diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/pyspark/mllib/classification.py | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/python/pyspark/mllib/classification.py b/python/pyspark/mllib/classification.py index ee0729b1eb..f14d0ed11c 100644 --- a/python/pyspark/mllib/classification.py +++ b/python/pyspark/mllib/classification.py @@ -26,8 +26,8 @@ from pyspark.mllib.linalg import SparseVector, _convert_to_vector from pyspark.mllib.regression import LabeledPoint, LinearModel, _regression_train_wrapper -__all__ = ['LogisticRegressionModel', 'LogisticRegressionWithSGD', 'SVMModel', - 'SVMWithSGD', 'NaiveBayesModel', 'NaiveBayes'] +__all__ = ['LogisticRegressionModel', 'LogisticRegressionWithSGD', 'LogisticRegressionWithLBFGS', + 'SVMModel', 'SVMWithSGD', 'NaiveBayesModel', 'NaiveBayes'] class LinearBinaryClassificationModel(LinearModel): @@ -151,7 +151,7 @@ class LogisticRegressionWithSGD(object): (default: "l2") - @param intercept: Boolean parameter which indicates the use + :param intercept: Boolean parameter which indicates the use or not of the augmented representation for training data (i.e. whether bias features are activated or not). @@ -164,6 +164,55 @@ class LogisticRegressionWithSGD(object): return _regression_train_wrapper(train, LogisticRegressionModel, data, initialWeights) +class LogisticRegressionWithLBFGS(object): + + @classmethod + def train(cls, data, iterations=100, initialWeights=None, regParam=0.01, regType="l2", + intercept=False, corrections=10, tolerance=1e-4): + """ + Train a logistic regression model on the given data. + + :param data: The training data, an RDD of LabeledPoint. + :param iterations: The number of iterations (default: 100). + :param initialWeights: The initial weights (default: None). + :param regParam: The regularizer parameter (default: 0.01). + :param regType: The type of regularizer used for training + our model. + + :Allowed values: + - "l1" for using L1 regularization + - "l2" for using L2 regularization + - None for no regularization + + (default: "l2") + + :param intercept: Boolean parameter which indicates the use + or not of the augmented representation for + training data (i.e. whether bias features + are activated or not). + :param corrections: The number of corrections used in the LBFGS + update (default: 10). + :param tolerance: The convergence tolerance of iterations for + L-BFGS (default: 1e-4). + + >>> data = [ + ... LabeledPoint(0.0, [0.0, 1.0]), + ... LabeledPoint(1.0, [1.0, 0.0]), + ... ] + >>> lrm = LogisticRegressionWithLBFGS.train(sc.parallelize(data)) + >>> lrm.predict([1.0, 0.0]) + 1 + >>> lrm.predict([0.0, 1.0]) + 0 + """ + def train(rdd, i): + return callMLlibFunc("trainLogisticRegressionModelWithLBFGS", rdd, int(iterations), i, + float(regParam), str(regType), bool(intercept), int(corrections), + float(tolerance)) + + return _regression_train_wrapper(train, LogisticRegressionModel, data, initialWeights) + + class SVMModel(LinearBinaryClassificationModel): """A support vector machine. @@ -241,7 +290,7 @@ class SVMWithSGD(object): (default: "l2") - @param intercept: Boolean parameter which indicates the use + :param intercept: Boolean parameter which indicates the use or not of the augmented representation for training data (i.e. whether bias features are activated or not). |