=== SYSTEM ===
  cpu: Intel64 Family 6 Model 154 Stepping 4, GenuineIntel
  machine: AMD64
  python: 3.11.9
  lgb: 4.5.0
  numpy: 1.26.4
  pandas: 2.2.3
  os: Windows-10-10.0.26200-SP0
  cores_physical: 10
  cores_logical: 12
  cpu_freq_mhz_max: 1100
  ram_gb: 15.7

=== BENCH (label=oldpc) 実行中… ===
  [1/4] feature engineering ...
        5.79s
  [2/4] LightGBM multi-thread ...
        233.21s
  [3/4] LightGBM single-thread ...
        61.32s
  [4/4] numpy matmul (BLAS) ...
        12.95s

==============================================
  RESULT SUMMARY  (label = oldpc)
==============================================
  CPU   : Intel64 Family 6 Model 154 Stepping 4, GenuineIntel
  cores : phys=10 logical=12  RAM=15.7GB
  lgb=4.5.0 numpy=1.26.4
----------------------------------------------
  1) feature (pandas)      :     5.79 s
  2) LightGBM multi-thread :   233.21 s
  3) LightGBM single-thread:    61.32 s
  4) numpy matmul (BLAS)   :    12.95 s
----------------------------------------------
  TOTAL                    :   313.27 s
==============================================
  → 保存: bench_heavy_oldpc.json

​