Автоматически выберите модель регрессии оптимизированными гиперпараметрами
Учитывая предиктор и данные об ответе, fitrauto автоматически пробует выбор типов модели регрессии с различными гиперзначениями параметров. Функция использует Байесовую оптимизацию, чтобы выбрать модели и их гиперзначения параметров, и вычисляет следующее для каждой модели: журнал (1 + valLoss), где valLoss является среднеквадратической ошибкой (MSE) перекрестной проверки. После того, как оптимизация завершена, fitrauto возвращает модель, обученную на целом наборе данных, который, как ожидают, лучше всего предскажет ответы для новых данных. Можно использовать predict и loss объектные функции возвращенной модели, чтобы предсказать на новых данных и вычислить набор тестов MSE, соответственно.
Использование fitrauto когда вы не уверены, какие типы модели лучше всего удовлетворяют вашим данным. Для получения информации об альтернативных методах для настройки гиперпараметров моделей регрессии см. альтернативную функциональность.
Mdl = fitrauto(Tbl,ResponseVarName)Mdl регрессии настроенными гиперпараметрами. Таблица Tbl содержит переменные предикторы и переменную отклика, где ResponseVarName имя переменной отклика.
Mdl = fitrauto(___,Name,Value)HyperparameterOptimizationOptions аргумент пары "имя-значение", чтобы задать, как Байесова оптимизация выполняется.
[ дополнительно возвращает Mdl,OptimizationResults] = fitrauto(___)OptimizationResults, BayesianOptimization объект, содержащий результаты выбора модели и настраивающего процесса гиперпараметра.
Используйте fitrauto автоматически выбрать модель регрессии оптимизированными гиперпараметрами, учитывая предиктор и данные об ответе, хранимые в таблице.
Загрузка данных
Загрузите carbig набор данных, который содержит измерения автомобилей, сделанных в 1970-х и в начале 1980-х.
load carbigСоставьте таблицу, содержащую переменные предикторы Acceleration, Displacement, и так далее, а также переменная отклика MPG.
cars = table(Acceleration,Displacement,Horsepower, ...
Model_Year,Origin,Weight,MPG);Данные о разделе
Разделите данные в наборы обучающих данных и наборы тестов. Используйте приблизительно 80% наблюдений для выбора модели и настраивающего процесса гиперпараметра, и 20% наблюдений, чтобы проверить производительность итоговой модели, возвращенной fitrauto. Используйте cvpartition разделить данные.
rng('default') % For reproducibility of the data partition c = cvpartition(length(MPG),'Holdout',0.2); trainingIdx = training(c); % Training set indices carsTrain = cars(trainingIdx,:); testIdx = test(c); % Test set indices carsTest = cars(testIdx,:);
Запустите fitrauto
Передайте обучающие данные fitrauto. По умолчанию, fitrauto определяет соответствующие типы модели, чтобы попробовать, использует Байесовую оптимизацию, чтобы найти хорошие гиперзначения параметров и возвращает обученную модель Mdl с лучшей ожидаемой эффективностью. Кроме того, fitrauto предоставляет график оптимизации и итеративное отображение результатов оптимизации. Для получения дополнительной информации о том, как интерпретировать эти результаты, смотрите Многословное Отображение.
Ожидайте, что этот процесс займет время. Чтобы ускорить процесс оптимизации, рассмотрите выполнение оптимизации параллельно, если у вас есть лицензия Parallel Computing Toolbox™. Для этого передайте 'HyperparameterOptimizationOptions',struct('UseParallel',true) к fitrauto как аргумент пары "имя-значение".
Mdl = fitrauto(carsTrain,'MPG');Learner types to explore: ensemble, svm, tree Total iterations (MaxObjectiveEvaluations): 90 Total time (MaxTime): Inf |=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 1 | Best | 2.5161 | 1.4197 | 2.5161 | 2.5161 | tree | MinLeafSize: 6 |
| 2 | Accept | 4.1439 | 0.68799 | 2.5161 | 2.5161 | svm | BoxConstraint: 336.91 | | | | | | | | | KernelScale: 0.0018275 | | | | | | | | | Epsilon: 0.1074 |
| 3 | Accept | 4.144 | 5.5942 | 2.5161 | 2.5161 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 257 | | | | | | | | | MinLeafSize: 156 |
| 4 | Accept | 3.1976 | 20.387 | 2.5161 | 2.5161 | svm | BoxConstraint: 0.033502 | | | | | | | | | KernelScale: 153.38 | | | | | | | | | Epsilon: 0.093672 |
| 5 | Best | 2.5041 | 0.13106 | 2.5041 | 2.5101 | tree | MinLeafSize: 5 |
| 6 | Best | 2.2096 | 7.0177 | 2.2096 | 2.5101 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 287 | | | | | | | | | MinLeafSize: 1 |
| 7 | Accept | 2.7182 | 0.085053 | 2.2096 | 2.5057 | tree | MinLeafSize: 1 |
| 8 | Accept | 17.207 | 23.312 | 2.2096 | 2.5057 | svm | BoxConstraint: 196.73 | | | | | | | | | KernelScale: 34.789 | | | | | | | | | Epsilon: 0.03716 |
| 9 | Accept | 4.1439 | 0.057226 | 2.2096 | 2.5057 | svm | BoxConstraint: 346.92 | | | | | | | | | KernelScale: 0.032493 | | | | | | | | | Epsilon: 0.23974 |
| 10 | Best | 2.1916 | 6.4368 | 2.1916 | 2.5057 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 278 | | | | | | | | | MinLeafSize: 13 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 11 | Accept | 2.8889 | 0.1325 | 2.1916 | 2.5057 | svm | BoxConstraint: 0.033068 | | | | | | | | | KernelScale: 585.38 | | | | | | | | | Epsilon: 4.6993 |
| 12 | Accept | 4.1439 | 0.06362 | 2.1916 | 2.5057 | svm | BoxConstraint: 48.997 | | | | | | | | | KernelScale: 0.0045904 | | | | | | | | | Epsilon: 18.085 |
| 13 | Accept | 4.1439 | 0.048941 | 2.1916 | 2.5057 | svm | BoxConstraint: 985.69 | | | | | | | | | KernelScale: 0.0010988 | | | | | | | | | Epsilon: 449.48 |
| 14 | Accept | 2.2844 | 6.7538 | 2.1916 | 2.4806 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 287 | | | | | | | | | MinLeafSize: 63 |
| 15 | Accept | 4.1439 | 0.054943 | 2.1916 | 2.4806 | svm | BoxConstraint: 0.010812 | | | | | | | | | KernelScale: 1.2015 | | | | | | | | | Epsilon: 0.034209 |
| 16 | Accept | 4.1439 | 0.055455 | 2.1916 | 2.4806 | svm | BoxConstraint: 0.0021787 | | | | | | | | | KernelScale: 0.018209 | | | | | | | | | Epsilon: 443.71 |
| 17 | Accept | 2.2075 | 6.7931 | 2.1916 | 2.1942 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 283 | | | | | | | | | MinLeafSize: 17 |
| 18 | Accept | 2.6056 | 0.08425 | 2.1916 | 2.1942 | tree | MinLeafSize: 2 |
| 19 | Accept | 2.6056 | 0.087135 | 2.1916 | 2.1942 | tree | MinLeafSize: 2 |
| 20 | Accept | 2.7182 | 0.062848 | 2.1916 | 2.1942 | tree | MinLeafSize: 1 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 21 | Accept | 2.2402 | 6.8909 | 2.1916 | 2.2011 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 282 | | | | | | | | | MinLeafSize: 2 |
| 22 | Accept | 2.6056 | 0.059067 | 2.1916 | 2.2011 | tree | MinLeafSize: 2 |
| 23 | Accept | 2.3016 | 4.8177 | 2.1916 | 2.1911 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 202 | | | | | | | | | MinLeafSize: 9 |
| 24 | Accept | 4.1439 | 0.05258 | 2.1916 | 2.1911 | svm | BoxConstraint: 37.028 | | | | | | | | | KernelScale: 0.033731 | | | | | | | | | Epsilon: 0.2457 |
| 25 | Accept | 3.352 | 0.043391 | 2.1916 | 2.1911 | tree | MinLeafSize: 122 |
| 26 | Accept | 4.1439 | 0.062799 | 2.1916 | 2.1911 | svm | BoxConstraint: 0.01045 | | | | | | | | | KernelScale: 0.0024261 | | | | | | | | | Epsilon: 12.355 |
| 27 | Accept | 2.3188 | 5.1633 | 2.1916 | 2.1884 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 212 | | | | | | | | | MinLeafSize: 2 |
| 28 | Accept | 2.4271 | 5.8444 | 2.1916 | 2.1908 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 247 | | | | | | | | | MinLeafSize: 83 |
| 29 | Accept | 2.6056 | 0.05574 | 2.1916 | 2.1908 | tree | MinLeafSize: 2 |
| 30 | Accept | 4.1439 | 0.054692 | 2.1916 | 2.1908 | svm | BoxConstraint: 2.1296 | | | | | | | | | KernelScale: 3.2623 | | | | | | | | | Epsilon: 599.62 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 31 | Accept | 2.5241 | 0.051793 | 2.1916 | 2.1908 | tree | MinLeafSize: 8 |
| 32 | Accept | 2.6443 | 5.2572 | 2.1916 | 2.1969 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 229 | | | | | | | | | MinLeafSize: 52 |
| 33 | Accept | 2.2537 | 5.641 | 2.1916 | 2.1931 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 235 | | | | | | | | | MinLeafSize: 26 |
| 34 | Accept | 2.5448 | 0.053688 | 2.1916 | 2.1931 | tree | MinLeafSize: 19 |
| 35 | Accept | 2.4438 | 0.045817 | 2.1916 | 2.1931 | tree | MinLeafSize: 13 |
| 36 | Accept | 2.7182 | 0.062646 | 2.1916 | 2.1931 | tree | MinLeafSize: 1 |
| 37 | Accept | 2.4749 | 0.048072 | 2.1916 | 2.1931 | tree | MinLeafSize: 9 |
| 38 | Accept | 13.083 | 31.488 | 2.1916 | 2.1931 | svm | BoxConstraint: 5.2568 | | | | | | | | | KernelScale: 10.811 | | | | | | | | | Epsilon: 0.073361 |
| 39 | Accept | 2.2446 | 5.2866 | 2.1916 | 2.1952 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 214 | | | | | | | | | MinLeafSize: 4 |
| 40 | Accept | 3.0919 | 0.040315 | 2.1916 | 2.1952 | tree | MinLeafSize: 62 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 41 | Accept | 2.6335 | 6.4626 | 2.1916 | 2.1926 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 280 | | | | | | | | | MinLeafSize: 45 |
| 42 | Accept | 4.1439 | 0.048186 | 2.1916 | 2.1926 | svm | BoxConstraint: 0.093799 | | | | | | | | | KernelScale: 0.0053728 | | | | | | | | | Epsilon: 17.332 |
| 43 | Accept | 2.8766 | 0.075435 | 2.1916 | 2.1926 | svm | BoxConstraint: 0.20553 | | | | | | | | | KernelScale: 880.29 | | | | | | | | | Epsilon: 4.5637 |
| 44 | Accept | 2.2402 | 5.6507 | 2.1916 | 2.1944 | ensemble | Method: LSBoost | | | | | | | | | NumLearningCycles: 233 | | | | | | | | | MinLeafSize: 2 |
| 45 | Accept | 2.4576 | 5.4632 | 2.1916 | 2.1928 | ensemble | Method: Bag | | | | | | | | | NumLearningCycles: 232 | | | | | | | | | MinLeafSize: 27 |
| 46 | Accept | 3.003 | 0.069043 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.0010563 | | | | | | | | | KernelScale: 527.21 | | | | | | | | | Epsilon: 0.010074 |
| 47 | Accept | 4.1439 | 0.05544 | 2.1916 | 2.1928 | svm | BoxConstraint: 1.6452 | | | | | | | | | KernelScale: 880.96 | | | | | | | | | Epsilon: 656.96 |
| 48 | Accept | 11.118 | 31.888 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.001029 | | | | | | | | | KernelScale: 25.502 | | | | | | | | | Epsilon: 0.22713 |
| 49 | Accept | 3.0019 | 0.064077 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.012054 | | | | | | | | | KernelScale: 976.62 | | | | | | | | | Epsilon: 0.013474 |
| 50 | Accept | 4.1439 | 0.069826 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.045381 | | | | | | | | | KernelScale: 0.030659 | | | | | | | | | Epsilon: 0.021441 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 51 | Accept | 4.1439 | 0.050005 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.090287 | | | | | | | | | KernelScale: 69.941 | | | | | | | | | Epsilon: 125.56 |
| 52 | Accept | 4.1439 | 0.054745 | 2.1916 | 2.1928 | svm | BoxConstraint: 285.67 | | | | | | | | | KernelScale: 0.14938 | | | | | | | | | Epsilon: 764.19 |
| 53 | Accept | 2.8779 | 0.11876 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.064002 | | | | | | | | | KernelScale: 969.91 | | | | | | | | | Epsilon: 0.46473 |
| 54 | Accept | 12.921 | 18.315 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.019899 | | | | | | | | | KernelScale: 50.528 | | | | | | | | | Epsilon: 0.0091628 |
| 55 | Accept | 2.9117 | 0.076534 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.028436 | | | | | | | | | KernelScale: 919.02 | | | | | | | | | Epsilon: 1.2395 |
| 56 | Accept | 3.0276 | 0.064801 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.0073097 | | | | | | | | | KernelScale: 898.72 | | | | | | | | | Epsilon: 0.088715 |
| 57 | Accept | 7.1555 | 20.87 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.07913 | | | | | | | | | KernelScale: 100.43 | | | | | | | | | Epsilon: 0.78937 |
| 58 | Accept | 2.9075 | 0.077548 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.03913 | | | | | | | | | KernelScale: 956.28 | | | | | | | | | Epsilon: 1.1315 |
| 59 | Accept | 2.9168 | 0.068648 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.033583 | | | | | | | | | KernelScale: 973.75 | | | | | | | | | Epsilon: 2.1404 |
| 60 | Accept | 4.1439 | 0.053635 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.1278 | | | | | | | | | KernelScale: 899.12 | | | | | | | | | Epsilon: 36.993 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 61 | Accept | 2.9456 | 0.073895 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.022705 | | | | | | | | | KernelScale: 995.04 | | | | | | | | | Epsilon: 0.21977 |
| 62 | Accept | 4.1439 | 0.04979 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.0047868 | | | | | | | | | KernelScale: 0.1518 | | | | | | | | | Epsilon: 0.042601 |
| 63 | Accept | 2.9095 | 0.065115 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.033402 | | | | | | | | | KernelScale: 989.34 | | | | | | | | | Epsilon: 0.3073 |
| 64 | Accept | 4.1439 | 0.065248 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.056303 | | | | | | | | | KernelScale: 0.29988 | | | | | | | | | Epsilon: 0.10313 |
| 65 | Accept | 4.1439 | 0.050181 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.0040769 | | | | | | | | | KernelScale: 238.59 | | | | | | | | | Epsilon: 32.573 |
| 66 | Accept | 2.6802 | 2.1221 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.11739 | | | | | | | | | KernelScale: 555.21 | | | | | | | | | Epsilon: 0.048956 |
| 67 | Accept | 4.1439 | 0.055315 | 2.1916 | 2.1928 | svm | BoxConstraint: 772.51 | | | | | | | | | KernelScale: 0.016887 | | | | | | | | | Epsilon: 72.705 |
| 68 | Accept | 4.1439 | 0.063152 | 2.1916 | 2.1928 | svm | BoxConstraint: 63.153 | | | | | | | | | KernelScale: 0.0080065 | | | | | | | | | Epsilon: 481.39 |
| 69 | Accept | 4.1439 | 0.054083 | 2.1916 | 2.1928 | svm | BoxConstraint: 4.117 | | | | | | | | | KernelScale: 73.496 | | | | | | | | | Epsilon: 121.74 |
| 70 | Accept | 4.1439 | 0.05377 | 2.1916 | 2.1928 | svm | BoxConstraint: 30.398 | | | | | | | | | KernelScale: 0.12159 | | | | | | | | | Epsilon: 64.06 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 71 | Accept | 4.1439 | 0.053553 | 2.1916 | 2.1928 | svm | BoxConstraint: 3.9304 | | | | | | | | | KernelScale: 871.88 | | | | | | | | | Epsilon: 23.7 |
| 72 | Accept | 4.1439 | 0.050525 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.031734 | | | | | | | | | KernelScale: 0.28247 | | | | | | | | | Epsilon: 0.0097239 |
| 73 | Accept | 4.1439 | 0.068567 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.021528 | | | | | | | | | KernelScale: 0.001858 | | | | | | | | | Epsilon: 283.71 |
| 74 | Accept | 4.1439 | 0.055336 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.024702 | | | | | | | | | KernelScale: 0.055101 | | | | | | | | | Epsilon: 84.374 |
| 75 | Accept | 2.8707 | 0.095257 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.070484 | | | | | | | | | KernelScale: 928.16 | | | | | | | | | Epsilon: 0.11681 |
| 76 | Accept | 4.1439 | 0.059476 | 2.1916 | 2.1928 | svm | BoxConstraint: 636.13 | | | | | | | | | KernelScale: 0.0020368 | | | | | | | | | Epsilon: 2.0625 |
| 77 | Accept | 2.8682 | 0.10867 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.059284 | | | | | | | | | KernelScale: 888.99 | | | | | | | | | Epsilon: 0.1389 |
| 78 | Accept | 2.7111 | 0.59286 | 2.1916 | 2.1928 | svm | BoxConstraint: 2.4776 | | | | | | | | | KernelScale: 998.2 | | | | | | | | | Epsilon: 1.5291 |
| 79 | Accept | 2.7625 | 0.45668 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.91288 | | | | | | | | | KernelScale: 996.35 | | | | | | | | | Epsilon: 0.16968 |
| 80 | Accept | 3.2211 | 0.058812 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.0011498 | | | | | | | | | KernelScale: 989.38 | | | | | | | | | Epsilon: 0.0091368 |
|=========================================================================================================================================| | Iter | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |=========================================================================================================================================| | 81 | Accept | 4.1439 | 0.05754 | 2.1916 | 2.1928 | svm | BoxConstraint: 26.543 | | | | | | | | | KernelScale: 0.0016089 | | | | | | | | | Epsilon: 0.68659 |
| 82 | Accept | 4.1439 | 0.055356 | 2.1916 | 2.1928 | svm | BoxConstraint: 129.11 | | | | | | | | | KernelScale: 0.044504 | | | | | | | | | Epsilon: 3.7911 |
| 83 | Accept | 2.7643 | 0.51644 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.82852 | | | | | | | | | KernelScale: 990.02 | | | | | | | | | Epsilon: 0.013169 |
| 84 | Accept | 4.1439 | 0.05615 | 2.1916 | 2.1928 | svm | BoxConstraint: 53.003 | | | | | | | | | KernelScale: 3.9941 | | | | | | | | | Epsilon: 318.78 |
| 85 | Accept | 4.1439 | 0.054645 | 2.1916 | 2.1928 | svm | BoxConstraint: 10.848 | | | | | | | | | KernelScale: 0.2138 | | | | | | | | | Epsilon: 876.72 |
| 86 | Accept | 2.8797 | 0.077707 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.063788 | | | | | | | | | KernelScale: 999.56 | | | | | | | | | Epsilon: 0.24966 |
| 87 | Accept | 4.1439 | 0.056472 | 2.1916 | 2.1928 | svm | BoxConstraint: 29.921 | | | | | | | | | KernelScale: 300.51 | | | | | | | | | Epsilon: 872.64 |
| 88 | Accept | 4.1439 | 0.053269 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.5701 | | | | | | | | | KernelScale: 0.020421 | | | | | | | | | Epsilon: 282.76 |
| 89 | Accept | 4.1439 | 0.054778 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.60472 | | | | | | | | | KernelScale: 0.0052641 | | | | | | | | | Epsilon: 0.11831 |
| 90 | Accept | 2.8676 | 0.097394 | 2.1916 | 2.1928 | svm | BoxConstraint: 0.11411 | | | | | | | | | KernelScale: 977.02 | | | | | | | | | Epsilon: 0.090725 |
__________________________________________________________ Optimization completed. Total iterations: 90 Total elapsed time: 589.6892 seconds Total time for training and validation: 245.2123 seconds Best observed learner is an ensemble model with: Method: LSBoost NumLearningCycles: 278 MinLeafSize: 13 Observed log(1 + valLoss): 2.1916 Time for training and validation: 6.4368 seconds Best estimated learner (returned model) is an ensemble model with: Method: LSBoost NumLearningCycles: 278 MinLeafSize: 13 Estimated log(1 + valLoss): 2.1928 Estimated time for training and validation: 5.8977 seconds Documentation for fitrauto display
Итоговая модель возвращена fitrauto соответствует лучшему предполагаемому ученику. Прежде, чем возвратить модель, функция переобучает его с помощью целых обучающих данных (carsTrain), перечисленный Learner (или модель) тип и отображенные гиперзначения параметров.
Оцените эффективность набора тестов
Оцените эффективность модели на наборе тестов. testError основан на среднеквадратической ошибке (MSE) набора тестов. Меньшие значения MSE указывают на лучшую эффективность.
testMSE = loss(Mdl,carsTest,'MPG');
testError = log(1 + testMSE)testError = 2.3194
Используйте fitrauto автоматически выбрать модель регрессии оптимизированными гиперпараметрами, учитывая предиктор и данные об ответе, хранимые в отдельных переменных.
Загрузка данных
Загрузите carbig набор данных, который содержит измерения автомобилей, сделанных в 1970-х и в начале 1980-х.
load carbigСоздайте матричный X содержа переменные предикторы Acceleration, Cylinders, и так далее. Сохраните переменную отклика MPG в переменной Y.
X = [Acceleration Cylinders Displacement Weight]; Y = MPG;
Создайте переменную, указывающую, какие предикторы являются категориальными. Cylinders единственная категориальная переменная в X.
categoricalVars = [false true false false];
Данные о разделе
Разделите данные в наборы обучающих данных и наборы тестов. Используйте приблизительно 80% наблюдений для выбора модели и настраивающего процесса гиперпараметра, и 20% наблюдений, чтобы проверить производительность итоговой модели, возвращенной fitrauto. Используйте cvpartition разделить данные.
rng('default') % For reproducibility of the partition c = cvpartition(length(Y),'Holdout',0.20); trainingIdx = training(c); % Indices for the training set XTrain = X(trainingIdx,:); YTrain = Y(trainingIdx); testIdx = test(c); % Indices for the test set XTest = X(testIdx,:); YTest = Y(testIdx);
Запустите fitrauto
Передайте обучающие данные fitrauto. По умолчанию, fitrauto определяет соответствующую модель (или ученик) типы, чтобы попробовать, использует Байесовую оптимизацию, чтобы найти хорошие гиперзначения параметров для тех моделей и возвращает обученную модель Mdl с лучшей ожидаемой эффективностью. Задайте категориальные предикторы и запуститесь, оптимизация параллельно (требует Parallel Computing Toolbox™). Возвратите второй выход OptimizationResults это содержит детали Байесовой оптимизации.
Ожидайте, что этот процесс займет время. По умолчанию, fitrauto предоставляет график оптимизации и итеративное отображение результатов оптимизации. Для получения дополнительной информации о том, как интерпретировать эти результаты, смотрите Многословное Отображение.
options = struct('UseParallel',true); [Mdl,OptimizationResults] = fitrauto(XTrain,YTrain, ... 'CategoricalPredictors',categoricalVars, ... 'HyperparameterOptimizationOptions',options);
Starting parallel pool (parpool) using the 'local' profile ... Connected to the parallel pool (number of workers: 6). Copying objective function to workers... Done copying objective function to workers.
Learner types to explore: ensemble, svm, tree Total iterations (MaxObjectiveEvaluations): 90 Total time (MaxTime): Inf
|===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 1 | 5 | Best | 3.0205 | 1.7491 | 3.0205 | 3.0329 | tree | MinLeafSize: 6 | | 2 | 5 | Accept | 3.0453 | 1.6641 | 3.0205 | 3.0329 | tree | MinLeafSize: 5 |
| 3 | 4 | Accept | 4.143 | 2.6491 | 3.0205 | 3.0329 | svm | BoxConstraint: 336.91 | | | | | | | | | | KernelScale: 0.0018275 | | | | | | | | | | Epsilon: 0.1074 | | 4 | 4 | Accept | 4.1434 | 7.5491 | 3.0205 | 3.0329 | ensemble | Method: Bag | | | | | | | | | | NumLearningCycles: 257 | | | | | | | | | | MinLeafSize: 156 |
| 5 | 3 | Best | 2.9188 | 8.6194 | 2.9188 | 3.0329 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 287 | | | | | | | | | | MinLeafSize: 1 | | 6 | 3 | Accept | 4.143 | 0.83485 | 2.9188 | 3.0329 | svm | BoxConstraint: 346.92 | | | | | | | | | | KernelScale: 0.032493 | | | | | | | | | | Epsilon: 0.23974 |
| 7 | 6 | Accept | 2.9275 | 0.19147 | 2.9188 | 2.9276 | svm | BoxConstraint: 0.033068 | | | | | | | | | | KernelScale: 585.38 | | | | | | | | | | Epsilon: 4.6993 |
| 8 | 4 | Accept | 4.143 | 0.09353 | 2.9188 | 2.9276 | svm | BoxConstraint: 985.69 | | | | | | | | | | KernelScale: 0.0010988 | | | | | | | | | | Epsilon: 449.48 | | 9 | 4 | Accept | 4.143 | 0.62222 | 2.9188 | 2.9276 | svm | BoxConstraint: 0.04588 | | | | | | | | | | KernelScale: 0.33917 | | | | | | | | | | Epsilon: 0.073755 | | 10 | 4 | Accept | 3.0205 | 0.21301 | 2.9188 | 2.9276 | tree | MinLeafSize: 6 |
|===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 11 | 6 | Best | 2.9167 | 7.3685 | 2.9167 | 2.9276 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 287 | | | | | | | | | | MinLeafSize: 63 |
| 12 | 4 | Accept | 3.6673 | 22.826 | 2.8696 | 2.8697 | svm | BoxConstraint: 0.033502 | | | | | | | | | | KernelScale: 153.38 | | | | | | | | | | Epsilon: 0.093672 | | 13 | 4 | Best | 2.8696 | 8.0371 | 2.8696 | 2.8697 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 283 | | | | | | | | | | MinLeafSize: 17 | | 14 | 4 | Accept | 2.8696 | 7.6155 | 2.8696 | 2.8697 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 283 | | | | | | | | | | MinLeafSize: 17 |
| 15 | 3 | Accept | 2.8696 | 8.2039 | 2.8696 | 2.8697 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 283 | | | | | | | | | | MinLeafSize: 17 | | 16 | 3 | Accept | 3.1971 | 0.1933 | 2.8696 | 2.8697 | tree | MinLeafSize: 2 |
| 17 | 6 | Accept | 3.0139 | 0.12079 | 2.8696 | 2.8697 | tree | MinLeafSize: 34 |
| 18 | 5 | Accept | 4.143 | 0.23444 | 2.8696 | 2.8697 | svm | BoxConstraint: 0.0023916 | | | | | | | | | | KernelScale: 0.0049969 | | | | | | | | | | Epsilon: 3.0552 | | 19 | 5 | Accept | 3.3225 | 0.19712 | 2.8696 | 2.8697 | tree | MinLeafSize: 122 |
| 20 | 3 | Accept | 2.8717 | 5.5602 | 2.8217 | 2.8697 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 282 | | | | | | | | | | MinLeafSize: 2 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 21 | 3 | Best | 2.8217 | 4.2702 | 2.8217 | 2.8697 | ensemble | Method: Bag | | | | | | | | | | NumLearningCycles: 202 | | | | | | | | | | MinLeafSize: 9 | | 22 | 3 | Accept | 4.143 | 0.11628 | 2.8217 | 2.8697 | svm | BoxConstraint: 37.028 | | | | | | | | | | KernelScale: 0.033731 | | | | | | | | | | Epsilon: 0.2457 |
| 23 | 6 | Accept | 4.143 | 0.067367 | 2.8217 | 2.8697 | svm | BoxConstraint: 0.01045 | | | | | | | | | | KernelScale: 0.0024261 | | | | | | | | | | Epsilon: 12.355 |
| 24 | 5 | Accept | 3.1971 | 0.094668 | 2.8217 | 2.8697 | tree | MinLeafSize: 2 | | 25 | 5 | Accept | 4.143 | 0.10279 | 2.8217 | 2.8697 | svm | BoxConstraint: 308.5 | | | | | | | | | | KernelScale: 0.015174 | | | | | | | | | | Epsilon: 0.53501 |
| 26 | 5 | Accept | 4.143 | 0.07812 | 2.8217 | 2.8697 | svm | BoxConstraint: 2.1296 | | | | | | | | | | KernelScale: 3.2623 | | | | | | | | | | Epsilon: 599.62 |
| 27 | 6 | Accept | 11.41 | 32.991 | 2.8217 | 2.8697 | svm | BoxConstraint: 0.0054638 | | | | | | | | | | KernelScale: 45.011 | | | | | | | | | | Epsilon: 5.0385 |
| 28 | 6 | Accept | 2.8657 | 5.3498 | 2.8217 | 2.8221 | ensemble | Method: Bag | | | | | | | | | | NumLearningCycles: 229 | | | | | | | | | | MinLeafSize: 52 |
| 29 | 3 | Accept | 2.8689 | 6.3959 | 2.8217 | 2.8221 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 235 | | | | | | | | | | MinLeafSize: 26 | | 30 | 3 | Accept | 2.8689 | 5.5649 | 2.8217 | 2.8221 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 235 | | | | | | | | | | MinLeafSize: 26 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 31 | 3 | Accept | 2.9197 | 0.043492 | 2.8217 | 2.8221 | tree | MinLeafSize: 19 | | 32 | 3 | Accept | 2.9403 | 0.050907 | 2.8217 | 2.8221 | tree | MinLeafSize: 13 |
| 33 | 6 | Accept | 4.143 | 0.1117 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0013002 | | | | | | | | | | KernelScale: 365.07 | | | | | | | | | | Epsilon: 533.39 |
| 34 | 5 | Accept | 4.1924 | 16.905 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0057208 | | | | | | | | | | KernelScale: 143.79 | | | | | | | | | | Epsilon: 4.0917 | | 35 | 5 | Accept | 2.9804 | 0.16413 | 2.8217 | 2.8221 | tree | MinLeafSize: 8 |
| 36 | 4 | Accept | 2.8842 | 4.4972 | 2.8217 | 2.8221 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 214 | | | | | | | | | | MinLeafSize: 4 | | 37 | 4 | Accept | 3.112 | 0.40292 | 2.8217 | 2.8221 | tree | MinLeafSize: 62 |
| 38 | 3 | Accept | 2.8686 | 5.942 | 2.8217 | 2.8221 | ensemble | Method: Bag | | | | | | | | | | NumLearningCycles: 285 | | | | | | | | | | MinLeafSize: 45 | | 39 | 3 | Accept | 4.143 | 0.048389 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.093799 | | | | | | | | | | KernelScale: 0.0053728 | | | | | | | | | | Epsilon: 17.332 |
| 40 | 6 | Accept | 2.9487 | 0.053171 | 2.8217 | 2.8221 | tree | MinLeafSize: 27 |
|===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 41 | 3 | Accept | 12.196 | 29.49 | 2.8217 | 2.8221 | svm | BoxConstraint: 86.083 | | | | | | | | | | KernelScale: 52.727 | | | | | | | | | | Epsilon: 8.3179 | | 42 | 3 | Accept | 2.8717 | 4.5788 | 2.8217 | 2.8221 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 233 | | | | | | | | | | MinLeafSize: 2 | | 43 | 3 | Accept | 2.9093 | 0.24973 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.034974 | | | | | | | | | | KernelScale: 588.77 | | | | | | | | | | Epsilon: 3.8683 | | 44 | 3 | Accept | 2.9804 | 0.18263 | 2.8217 | 2.8221 | tree | MinLeafSize: 8 |
| 45 | 6 | Accept | 4.143 | 0.10875 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.084355 | | | | | | | | | | KernelScale: 0.052988 | | | | | | | | | | Epsilon: 76.921 |
| 46 | 5 | Accept | 2.8478 | 4.7428 | 2.8217 | 2.8221 | ensemble | Method: LSBoost | | | | | | | | | | NumLearningCycles: 229 | | | | | | | | | | MinLeafSize: 8 | | 47 | 5 | Accept | 4.143 | 1.2887 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0036358 | | | | | | | | | | KernelScale: 4.7627 | | | | | | | | | | Epsilon: 20.208 |
| 48 | 4 | Accept | 3.2214 | 16.267 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.069952 | | | | | | | | | | KernelScale: 207.68 | | | | | | | | | | Epsilon: 0.092526 | | 49 | 4 | Accept | 2.924 | 0.18896 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0095751 | | | | | | | | | | KernelScale: 358.95 | | | | | | | | | | Epsilon: 4.7526 |
| 50 | 3 | Accept | 3.1542 | 15.88 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.028095 | | | | | | | | | | KernelScale: 184.52 | | | | | | | | | | Epsilon: 0.09847 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 51 | 3 | Accept | 2.9143 | 3.0279 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0033005 | | | | | | | | | | KernelScale: 252.81 | | | | | | | | | | Epsilon: 2.6159 |
| 52 | 6 | Accept | 10.06 | 18.169 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.043122 | | | | | | | | | | KernelScale: 74.674 | | | | | | | | | | Epsilon: 0.071781 |
| 53 | 2 | Accept | 2.8989 | 7.2493 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.014817 | | | | | | | | | | KernelScale: 247.68 | | | | | | | | | | Epsilon: 2.5942 | | 54 | 2 | Accept | 2.9049 | 0.55744 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.033022 | | | | | | | | | | KernelScale: 505.18 | | | | | | | | | | Epsilon: 0.1266 | | 55 | 2 | Accept | 2.9804 | 0.066427 | 2.8217 | 2.8221 | tree | MinLeafSize: 8 | | 56 | 2 | Accept | 2.9032 | 0.17339 | 2.8217 | 2.8221 | tree | MinLeafSize: 17 | | 57 | 2 | Accept | 4.143 | 0.058535 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0011341 | | | | | | | | | | KernelScale: 0.0017464 | | | | | | | | | | Epsilon: 0.012532 |
| 58 | 6 | Accept | 2.9268 | 0.13315 | 2.8217 | 2.8221 | svm | BoxConstraint: 0.0042653 | | | | | | | | | | KernelScale: 319.4 | | | | | | | | | | Epsilon: 4.5985 |
| 59 | 4 | Accept | 2.9081 | 1.8508 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0012679 | | | | | | | | | | KernelScale: 229.31 | | | | | | | | | | Epsilon: 0.075286 | | 60 | 4 | Accept | 4.143 | 0.059851 | 2.8217 | 2.8227 | svm | BoxConstraint: 275.76 | | | | | | | | | | KernelScale: 0.034549 | | | | | | | | | | Epsilon: 6.2312 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 61 | 4 | Accept | 2.8335 | 4.6933 | 2.8217 | 2.8227 | ensemble | Method: Bag | | | | | | | | | | NumLearningCycles: 219 | | | | | | | | | | MinLeafSize: 26 |
| 62 | 5 | Accept | 2.9049 | 1.902 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0071219 | | | | | | | | | | KernelScale: 278.65 | | | | | | | | | | Epsilon: 2.7464 |
| 63 | 3 | Accept | 2.8816 | 15.271 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.044779 | | | | | | | | | | KernelScale: 253.31 | | | | | | | | | | Epsilon: 0.15109 | | 64 | 3 | Accept | 2.8773 | 9.1951 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.042581 | | | | | | | | | | KernelScale: 336.99 | | | | | | | | | | Epsilon: 0.072146 | | 65 | 3 | Accept | 2.9573 | 3.597 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.035397 | | | | | | | | | | KernelScale: 251.22 | | | | | | | | | | Epsilon: 5.8103 |
| 66 | 6 | Accept | 2.9045 | 0.8479 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0017256 | | | | | | | | | | KernelScale: 280.49 | | | | | | | | | | Epsilon: 0.17061 |
| 67 | 5 | Accept | 3.1507 | 0.089958 | 2.8217 | 2.8227 | tree | MinLeafSize: 3 | | 68 | 5 | Accept | 3.1971 | 0.14914 | 2.8217 | 2.8227 | tree | MinLeafSize: 2 |
| 69 | 5 | Accept | 4.143 | 30.354 | 2.8217 | 2.8227 | svm | BoxConstraint: 1.3468 | | | | | | | | | | KernelScale: 9.6762 | | | | | | | | | | Epsilon: 0.023868 |
| 70 | 5 | Accept | 2.9037 | 1.2103 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0030905 | | | | | | | | | | KernelScale: 288.83 | | | | | | | | | | Epsilon: 0.089541 |
|===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 71 | 4 | Accept | 6.6283 | 17.347 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0017058 | | | | | | | | | | KernelScale: 104.21 | | | | | | | | | | Epsilon: 0.065687 | | 72 | 4 | Accept | 2.9655 | 15.866 | 2.8217 | 2.8227 | svm | BoxConstraint: 16.694 | | | | | | | | | | KernelScale: 563.25 | | | | | | | | | | Epsilon: 0.82854 |
| 73 | 4 | Accept | 3.0653 | 0.064937 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0014988 | | | | | | | | | | KernelScale: 637.21 | | | | | | | | | | Epsilon: 0.082183 |
| 74 | 2 | Accept | 5.9041 | 19.341 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0015248 | | | | | | | | | | KernelScale: 115.07 | | | | | | | | | | Epsilon: 0.14178 | | 75 | 2 | Accept | 2.874 | 14.077 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.049938 | | | | | | | | | | KernelScale: 249.2 | | | | | | | | | | Epsilon: 2.3027 | | 76 | 2 | Accept | 2.9116 | 0.1932 | 2.8217 | 2.8227 | svm | BoxConstraint: 0.0015667 | | | | | | | | | | KernelScale: 364.11 | | | | | | | | | | Epsilon: 0.046357 |
| 77 | 6 | Accept | 2.9266 | 0.089378 | 2.8217 | 2.8203 | svm | BoxConstraint: 0.008711 | | | | | | | | | | KernelScale: 689.75 | | | | | | | | | | Epsilon: 0.11038 |
| 78 | 3 | Accept | 2.9134 | 0.2501 | 2.8217 | 2.7031 | svm | BoxConstraint: 0.0013447 | | | | | | | | | | KernelScale: 362.68 | | | | | | | | | | Epsilon: 0.096474 | | 79 | 3 | Accept | 4.143 | 0.086465 | 2.8217 | 2.7031 | svm | BoxConstraint: 37.006 | | | | | | | | | | KernelScale: 0.031201 | | | | | | | | | | Epsilon: 8.5325 | | 80 | 3 | Accept | 2.9804 | 0.070321 | 2.8217 | 2.7031 | tree | MinLeafSize: 8 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 81 | 3 | Accept | 4.143 | 0.057551 | 2.8217 | 2.7031 | svm | BoxConstraint: 8.2928 | | | | | | | | | | KernelScale: 0.22318 | | | | | | | | | | Epsilon: 0.35272 |
| 82 | 6 | Accept | 2.905 | 0.35685 | 2.8217 | 2.6899 | svm | BoxConstraint: 0.0049863 | | | | | | | | | | KernelScale: 405.18 | | | | | | | | | | Epsilon: 0.20248 |
| 83 | 4 | Accept | 4.143 | 0.057428 | 2.8217 | 2.6899 | svm | BoxConstraint: 0.0035019 | | | | | | | | | | KernelScale: 10.124 | | | | | | | | | | Epsilon: 22.114 | | 84 | 4 | Accept | 2.9968 | 0.053485 | 2.8217 | 2.6899 | tree | MinLeafSize: 31 | | 85 | 4 | Accept | 2.9487 | 0.067551 | 2.8217 | 2.6899 | tree | MinLeafSize: 27 |
| 86 | 2 | Accept | 11.192 | 19.605 | 2.8217 | 2.7382 | svm | BoxConstraint: 86.675 | | | | | | | | | | KernelScale: 92.212 | | | | | | | | | | Epsilon: 2.4057 | | 87 | 2 | Accept | 2.8848 | 6.0635 | 2.8217 | 2.7382 | svm | BoxConstraint: 0.015422 | | | | | | | | | | KernelScale: 295.63 | | | | | | | | | | Epsilon: 0.10658 | | 88 | 2 | Accept | 2.8919 | 2.8002 | 2.8217 | 2.7382 | svm | BoxConstraint: 0.013027 | | | | | | | | | | KernelScale: 316.74 | | | | | | | | | | Epsilon: 0.1048 |
| 89 | 6 | Accept | 2.9712 | 0.073966 | 2.8217 | 2.7363 | svm | BoxConstraint: 0.00197 | | | | | | | | | | KernelScale: 560.31 | | | | | | | | | | Epsilon: 0.42707 |
| 90 | 5 | Accept | 3.0045 | 0.1149 | 2.8217 | 2.7363 | tree | MinLeafSize: 45 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 91 | 5 | Accept | 3.031 | 0.041383 | 2.8217 | 2.7363 | tree | MinLeafSize: 61 |
__________________________________________________________ Optimization completed. Total iterations: 91 Total elapsed time: 201.923 seconds Total time for training and validation: 436.1019 seconds Best observed learner is an ensemble model with: Method: Bag NumLearningCycles: 202 MinLeafSize: 9 Observed log(1 + valLoss): 2.8217 Time for training and validation: 4.2702 seconds Best estimated learner (returned model) is an svm model with: BoxConstraint: 0.0013447 KernelScale: 362.68 Epsilon: 0.096474 Estimated log(1 + valLoss): 2.7363 Estimated time for training and validation: 0.29514 seconds Documentation for fitrauto display
Итоговая модель возвращена fitrauto соответствует лучшему предполагаемому ученику. Прежде, чем возвратить модель, функция переобучает его с помощью целых обучающих данных (XTrain и YTrain), перечисленный Learner (или модель) тип и отображенные гиперзначения параметров.
Оцените эффективность набора тестов
Оцените эффективность модели на наборе тестов. testError основан на среднеквадратической ошибке (MSE) набора тестов. Меньшие значения MSE указывают на лучшую эффективность.
testMSE = loss(Mdl,XTest,YTest); testError = log(1 + testMSE)
testError = 2.9873
Используйте fitrauto автоматически выбрать модель регрессии оптимизированными гиперпараметрами, учитывая предиктор и данные об ответе, хранимые в таблице. Сравните эффективность получившейся модели регрессии к эффективности простой модели линейной регрессии, созданной с fitlm.
Загрузка и данные о разделе
Загрузите carbig набор данных, который содержит измерения автомобилей, сделанных в 1970-х и в начале 1980-х. Преобразуйте Cylinders переменная к categorical переменная. Составьте таблицу, содержащую переменные предикторы Acceleration, Cylinders, Displacement, и так далее, а также переменная отклика MPG.
load carbig Cylinders = categorical(Cylinders); cars = table(Acceleration,Cylinders,Displacement, ... Horsepower,Model_Year,Origin,Weight,MPG);
Разделите данные в наборы обучающих данных и наборы тестов. Используйте приблизительно 80% наблюдений для обучения и 20% наблюдений для тестирования. Используйте cvpartition разделить данные.
rng('default') % For reproducibility of the data partition c = cvpartition(length(MPG),'Holdout',0.2); trainingIdx = training(c); % Training set indices carsTrain = cars(trainingIdx,:); testIdx = test(c); % Test set indices carsTest = cars(testIdx,:);
Запустите fitrauto
Передайте обучающие данные fitrauto. По умолчанию, fitrauto определяет соответствующие типы модели, чтобы попробовать, использует Байесовую оптимизацию, чтобы найти хорошие гиперзначения параметров и возвращает обученную модель autoMdl с лучшей ожидаемой эффективностью. Задайте, чтобы оптимизировать по всем optimizable гиперпараметрам и запуститься, оптимизация параллельно (требует Parallel Computing Toolbox™).
Ожидайте, что этот процесс займет время. По умолчанию, fitrauto предоставляет график оптимизации и итеративное отображение результатов оптимизации. Для получения дополнительной информации о том, как интерпретировать эти результаты, смотрите Многословное Отображение.
options = struct('UseParallel',true); autoMdl = fitrauto(carsTrain,'MPG','OptimizeHyperparameters','all', ... 'HyperparameterOptimizationOptions',options);
Starting parallel pool (parpool) using the 'local' profile ... Connected to the parallel pool (number of workers: 6). Copying objective function to workers... Done copying objective function to workers. Learner types to explore: ensemble, svm, tree Total iterations (MaxObjectiveEvaluations): 90 Total time (MaxTime): Inf |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 1 | 4 | Accept | 3.5168 | 2.3522 | 2.6193 | 2.6197 | tree | MinLeafSize: 38 | | | | | | | | | | MaxNumSplits: 2 | | | | | | | | | | NumVariablesToSample: 1 | | 2 | 4 | Accept | 2.6633 | 2.3211 | 2.6193 | 2.6197 | tree | MinLeafSize: 1 | | | | | | | | | | MaxNumSplits: 44 | | | | | | | | | | NumVariablesToSample: 4 | | 3 | 4 | Best | 2.6193 | 2.3426 | 2.6193 | 2.6197 | tree | MinLeafSize: 29 | | | | | | | | | | MaxNumSplits: 52 | | | | | | | | | | NumVariablesToSample: 6 | | 4 | 4 | Accept | 4.1439 | 3.798 | 2.6193 | 2.6197 | svm | BoxConstraint: 0.010718 | | | | | | | | | | KernelScale: 1.7547 | | | | | | | | | | Epsilon: 182.6 | | 5 | 2 | Accept | 2.3998 | 8.4115 | 2.2082 | 2.6197 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.64294 | | | | | | | | | | MinLeafSize: 39 | | | | | | | | | | NumVariablesToSample: NaN | | 6 | 2 | Best | 2.2082 | 9.4573 | 2.2082 | 2.6197 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.033855 | | | | | | | | | | MinLeafSize: 6 | | | | | | | | | | NumVariablesToSample: NaN | | 7 | 2 | Accept | 4.1439 | 0.37564 | 2.2082 | 2.6197 | svm | BoxConstraint: 0.012677 | | | | | | | | | | KernelScale: 351.81 | | | | | | | | | | Epsilon: 140.99 | | 8 | 6 | Accept | 4.1439 | 1.1014 | 2.2082 | 2.6197 | svm | BoxConstraint: 37.191 | | | | | | | | | | KernelScale: 21.113 | | | | | | | | | | Epsilon: 33.874 | | 9 | 6 | Accept | 2.7394 | 1.8778 | 2.2082 | 2.6197 | svm | BoxConstraint: 0.057859 | | | | | | | | | | KernelScale: 448.87 | | | | | | | | | | Epsilon: 4.2169 | | 10 | 3 | Accept | 2.5987 | 6.4235 | 2.2082 | 2.4798 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.89898 | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: NaN | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 11 | 3 | Accept | 3.2336 | 6.93 | 2.2082 | 2.4798 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.56281 | | | | | | | | | | MinLeafSize: 123 | | | | | | | | | | NumVariablesToSample: NaN | | 12 | 3 | Accept | 2.682 | 6.4489 | 2.2082 | 2.4798 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 51 | | | | | | | | | | NumVariablesToSample: 2 | | 13 | 3 | Accept | 2.4795 | 0.40654 | 2.2082 | 2.4798 | tree | MinLeafSize: 6 | | | | | | | | | | MaxNumSplits: 32 | | | | | | | | | | NumVariablesToSample: 5 | | 14 | 5 | Accept | 4.1439 | 0.28349 | 2.2082 | 2.4798 | svm | BoxConstraint: 297.35 | | | | | | | | | | KernelScale: 0.87756 | | | | | | | | | | Epsilon: 0.043798 | | 15 | 5 | Accept | 2.845 | 0.3422 | 2.2082 | 2.4798 | svm | BoxConstraint: 0.0027083 | | | | | | | | | | KernelScale: 413.17 | | | | | | | | | | Epsilon: 0.13572 | | 16 | 5 | Accept | 2.7106 | 5.6397 | 2.2082 | 2.3735 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.74839 | | | | | | | | | | MinLeafSize: 88 | | | | | | | | | | NumVariablesToSample: NaN | | 17 | 3 | Accept | 6.0492 | 4.8396 | 2.2082 | 2.3735 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.0010498 | | | | | | | | | | MinLeafSize: 130 | | | | | | | | | | NumVariablesToSample: NaN | | 18 | 3 | Accept | 2.2932 | 5.4011 | 2.2082 | 2.3735 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.10542 | | | | | | | | | | MinLeafSize: 57 | | | | | | | | | | NumVariablesToSample: NaN | | 19 | 3 | Accept | 2.6686 | 0.22924 | 2.2082 | 2.3735 | tree | MinLeafSize: 5 | | | | | | | | | | MaxNumSplits: 7 | | | | | | | | | | NumVariablesToSample: 5 | | 20 | 6 | Accept | 4.1439 | 1.5528 | 2.2082 | 2.3735 | svm | BoxConstraint: 0.07294 | | | | | | | | | | KernelScale: 761.22 | | | | | | | | | | Epsilon: 31.544 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 21 | 4 | Accept | 4.143 | 0.10249 | 2.2082 | 2.3735 | tree | MinLeafSize: 132 | | | | | | | | | | MaxNumSplits: 8 | | | | | | | | | | NumVariablesToSample: 5 | | 22 | 4 | Accept | 4.143 | 0.31889 | 2.2082 | 2.3735 | tree | MinLeafSize: 138 | | | | | | | | | | MaxNumSplits: 3 | | | | | | | | | | NumVariablesToSample: 7 | | 23 | 4 | Accept | 3.5024 | 0.16777 | 2.2082 | 2.3735 | tree | MinLeafSize: 83 | | | | | | | | | | MaxNumSplits: 41 | | | | | | | | | | NumVariablesToSample: 2 | | 24 | 2 | Accept | 4.1439 | 33.887 | 2.2082 | 2.3735 | svm | BoxConstraint: 0.15265 | | | | | | | | | | KernelScale: 1.4893 | | | | | | | | | | Epsilon: 0.44287 | | 25 | 2 | Accept | 2.3583 | 5.6469 | 2.2082 | 2.3735 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: 2 | | 26 | 2 | Accept | 4.1439 | 0.08045 | 2.2082 | 2.3735 | svm | BoxConstraint: 0.0050384 | | | | | | | | | | KernelScale: 0.18651 | | | | | | | | | | Epsilon: 11.818 | | 27 | 6 | Accept | 4.1439 | 0.11643 | 2.2082 | 2.3735 | svm | BoxConstraint: 0.19519 | | | | | | | | | | KernelScale: 0.48473 | | | | | | | | | | Epsilon: 0.02267 | | 28 | 6 | Accept | 2.6334 | 0.69581 | 2.2082 | 2.3735 | tree | MinLeafSize: 6 | | | | | | | | | | MaxNumSplits: 43 | | | | | | | | | | NumVariablesToSample: 2 | | 29 | 2 | Accept | 5.9862 | 5.4794 | 2.2082 | 2.3735 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.001143 | | | | | | | | | | MinLeafSize: 104 | | | | | | | | | | NumVariablesToSample: NaN | | 30 | 2 | Accept | 2.2456 | 7.9201 | 2.2082 | 2.3735 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 12 | | | | | | | | | | NumVariablesToSample: 7 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 31 | 2 | Accept | 2.9745 | 7.6297 | 2.2082 | 2.3735 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.010155 | | | | | | | | | | MinLeafSize: 13 | | | | | | | | | | NumVariablesToSample: NaN | | 32 | 2 | Accept | 2.6819 | 6.0671 | 2.2082 | 2.3735 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 57 | | | | | | | | | | NumVariablesToSample: 5 | | 33 | 2 | Accept | 2.927 | 0.11096 | 2.2082 | 2.3735 | tree | MinLeafSize: 1 | | | | | | | | | | MaxNumSplits: 123 | | | | | | | | | | NumVariablesToSample: 2 | | 34 | 4 | Accept | 4.1439 | 0.11416 | 2.2082 | 2.3735 | svm | BoxConstraint: 2.1967 | | | | | | | | | | KernelScale: 0.02117 | | | | | | | | | | Epsilon: 0.20631 | | 35 | 4 | Accept | 2.9904 | 0.096707 | 2.2082 | 2.3735 | tree | MinLeafSize: 44 | | | | | | | | | | MaxNumSplits: 265 | | | | | | | | | | NumVariablesToSample: 2 | | 36 | 4 | Accept | 2.6513 | 0.10209 | 2.2082 | 2.3735 | tree | MinLeafSize: 1 | | | | | | | | | | MaxNumSplits: 90 | | | | | | | | | | NumVariablesToSample: 2 | | 37 | 4 | Accept | 2.2442 | 7.3117 | 2.2082 | 2.2083 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 1 | | | | | | | | | | NumVariablesToSample: 6 | | 38 | 4 | Accept | 2.345 | 5.3353 | 2.2082 | 2.2083 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 3 | | | | | | | | | | NumVariablesToSample: 2 | | 39 | 3 | Accept | 3.1314 | 4.9709 | 2.2082 | 2.2083 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 82 | | | | | | | | | | NumVariablesToSample: 5 | | 40 | 3 | Accept | 4.1439 | 0.076184 | 2.2082 | 2.2083 | svm | BoxConstraint: 488.75 | | | | | | | | | | KernelScale: 0.047261 | | | | | | | | | | Epsilon: 0.019147 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 41 | 5 | Accept | 2.611 | 15.327 | 2.2082 | 2.2083 | svm | BoxConstraint: 0.0057698 | | | | | | | | | | KernelScale: 199.91 | | | | | | | | | | Epsilon: 1.094 | | 42 | 5 | Accept | 4.1439 | 0.11014 | 2.2082 | 2.2083 | svm | BoxConstraint: 347.06 | | | | | | | | | | KernelScale: 0.024995 | | | | | | | | | | Epsilon: 0.012891 | | 43 | 3 | Best | 2.1839 | 5.4291 | 2.1839 | 2.2083 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.079786 | | | | | | | | | | MinLeafSize: 16 | | | | | | | | | | NumVariablesToSample: NaN | | 44 | 3 | Accept | 2.9934 | 0.080707 | 2.1839 | 2.2083 | tree | MinLeafSize: 37 | | | | | | | | | | MaxNumSplits: 171 | | | | | | | | | | NumVariablesToSample: 4 | | 45 | 3 | Accept | 4.1439 | 0.090101 | 2.1839 | 2.2083 | svm | BoxConstraint: 0.24707 | | | | | | | | | | KernelScale: 0.0040563 | | | | | | | | | | Epsilon: 0.75695 | | 46 | 6 | Accept | 2.2144 | 5.1987 | 2.1839 | 2.1982 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.078839 | | | | | | | | | | MinLeafSize: 16 | | | | | | | | | | NumVariablesToSample: NaN | | 47 | 4 | Accept | 2.2877 | 5.9143 | 2.1839 | 2.1129 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 15 | | | | | | | | | | NumVariablesToSample: 5 | | 48 | 4 | Accept | 3.0763 | 0.13281 | 2.1839 | 2.1129 | tree | MinLeafSize: 12 | | | | | | | | | | MaxNumSplits: 2 | | | | | | | | | | NumVariablesToSample: 3 | | 49 | 4 | Accept | 4.1439 | 1.3244 | 2.1839 | 2.1129 | svm | BoxConstraint: 6.6689 | | | | | | | | | | KernelScale: 0.048705 | | | | | | | | | | Epsilon: 59.545 | | 50 | 3 | Accept | 4.1439 | 30.675 | 2.1839 | 2.1984 | svm | BoxConstraint: 13.655 | | | | | | | | | | KernelScale: 4.3086 | | | | | | | | | | Epsilon: 6.9116 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 51 | 3 | Accept | 2.2728 | 5.7106 | 2.1839 | 2.1984 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 14 | | | | | | | | | | NumVariablesToSample: 5 | | 52 | 6 | Accept | 2.4156 | 4.7264 | 2.1839 | 2.1984 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 24 | | | | | | | | | | NumVariablesToSample: 3 | | 53 | 4 | Accept | 4.1439 | 0.07497 | 2.1839 | 2.1984 | svm | BoxConstraint: 424.87 | | | | | | | | | | KernelScale: 0.41352 | | | | | | | | | | Epsilon: 0.74479 | | 54 | 4 | Accept | 2.3527 | 5.0415 | 2.1839 | 2.1984 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.62721 | | | | | | | | | | MinLeafSize: 3 | | | | | | | | | | NumVariablesToSample: NaN | | 55 | 4 | Accept | 2.5975 | 0.086879 | 2.1839 | 2.1984 | tree | MinLeafSize: 2 | | | | | | | | | | MaxNumSplits: 12 | | | | | | | | | | NumVariablesToSample: 6 | | 56 | 3 | Accept | 4.1439 | 30.921 | 2.1839 | 2.1983 | svm | BoxConstraint: 0.0044643 | | | | | | | | | | KernelScale: 4.2576 | | | | | | | | | | Epsilon: 0.066941 | | 57 | 3 | Accept | 2.2488 | 6.5278 | 2.1839 | 2.1983 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 4 | | | | | | | | | | NumVariablesToSample: 6 | | 58 | 5 | Accept | 2.2375 | 6.3071 | 2.1839 | 2.1982 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 4 | | | | | | | | | | NumVariablesToSample: 6 | | 59 | 5 | Accept | 2.2145 | 5.1044 | 2.1839 | 2.1982 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.13809 | | | | | | | | | | MinLeafSize: 5 | | | | | | | | | | NumVariablesToSample: NaN | | 60 | 2 | Accept | 2.2771 | 5.7956 | 2.1839 | 2.1953 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: 4 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 61 | 2 | Accept | 2.4755 | 4.7265 | 2.1839 | 2.1953 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 5 | | | | | | | | | | NumVariablesToSample: 1 | | 62 | 2 | Accept | 2.6456 | 0.082657 | 2.1839 | 2.1953 | tree | MinLeafSize: 2 | | | | | | | | | | MaxNumSplits: 36 | | | | | | | | | | NumVariablesToSample: 4 | | 63 | 2 | Accept | 2.5294 | 5.4057 | 2.1839 | 2.1953 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 35 | | | | | | | | | | NumVariablesToSample: 5 | | 64 | 6 | Accept | 2.3409 | 5.5648 | 2.1839 | 2.0591 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 25 | | | | | | | | | | NumVariablesToSample: 6 | | 65 | 2 | Accept | 2.3209 | 7.4037 | 2.1839 | 2.0591 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.016875 | | | | | | | | | | MinLeafSize: 1 | | | | | | | | | | NumVariablesToSample: NaN | | 66 | 2 | Accept | 2.5782 | 5.5342 | 2.1839 | 2.0591 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.015531 | | | | | | | | | | MinLeafSize: 76 | | | | | | | | | | NumVariablesToSample: NaN | | 67 | 2 | Accept | 2.2537 | 7.2619 | 2.1839 | 2.0591 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 6 | | | | | | | | | | NumVariablesToSample: 7 | | 68 | 2 | Accept | 4.1426 | 4.7455 | 2.1839 | 2.0591 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 134 | | | | | | | | | | NumVariablesToSample: 2 | | 69 | 2 | Accept | 2.9366 | 0.094426 | 2.1839 | 2.0591 | tree | MinLeafSize: 8 | | | | | | | | | | MaxNumSplits: 37 | | | | | | | | | | NumVariablesToSample: 1 | | 70 | 6 | Accept | 2.2338 | 5.1862 | 2.1839 | 2.1934 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.17516 | | | | | | | | | | MinLeafSize: 9 | | | | | | | | | | NumVariablesToSample: NaN | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 71 | 3 | Accept | 4.143 | 4.4939 | 2.1839 | 2.1968 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.038144 | | | | | | | | | | MinLeafSize: 142 | | | | | | | | | | NumVariablesToSample: NaN | | 72 | 3 | Accept | 4.1439 | 0.076138 | 2.1839 | 2.1968 | svm | BoxConstraint: 131.74 | | | | | | | | | | KernelScale: 0.0031145 | | | | | | | | | | Epsilon: 0.028465 | | 73 | 3 | Accept | 4.143 | 0.074774 | 2.1839 | 2.1968 | tree | MinLeafSize: 156 | | | | | | | | | | MaxNumSplits: 1 | | | | | | | | | | NumVariablesToSample: 5 | | 74 | 3 | Accept | 2.3197 | 5.1527 | 2.1839 | 2.1968 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 9 | | | | | | | | | | NumVariablesToSample: 3 | | 75 | 6 | Accept | 2.5309 | 4.7886 | 2.1839 | 2.1969 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.97421 | | | | | | | | | | MinLeafSize: 13 | | | | | | | | | | NumVariablesToSample: NaN | | 76 | 3 | Accept | 2.2935 | 5.3774 | 2.1839 | 2.1983 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.16149 | | | | | | | | | | MinLeafSize: 30 | | | | | | | | | | NumVariablesToSample: NaN | | 77 | 3 | Accept | 2.3649 | 4.9029 | 2.1839 | 2.1983 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: 2 | | 78 | 3 | Accept | 3.3541 | 0.065977 | 2.1839 | 2.1983 | tree | MinLeafSize: 79 | | | | | | | | | | MaxNumSplits: 65 | | | | | | | | | | NumVariablesToSample: 3 | | 79 | 3 | Accept | 2.3592 | 5.0572 | 2.1839 | 2.1983 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 1 | | | | | | | | | | NumVariablesToSample: 2 | | 80 | 6 | Accept | 2.4009 | 4.5836 | 2.1839 | 2.1983 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 18 | | | | | | | | | | NumVariablesToSample: 2 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 81 | 2 | Accept | 10.894 | 31.052 | 2.1839 | 2.1983 | svm | BoxConstraint: 0.05924 | | | | | | | | | | KernelScale: 16.477 | | | | | | | | | | Epsilon: 1.204 | | 82 | 2 | Accept | 2.216 | 5.8077 | 2.1839 | 2.1983 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.038621 | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: NaN | | 83 | 2 | Accept | 2.2547 | 5.6201 | 2.1839 | 2.1983 | ensemble | Method: Bag | | | | | | | | | | LearnRate: NaN | | | | | | | | | | MinLeafSize: 4 | | | | | | | | | | NumVariablesToSample: 5 | | 84 | 2 | Accept | 4.1439 | 0.11346 | 2.1839 | 2.1983 | svm | BoxConstraint: 230.13 | | | | | | | | | | KernelScale: 15.715 | | | | | | | | | | Epsilon: 425.18 | | 85 | 2 | Accept | 4.1439 | 0.10597 | 2.1839 | 2.1983 | svm | BoxConstraint: 10.758 | | | | | | | | | | KernelScale: 0.020507 | | | | | | | | | | Epsilon: 4.9755 | | 86 | 6 | Accept | 2.219 | 6.1221 | 2.1839 | 2.1981 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.038658 | | | | | | | | | | MinLeafSize: 2 | | | | | | | | | | NumVariablesToSample: NaN | | 87 | 2 | Accept | 2.8447 | 0.17007 | 2.1839 | 2.1981 | svm | BoxConstraint: 0.013729 | | | | | | | | | | KernelScale: 535.02 | | | | | | | | | | Epsilon: 2.1063 | | 88 | 2 | Accept | 4.1439 | 0.079667 | 2.1839 | 2.1981 | svm | BoxConstraint: 0.32731 | | | | | | | | | | KernelScale: 22.615 | | | | | | | | | | Epsilon: 41.604 | | 89 | 2 | Accept | 2.2928 | 4.9488 | 2.1839 | 2.1981 | ensemble | Method: LSBoost | | | | | | | | | | LearnRate: 0.26144 | | | | | | | | | | MinLeafSize: 33 | | | | | | | | | | NumVariablesToSample: NaN | | 90 | 2 | Accept | 2.4525 | 0.12704 | 2.1839 | 2.1981 | tree | MinLeafSize: 4 | | | | | | | | | | MaxNumSplits: 92 | | | | | | | | | | NumVariablesToSample: 7 | |===================================================================================================================================================| | Iter | Active | Eval | log(1 + valLoss) | Time for training | Observed min | Estimated min | Learner | Hyperparameter: Value | | | workers | result | | & validation (sec)| log(1 + valLoss) | log(1 + valLoss) | | | |===================================================================================================================================================| | 91 | 2 | Accept | 4.1439 | 0.093014 | 2.1839 | 2.1981 | svm | BoxConstraint: 0.0021134 | | | | | | | | | | KernelScale: 0.001228 | | | | | | | | | | Epsilon: 6.4785 | __________________________________________________________ Optimization completed. Total iterations: 91 Total elapsed time: 235.4082 seconds Total time for training and validation: 426.1606 seconds Best observed learner is an ensemble model with: Method: LSBoost LearnRate: 0.079786 MinLeafSize: 16 NumVariablesToSample: NaN Observed log(1 + valLoss): 2.1839 Time for training and validation: 5.4291 seconds Best estimated learner (returned model) is an ensemble model with: Method: LSBoost LearnRate: 0.079786 MinLeafSize: 16 NumVariablesToSample: NaN Estimated log(1 + valLoss): 2.1981 Estimated time for training and validation: 5.3328 seconds Documentation for fitrauto display
Итоговая модель возвращена fitrauto соответствует лучшему предполагаемому ученику. Прежде, чем возвратить модель, функция переобучает его с помощью целых обучающих данных (carsTrain), перечисленный Learner (или модель) тип и отображенные гиперзначения параметров.
Создайте простую модель
Создайте простую модель linearMdl линейной регрессии при помощи fitlm функция.
linearMdl = fitlm(carsTrain);
Несмотря на то, что linearMdl объект не имеет тех же самых свойств и методов как autoMdl объект, можно использовать обе модели, чтобы предсказать значения отклика для новых данных при помощи predict объектная функция.
Сравните эффективность набора тестов моделей
Сравните эффективность linearMdl и autoMdl модели на тестовых данных установлены. Для каждой модели вычислите среднеквадратическую ошибку (MSE) набора тестов. Меньшие значения MSE указывают на лучшую эффективность.
ypred = predict(linearMdl,carsTest);
linearMSE = mean((carsTest.MPG-ypred).^2,'omitnan')linearMSE = 11.0981
autoMSE = loss(autoMdl,carsTest,'MPG')autoMSE = 8.8024
autoMdl модель, кажется, превосходит по характеристикам linearMdl модель.
В зависимости от размера ваших данных и количества учеников вы задаете, fitrauto может занять время, чтобы запуститься. Если у вас есть лицензия Parallel Computing Toolbox, можно ускорить расчеты путем выполнения оптимизации параллельно. Для этого задайте 'HyperparameterOptimizationOptions',struct('UseParallel',true). Можно включать другие поля в структуру, чтобы управлять другими аспектами оптимизации. Смотрите HyperparameterOptimizationOptions.
Если вы не уверены, какие модели работают лучше всего на ваш набор данных, можно альтернативно использовать приложение Regression Learner. Используя приложение, можно выполнить гиперпараметр, настраивающийся для различных моделей, и выбрать оптимизированную модель, которая выполняет лучше всего. Несмотря на то, что необходимо выбрать определенную модель, прежде чем можно будет настроить гиперпараметры модели, Regression Learner обеспечивает большую гибкость для выбора optimizable гиперпараметров и установки гиперзначений параметров. Приложение также позволяет вам обучать множество моделей линейной регрессии (см. Модели Линейной регрессии). Однако вы не можете оптимизировать параллельно, выбрать 'linear' или 'kernel' ученики, или задают веса наблюдения в приложении. Для получения дополнительной информации смотрите Гипероптимизацию параметров управления в Приложении Regression Learner.
Если вы знаете, какие модели могут удовлетворить вашим данным, можно альтернативно использовать соответствующие подходящие функции модели и задать 'OptimizeHyperparameters' аргумент пары "имя-значение", чтобы настроить гиперпараметры. Можно сравнить результаты через модели, чтобы выбрать лучшую модель регрессии. Поскольку пример этого процесса применился к моделям классификации, смотрите, что Двигающий Выбор Модели Автоматизации Использует Байесовую Оптимизацию.
fitrensemble | fitrgp | fitrkernel | fitrlinear | fitrsvm | fitrtree