GPU vs CPU Surrogate Benchmark
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N timesteps:   16,000
N surrogates:  10,000
IAAFT iter:    100
CPU n_jobs:    -1
GPU device:    Tesla M40 (12.0 GB)

Method      CPU (s)    GPU (s)   Speedup   Equiv
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phase          61.7       20.9      2.9x    PASS
iaaft         227.8      175.6      1.3x    PASS