diff options
| -rw-r--r-- | examples/src/main/python/ml/simple_text_classification_pipeline.py | 44 | ||||
| -rw-r--r-- | python/docs/conf.py | 4 | ||||
| -rw-r--r-- | python/pyspark/ml/classification.py | 44 | ||||
| -rw-r--r-- | python/pyspark/ml/feature.py | 72 | ||||
| -rw-r--r-- | python/pyspark/ml/param/__init__.py | 8 | ||||
| -rw-r--r-- | python/pyspark/ml/pipeline.py | 19 | ||||
| -rw-r--r-- | python/pyspark/ml/util.py | 15 |
7 files changed, 153 insertions, 53 deletions
diff --git a/examples/src/main/python/ml/simple_text_classification_pipeline.py b/examples/src/main/python/ml/simple_text_classification_pipeline.py index c7df3d7b74..b4d9355b68 100644 --- a/examples/src/main/python/ml/simple_text_classification_pipeline.py +++ b/examples/src/main/python/ml/simple_text_classification_pipeline.py @@ -36,43 +36,33 @@ if __name__ == "__main__": sqlCtx = SQLContext(sc) # Prepare training documents, which are labeled. - LabeledDocument = Row('id', 'text', 'label') - training = sqlCtx.inferSchema( - sc.parallelize([(0L, "a b c d e spark", 1.0), - (1L, "b d", 0.0), - (2L, "spark f g h", 1.0), - (3L, "hadoop mapreduce", 0.0)]) - .map(lambda x: LabeledDocument(*x))) + LabeledDocument = Row("id", "text", "label") + training = sc.parallelize([(0L, "a b c d e spark", 1.0), + (1L, "b d", 0.0), + (2L, "spark f g h", 1.0), + (3L, "hadoop mapreduce", 0.0)]) \ + .map(lambda x: LabeledDocument(*x)).toDF() # Configure an ML pipeline, which consists of tree stages: tokenizer, hashingTF, and lr. - tokenizer = Tokenizer() \ - .setInputCol("text") \ - .setOutputCol("words") - hashingTF = HashingTF() \ - .setInputCol(tokenizer.getOutputCol()) \ - .setOutputCol("features") - lr = LogisticRegression() \ - .setMaxIter(10) \ - .setRegParam(0.01) - pipeline = Pipeline() \ - .setStages([tokenizer, hashingTF, lr]) + tokenizer = Tokenizer(inputCol="text", outputCol="words") + hashingTF = HashingTF(inputCol=tokenizer.getOutputCol(), outputCol="features") + lr = LogisticRegression(maxIter=10, regParam=0.01) + pipeline = Pipeline(stages=[tokenizer, hashingTF, lr]) # Fit the pipeline to training documents. model = pipeline.fit(training) # Prepare test documents, which are unlabeled. - Document = Row('id', 'text') - test = sqlCtx.inferSchema( - sc.parallelize([(4L, "spark i j k"), - (5L, "l m n"), - (6L, "mapreduce spark"), - (7L, "apache hadoop")]) - .map(lambda x: Document(*x))) + Document = Row("id", "text") + test = sc.parallelize([(4L, "spark i j k"), + (5L, "l m n"), + (6L, "mapreduce spark"), + (7L, "apache hadoop")]) \ + .map(lambda x: Document(*x)).toDF() # Make predictions on test documents and print columns of interest. prediction = model.transform(test) - prediction.registerTempTable("prediction") - selected = sqlCtx.sql("SELECT id, text, prediction from prediction") + selected = prediction.select("id", "text", "prediction") for row in selected.collect(): print row diff --git a/python/docs/conf.py b/python/docs/conf.py index b00dce95d6..cbbf7ffb08 100644 --- a/python/docs/conf.py +++ b/python/docs/conf.py @@ -97,6 +97,10 @@ pygments_style = 'sphinx' # If true, keep warnings as "system message" paragraphs in the built documents. #keep_warnings = False +# -- Options for autodoc -------------------------------------------------- + +# Look at the first line of the docstring for function and method signatures. +autodoc_docstring_signature = True # -- Options for HTML output ---------------------------------------------- diff --git a/python/pyspark/ml/classification.py b/python/pyspark/ml/classification.py index 6bd2aa8e47..b6de7493d7 100644 --- a/python/pyspark/ml/classification.py +++ b/python/pyspark/ml/classification.py @@ -15,7 +15,7 @@ # limitations under the License. # -from pyspark.ml.util import inherit_doc +from pyspark.ml.util import inherit_doc, keyword_only from pyspark.ml.wrapper import JavaEstimator, JavaModel from pyspark.ml.param.shared import HasFeaturesCol, HasLabelCol, HasPredictionCol, HasMaxIter,\ HasRegParam @@ -32,22 +32,46 @@ class LogisticRegression(JavaEstimator, HasFeaturesCol, HasLabelCol, HasPredicti >>> from pyspark.sql import Row >>> from pyspark.mllib.linalg import Vectors - >>> dataset = sqlCtx.inferSchema(sc.parallelize([ \ - Row(label=1.0, features=Vectors.dense(1.0)), \ - Row(label=0.0, features=Vectors.sparse(1, [], []))])) - >>> lr = LogisticRegression() \ - .setMaxIter(5) \ - .setRegParam(0.01) - >>> model = lr.fit(dataset) - >>> test0 = sqlCtx.inferSchema(sc.parallelize([Row(features=Vectors.dense(-1.0))])) + >>> df = sc.parallelize([ + ... Row(label=1.0, features=Vectors.dense(1.0)), + ... Row(label=0.0, features=Vectors.sparse(1, [], []))]).toDF() + >>> lr = LogisticRegression(maxIter=5, regParam=0.01) + >>> model = lr.fit(df) + >>> test0 = sc.parallelize([Row(features=Vectors.dense(-1.0))]).toDF() >>> print model.transform(test0).head().prediction 0.0 - >>> test1 = sqlCtx.inferSchema(sc.parallelize([Row(features=Vectors.sparse(1, [0], [1.0]))])) + >>> test1 = sc.parallelize([Row(features=Vectors.sparse(1, [0], [1.0]))]).toDF() >>> print model.transform(test1).head().prediction 1.0 + >>> lr.setParams("vector") + Traceback (most recent call last): + ... + TypeError: Method setParams forces keyword arguments. """ _java_class = "org.apache.spark.ml.classification.LogisticRegression" + @keyword_only + def __init__(self, featuresCol="features", labelCol="label", predictionCol="prediction", + maxIter=100, regParam=0.1): + """ + __init__(self, featuresCol="features", labelCol="label", predictionCol="prediction", \ + maxIter=100, regParam=0.1) + """ + super(LogisticRegression, self).__init__() + kwargs = self.__init__._input_kwargs + self.setParams(**kwargs) + + @keyword_only + def setParams(self, featuresCol="features", labelCol="label", predictionCol="prediction", + maxIter=100, regParam=0.1): + """ + setParams(self, featuresCol="features", labelCol="label", predictionCol="prediction", \ + maxIter=100, regParam=0.1) + Sets params for logistic regression. + """ + kwargs = self.setParams._input_kwargs + return self._set_params(**kwargs) + def _create_model(self, java_model): return LogisticRegressionModel(java_model) diff --git a/python/pyspark/ml/feature.py b/python/pyspark/ml/feature.py index e088acd0ca..f1ddbb478d 100644 --- a/python/pyspark/ml/feature.py +++ b/python/pyspark/ml/feature.py @@ -16,7 +16,7 @@ # from pyspark.ml.param.shared import HasInputCol, HasOutputCol, HasNumFeatures -from pyspark.ml.util import inherit_doc +from pyspark.ml.util import inherit_doc, keyword_only from pyspark.ml.wrapper import JavaTransformer __all__ = ['Tokenizer', 'HashingTF'] @@ -29,18 +29,45 @@ class Tokenizer(JavaTransformer, HasInputCol, HasOutputCol): splits it by white spaces. >>> from pyspark.sql import Row - >>> dataset = sqlCtx.inferSchema(sc.parallelize([Row(text="a b c")])) - >>> tokenizer = Tokenizer() \ - .setInputCol("text") \ - .setOutputCol("words") - >>> print tokenizer.transform(dataset).head() + >>> df = sc.parallelize([Row(text="a b c")]).toDF() + >>> tokenizer = Tokenizer(inputCol="text", outputCol="words") + >>> print tokenizer.transform(df).head() Row(text=u'a b c', words=[u'a', u'b', u'c']) - >>> print tokenizer.transform(dataset, {tokenizer.outputCol: "tokens"}).head() + >>> # Change a parameter. + >>> print tokenizer.setParams(outputCol="tokens").transform(df).head() Row(text=u'a b c', tokens=[u'a', u'b', u'c']) + >>> # Temporarily modify a parameter. + >>> print tokenizer.transform(df, {tokenizer.outputCol: "words"}).head() + Row(text=u'a b c', words=[u'a', u'b', u'c']) + >>> print tokenizer.transform(df).head() + Row(text=u'a b c', tokens=[u'a', u'b', u'c']) + >>> # Must use keyword arguments to specify params. + >>> tokenizer.setParams("text") + Traceback (most recent call last): + ... + TypeError: Method setParams forces keyword arguments. """ _java_class = "org.apache.spark.ml.feature.Tokenizer" + @keyword_only + def __init__(self, inputCol="input", outputCol="output"): + """ + __init__(self, inputCol="input", outputCol="output") + """ + super(Tokenizer, self).__init__() + kwargs = self.__init__._input_kwargs + self.setParams(**kwargs) + + @keyword_only + def setParams(self, inputCol="input", outputCol="output"): + """ + setParams(self, inputCol="input", outputCol="output") + Sets params for this Tokenizer. + """ + kwargs = self.setParams._input_kwargs + return self._set_params(**kwargs) + @inherit_doc class HashingTF(JavaTransformer, HasInputCol, HasOutputCol, HasNumFeatures): @@ -49,20 +76,37 @@ class HashingTF(JavaTransformer, HasInputCol, HasOutputCol, HasNumFeatures): hashing trick. >>> from pyspark.sql import Row - >>> dataset = sqlCtx.inferSchema(sc.parallelize([Row(words=["a", "b", "c"])])) - >>> hashingTF = HashingTF() \ - .setNumFeatures(10) \ - .setInputCol("words") \ - .setOutputCol("features") - >>> print hashingTF.transform(dataset).head().features + >>> df = sc.parallelize([Row(words=["a", "b", "c"])]).toDF() + >>> hashingTF = HashingTF(numFeatures=10, inputCol="words", outputCol="features") + >>> print hashingTF.transform(df).head().features + (10,[7,8,9],[1.0,1.0,1.0]) + >>> print hashingTF.setParams(outputCol="freqs").transform(df).head().freqs (10,[7,8,9],[1.0,1.0,1.0]) >>> params = {hashingTF.numFeatures: 5, hashingTF.outputCol: "vector"} - >>> print hashingTF.transform(dataset, params).head().vector + >>> print hashingTF.transform(df, params).head().vector (5,[2,3,4],[1.0,1.0,1.0]) """ _java_class = "org.apache.spark.ml.feature.HashingTF" + @keyword_only + def __init__(self, numFeatures=1 << 18, inputCol="input", outputCol="output"): + """ + __init__(self, numFeatures=1 << 18, inputCol="input", outputCol="output") + """ + super(HashingTF, self).__init__() + kwargs = self.__init__._input_kwargs + self.setParams(**kwargs) + + @keyword_only + def setParams(self, numFeatures=1 << 18, inputCol="input", outputCol="output"): + """ + setParams(self, numFeatures=1 << 18, inputCol="input", outputCol="output") + Sets params for this HashingTF. + """ + kwargs = self.setParams._input_kwargs + return self._set_params(**kwargs) + if __name__ == "__main__": import doctest diff --git a/python/pyspark/ml/param/__init__.py b/python/pyspark/ml/param/__init__.py index 5566792cea..e3a53dd780 100644 --- a/python/pyspark/ml/param/__init__.py +++ b/python/pyspark/ml/param/__init__.py @@ -80,3 +80,11 @@ class Params(Identifiable): dummy = Params() dummy.uid = "undefined" return dummy + + def _set_params(self, **kwargs): + """ + Sets params. + """ + for param, value in kwargs.iteritems(): + self.paramMap[getattr(self, param)] = value + return self diff --git a/python/pyspark/ml/pipeline.py b/python/pyspark/ml/pipeline.py index 2d239f8c80..18d8a58f35 100644 --- a/python/pyspark/ml/pipeline.py +++ b/python/pyspark/ml/pipeline.py @@ -18,7 +18,7 @@ from abc import ABCMeta, abstractmethod from pyspark.ml.param import Param, Params -from pyspark.ml.util import inherit_doc +from pyspark.ml.util import inherit_doc, keyword_only __all__ = ['Estimator', 'Transformer', 'Pipeline', 'PipelineModel'] @@ -89,10 +89,16 @@ class Pipeline(Estimator): identity transformer. """ - def __init__(self): + @keyword_only + def __init__(self, stages=[]): + """ + __init__(self, stages=[]) + """ super(Pipeline, self).__init__() #: Param for pipeline stages. self.stages = Param(self, "stages", "pipeline stages") + kwargs = self.__init__._input_kwargs + self.setParams(**kwargs) def setStages(self, value): """ @@ -110,6 +116,15 @@ class Pipeline(Estimator): if self.stages in self.paramMap: return self.paramMap[self.stages] + @keyword_only + def setParams(self, stages=[]): + """ + setParams(self, stages=[]) + Sets params for Pipeline. + """ + kwargs = self.setParams._input_kwargs + return self._set_params(**kwargs) + def fit(self, dataset, params={}): paramMap = self._merge_params(params) stages = paramMap[self.stages] diff --git a/python/pyspark/ml/util.py b/python/pyspark/ml/util.py index b1caa84b63..81d3f0882b 100644 --- a/python/pyspark/ml/util.py +++ b/python/pyspark/ml/util.py @@ -15,6 +15,7 @@ # limitations under the License. # +from functools import wraps import uuid @@ -32,6 +33,20 @@ def inherit_doc(cls): return cls +def keyword_only(func): + """ + A decorator that forces keyword arguments in the wrapped method + and saves actual input keyword arguments in `_input_kwargs`. + """ + @wraps(func) + def wrapper(*args, **kwargs): + if len(args) > 1: + raise TypeError("Method %s forces keyword arguments." % func.__name__) + wrapper._input_kwargs = kwargs + return func(*args, **kwargs) + return wrapper + + class Identifiable(object): """ Object with a unique ID. |