort_values('abs_error', ascending=False).reset_index(drop=True)
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plt.figure(figsize=(12, 6))
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sns.scatterplot(data=df_plot, x=df_plot.index, y='abs_error', alpha=0.6, s=20, color='darkorange')
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plt.axhline(0.2, color='green', linestyle='--', linewidth=0.8, alpha=0.5, label='Target (0.2)')
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plt.axhline(0.5, color='blue', linestyle='--', linewidth=0.8, alpha=0.5)
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plt.axhline(1.0, color='red', linestyle='--', linewidth=0.8, alpha=0.5)
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plt.ylim(0, max(3.5, df_plot['abs_error'].max() + 0.5))
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plt.title(f'Validation Absolute Error - {os.path.basename(working_dir)}', fontsize=14)
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plt.xlabel('Samples (Sorted by Error Magnitude)', fontsize=12)
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plt.ylabel('Absolute Error', fontsize=12)
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plt.grid(True, axis='y', alpha=0.3)
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plot_path = os.path.join(working_dir, "validate.png")
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plt.savefig(plot_path)
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plt.close()
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print(f"Validation plot saved: {plot_path}")
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except Exception as e:
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print(f"[WARN] Failed to create validation plot: {e}")
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joblib.dump(model, model_path)
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joblib.dump(scaler, scaler_path)
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with open(feature_names_path, "w", encoding="utf-8") as f:
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for name in feature_names: f.write(name + "\n")
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print(f"\nSaved to {working_dir}: {MODEL_FILENAME}, {SCALER_FILENAME}")
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument("--workingDir", required=True)
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parser.add_argument("--dataDir", required=True)
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parser.add_argument("--trainSize", required=True, type=int)
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parser.add_argument("--validSize", required=True, type=int)
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args = parser.parse_args()
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TRAIN_SIZE, VALID_SIZE = args.trainSize, args.validSize
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train_model(args.workingDir, args.dataDir)
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