def test_model_polynomial_expansion(self):
data = self.spark.createDataFrame(
[(Vectors.sparse(5, [(1, 1.0), (3, 7.0)]), ),
(Vectors.dense([2.0, 0.0, 3.0, 4.0, 5.0]), ),
(Vectors.dense([4.0, 0.0, 0.0, 6.0, 7.0]), )], ["features"])
pca = PCA(k=2, inputCol="features", outputCol="pca_features")
model = pca.fit(data)
# the input name should match that of what StringIndexer.inputCol
feature_count = data.first()[0].size
N = data.count()
model_onnx = convert_sparkml(
model, 'Sparkml PCA',
[('features', FloatTensorType([N, feature_count]))])
self.assertTrue(model_onnx is not None)
# run the model
predicted = model.transform(data)
expected = predicted.toPandas().pca_features.apply(
lambda x: pandas.Series(x.toArray())).values.astype(numpy.float32)
data_np = data.toPandas().features.apply(
lambda x: pandas.Series(x.toArray())).values.astype(numpy.float32)
paths = save_data_models(data_np,
expected,
model,
model_onnx,
basename="SparkmlPCA")
onnx_model_path = paths[3]
output, output_shapes = run_onnx_model(['pca_features'], data_np,
onnx_model_path)
compare_results(expected, output, decimal=5)
def pca_model(data, k=7, inputcol='scale_features', outputcol='pca_features'):
# new_df
pca = PCA(k=k, inputCol=inputcol, outputCol=outputcol)
model = pca.fit(data)
variance = model.explainedVariance
pca_data = model.transform(data)
return variance, pca_data
def PCA_setting(spark, rdd, n):
df = spark.createDataFrame(rdd,schema=['features'])
pca = PCA(k=n,inputCol='features',outputCol='pca_features')
model = pca.fit(df)
return model.transform(df).select('pca_features').collect()
def _perform_pca(self, dataset: DataFrame, k: int):
# Since we want to plot the clusters, it is important
# downsize the dimensions to at most 3 dimensions.
# We can use PCA with 3 principal components for this.
pca = PCA(k=k, inputCol="features", outputCol="pcaFeatures")
pca_model = pca.fit(dataset)
rows = pca_model \
.transform(dataset) \
.select("clusterNum", "pcaFeatures") \
.collect()
# Now we'll plot the clusters as a 3D scatter plot with
# each point's color corresponding to its cluster.
# Cast cluterNum to string so it is treated as categorical
# data for plotting purposes.
axes = zip(*[row["pcaFeatures"] for row in rows])
colors = pd.Categorical([row["clusterNum"] for row in rows])
if k == 2:
x, y = axes
fig = plt.figure(figsize=(15, 15))
sns.scatterplot(x=x, y=y, hue=colors)
if k == 3:
x, y, z = axes
plot_df = pd.DataFrame({"PCA 1": x, "PCA 2": y, "PCA 3": z, "cluster": colors})
g = sns.PairGrid(plot_df, hue="cluster", palette="coolwarm")
g = g.map(sns.scatterplot, linewidths=0.75, edgecolor="w", s=40)
g = g.add_legend()
g.fig.set_size_inches(15, 15)
# Specify number of principal components and clusters in model
image_path = os.path.join("analysis", "results",
"charts", f"pca-{k}-{self.model_name}.png")
plt.savefig(image_path)
def _get_pca_model(feat_train, k):
from pyspark.ml.feature import PCA
pca = PCA(k=k, inputCol="features", outputCol="pca_features")
pca_model = pca.fit(feat_train)
# Explained Variance
logr.log_event('Training Accuracy', f"{sum(pca_model.explainedVariance)}")
return pca_model
def get_preprocessed_data(input_train, input_test):
# Train Data
train = spark.read.csv(input_train, header=False, inferSchema="true")
train_labels = get_vector(train.select('_c0'), 'train_label')
train_features = get_vector(train.drop('_c0'), 'feature')
# Test Data
test = spark.read.csv(input_test, header=False, inferSchema="true")
test_labels = get_vector(test.select('_c0'), 'test_label')
test_features = get_vector(test.drop('_c0'), 'feature')
# Compute PCA
pca = PCA(k=50, inputCol="feature", outputCol="pca_feature")
pca_model = pca.fit(train_features)
# Apply PCA to train / test features
train_features_pca = pca_model.transform(train_features).select(
"pca_feature")
test_features_pca = pca_model.transform(test_features).select(
"pca_feature")
# Rename pca feature column values
train_features_pca = train_features_pca.withColumnRenamed(
"pca_feature", "train_feature")
test_features_pca = test_features_pca.withColumnRenamed(
"pca_feature", "test_feature")
# Create combined train / test data
train_data = combine_features_labels(train_features_pca, train_labels,
'train')
test_data = combine_features_labels(test_features_pca, test_labels, 'test')
return train_data, test_data
def pca(self, df, k=1):
cov = RowMatrix(
df.rdd.map(lambda x: list(x))).computeCovariance().toArray()
col = cov.shape[1]
eigVals, eigVecs = np.linalg.eigh(cov)
inds = np.argsort(eigVals)
eigVecs = eigVecs.T[inds[-1:-(col + 1):-1]]
eigVals = eigVals[inds[-1:-(col + 1):-1]]
components = RowMatrix(
df.rdd.map(lambda x: list(x))).computePrincipalComponents(k)
train_data = df.rdd.map(
lambda x: Row(features=Vectors.dense(x))).toDF()
pca = PCA(k=k, inputCol="features", outputCol="pcaFeatures")
model = pca.fit(train_data)
score = model.transform(train_data)
res = {
"components":
components.toArray(),
"score":
np.array(
score.select("pcaFeatures").rdd.map(
lambda x: list(x[0])).collect()),
"eigVectors":
eigVecs,
"eigValues":
eigVals
}
return res
def __build_pca(self, df, metadata_path):
pca = PCA(k=self.k,
inputCol='scaled_features',
outputCol='pca_features')
if self.__metadata:
pca.fit(df).write().overwrite().save(metadata_path)
return PCAModel.load(metadata_path).transform(df)
return pca.fit(df).transform(df)
def pca(inputdir,df,alg,k):
from pyspark.ml.feature import PCA
pca = PCA(k=int(k),inputCol="features", outputCol="pca_features")
model = pca.fit(df)
outData = model.transform(df)
pcaFeatures = outData.select("labels","pca_features")
output_data = writeOut(inputdir,pcaFeatures,alg,k)
return output_data
def pca_generic(data, dimens, input_col, output_col="pcaFeatures"):
print('PCA Result with dimentions = ' + str(dimens) +
' with output column pcaFeatures')
pca_generic = PCA(k=dimens, inputCol=input_col, outputCol=output_col)
pca_model_generic = pca_generic.fit(data)
result_pca_generic = pca_model_generic.transform(data)
result_pca_generic.show()
print('\n')
return result_pca_generic, pca_model_generic
def runPCA(vector_features, k=3):
from pyspark.ml.feature import PCA
#convert df to feature_vec
feature_vec = vector_features.select('features')
pca = PCA(k, inputCol="features", outputCol="pcaFeatures")
model = pca.fit(feature_vec)
result = model.transform(feature_vec).select("pcaFeatures")
return result
def cluster(self, df, session, repartition_num=8):
n = df.count()
# index rows
df_index = df.select((row_number().over(
Window.partitionBy(lit(0)).orderBy(self.featureCol)) -
1).alias('id'), "*")
df_features = df_index.select('id', self.featureCol)
# prep for joining
df_features = df_features.repartitionByRange(repartition_num, 'id')
left_df = df_features.select(
df_features['id'].alias('left_id'),
df_features[self.featureCol].alias('left_features'))
right_df = df_features.select(
df_features['id'].alias('right_id'),
df_features[self.featureCol].alias('right_features'))
# join on self where left_id does not equal right_id
joined_df = left_df.join(right_df,
left_df['left_id'] != right_df['right_id'])
# comupte cosine similarity between vectors
joined_df = joined_df.select(
'left_id', 'right_id',
cosine_similarity_udf(
array(joined_df['left_features'],
joined_df['right_features'])).alias('norm'))
ranked = joined_df.select(
'left_id', 'right_id',
rank().over(
Window.partitionBy('left_id').orderBy('norm')).alias('rank'))
knn = ranked.where(ranked['rank'] <= 5)
knn_grouped = knn.groupBy('left_id').agg(
f.collect_list('right_id').alias('nn'))
# generate laplacian
laplacian = knn_grouped.select(
knn_grouped['left_id'].alias('id'),
toVector_udf(
laplacian_vector_udf(knn_grouped['left_id'], knn_grouped['nn'],
lit(n),
lit(self.k_nearest))).alias('lap_vector'))
pca = PCA(k=self.num_eigenvectors,
inputCol='lap_vector',
outputCol='features').fit(laplacian)
eigenvectors = pca.transform(laplacian).select('id', 'features')
model = KMeans(featuresCol='features',
predictionCol=self.predictionCol,
k=self.k).fit(eigenvectors)
predictions = model.transform(eigenvectors).join(df_index, on='id')
return predictions
def clustering(input_df, input_col_name, n):
""" KMeans and PCA """
input_df = input_df.select('state','categories','stars',input_col_name)
norm = Normalizer(inputCol=input_col_name, outputCol="features", p=1.0)
df = norm.transform(input_df)
kmeans = KMeans(k=n, seed=2)
KMmodel = kmeans.fit(df)
predicted = KMmodel.transform(df).cache()
pca = PCA(k=2, inputCol='features', outputCol="pc")
df = pca.fit(dfsample).transform(dfsample).cache()
return df
async def plot_cluster(self, df, x='_3', y='_4'):
pca = PCAml(k=2, inputCol="features", outputCol="pca")
model3 = pca.fit(df)
transformed2 = model3.transform(df)
def extract(row):
return (row.customer, ) + (row.prediction, ) + tuple(
row.pca.toArray().tolist())
pcadf = transformed2.rdd.map(extract).toDF(["customer", "prediction"])
pcadf.show(10, False)
pandad = pcadf.toPandas()
pandad.plot.scatter(x=x, y=y, c='prediction', colormap='viridis')
plt.show()
def train(df, hiperparameter):
'''
Fits a model to the input dataset with optional parameters.
Input/Parameters:
datafame/dataset – input dataset, which is an instance of pyspark.sql.DataFrame
config (configurasi hiperparameter)
Output/Returns:
fitted model(s)
'''
pca = PCA(k=hiperparameter['k'],
inputCol=hiperparameter['inputCol'],
outputCol=hiperparameter['outputCol'])
model = pca.fit(df)
return model
def test_nested_pipeline_persistence(self):
"""
Pipeline[HashingTF, Pipeline[PCA]]
"""
temp_path = tempfile.mkdtemp()
try:
df = self.spark.createDataFrame([(["a", "b", "c"], ),
(["c", "d", "e"], )], ["words"])
tf = HashingTF(numFeatures=10,
inputCol="words",
outputCol="features")
pca = PCA(k=2, inputCol="features", outputCol="pca_features")
p0 = Pipeline(stages=[pca])
pl = Pipeline(stages=[tf, p0])
model = pl.fit(df)
pipeline_path = temp_path + "/pipeline"
pl.save(pipeline_path)
loaded_pipeline = Pipeline.load(pipeline_path)
self._compare_pipelines(pl, loaded_pipeline)
model_path = temp_path + "/pipeline-model"
model.save(model_path)
loaded_model = PipelineModel.load(model_path)
self._compare_pipelines(model, loaded_model)
finally:
try:
rmtree(temp_path)
except OSError:
pass
def execute(self):
from pyspark.ml.feature import VectorAssembler
from pyspark.ml.feature import PCA
from pyspark.ml import Pipeline
from pyspark.sql.functions import udf, col
from pyspark.sql.types import ArrayType, DoubleType
assert int(self.k) <= len(self.originalDF.columns), "维度需不大于样本数"
# 需要将features合并到一个vector，稍后再分解
vectorAssembler = VectorAssembler(inputCols=self.columns, outputCol="features")
pca = PCA(k=5, inputCol="features", outputCol='pca_features')
pipeline = Pipeline(stages=[vectorAssembler, pca])
self.pipelineModel = pipeline.fit(self.originalDF)
self.transformDF = self.pipelineModel.transform(self.originalDF)
# 定义UDF，将vector转换成double array
def to_array(col):
def to_array_(v):
return v.toArray().tolist()
return udf(to_array_, ArrayType(DoubleType()))(col)
self.transformDF = self.transformDF.withColumn("pca_features", to_array(col("pca_features")))
for i in range(5):
self.transformDF = self.transformDF.withColumn("pca_" + str(i), col("pca_features")[i])
self.transformDF = self.transformDF.drop("pca_features", "features")
def pca_encoder(k, features_name, output_name):
pca_model = PCA()\
.setK(k)\
.setInputCol(features_name)\
.setOutputCol(output_name)
return [pca_model]
def _compute_cluster_analysis(spark_df, clusters=5):
numeric_columns = list(map(lambda col_dtype: col_dtype[0], spark_df.dtypes))
if (len(numeric_columns) == 0):
raise ValueError("The provided spark dataframe does not contain any numeric columns. "
"Cannot compute cluster analysis with k-means on categorical columns. "
"The numeric datatypes are: {}" \
" and the number of numeric datatypes in the dataframe is: {} ({})".format(
constants.SPARK_CONFIG.SPARK_NUMERIC_TYPES, len(spark_df.dtypes), spark_df.dtypes))
if (len(numeric_columns) == 1):
raise ValueError("The provided spark dataframe does contains only one numeric column. "
"Cluster analysis will filter out numeric columns and then "
"use pca to reduce dataset dimension to 2 dimensions and "
"then apply KMeans, this is not possible when the input data have only one numeric column."
"The numeric datatypes are: {}"
" and the number of numeric datatypes in the dataframe is: {} ({})".format(
constants.SPARK_CONFIG.SPARK_NUMERIC_TYPES, len(spark_df.dtypes), spark_df.dtypes))
vecAssembler = VectorAssembler(inputCols=numeric_columns,
outputCol=constants.FEATURE_STORE.CLUSTERING_ANALYSIS_INPUT_COLUMN)
spark_df_1 = vecAssembler.transform(spark_df)
kmeans = KMeans(k=clusters, seed=1, maxIter=20,
featuresCol=constants.FEATURE_STORE.CLUSTERING_ANALYSIS_INPUT_COLUMN,
predictionCol=constants.FEATURE_STORE.CLUSTERING_ANALYSIS_OUTPUT_COLUMN)
model = kmeans.fit(spark_df_1.select(constants.FEATURE_STORE.CLUSTERING_ANALYSIS_INPUT_COLUMN))
spark_df_2 = model.transform(spark_df_1)
spark_df_3 = spark_df_2.select([constants.FEATURE_STORE.CLUSTERING_ANALYSIS_INPUT_COLUMN,
constants.FEATURE_STORE.CLUSTERING_ANALYSIS_OUTPUT_COLUMN])
count = spark_df_3.count()
if count < constants.FEATURE_STORE.CLUSTERING_ANALYSIS_SAMPLE_SIZE:
spark_df_4 = spark_df_3
else:
spark_df_4 = spark_df_3.sample(True,
float(constants.FEATURE_STORE.CLUSTERING_ANALYSIS_SAMPLE_SIZE) / float(count))
pca = PCA(k=2,
inputCol=constants.FEATURE_STORE.CLUSTERING_ANALYSIS_INPUT_COLUMN,
outputCol=constants.FEATURE_STORE.CLUSTERING_ANALYSIS_PCA_COLUMN)
model = pca.fit(spark_df_4)
spark_df_5 = model.transform(spark_df_4).select([constants.FEATURE_STORE.CLUSTERING_ANALYSIS_PCA_COLUMN,
constants.FEATURE_STORE.CLUSTERING_ANALYSIS_OUTPUT_COLUMN])
spark_df_6 = spark_df_5.withColumnRenamed(
constants.FEATURE_STORE.CLUSTERING_ANALYSIS_PCA_COLUMN,
constants.FEATURE_STORE.CLUSTERING_ANALYSIS_FEATURES_COLUMN)
spark_df_7 = spark_df_6.withColumnRenamed(constants.FEATURE_STORE.CLUSTERING_ANALYSIS_OUTPUT_COLUMN, "clusters")
return json.loads(spark_df_7.toPandas().to_json())
def view(self, data, pred):
"""Use PCA to reduce dimension and visualize the data"""
pca = PCA(k=3, inputCol="scaled", outputCol="pca-3")
model = pca.fit(data)
transformed = model.transform(data)
view = (transformed.select("prediction", "pca-3").withColumn(
"axis", self.to_array(
column("pca-3"))).select(["prediction"] +
[column("axis")[i]
for i in range(3)]))
dataframe = view.toPandas()
fig = pyplot.figure(figsize=(20, 20))
ax = fig.add_subplot(111, projection="3d")
ax.scatter(
dataframe.iloc[:, 1],
dataframe.iloc[:, 2],
dataframe.iloc[:, 3],
c=dataframe.iloc[:, 0] + 2,
)
pyplot.show()
def feature_engi(df):
'''
The function Combine the gender, usage time, and paid usage columns into a vector,
and Scales the Vectors
'''
#Combine the gender, usage time, and paid usage columns into a vector
assembler = VectorAssembler(inputCols=["sex", "time_gap", "chgrd"],
outputCol="NumFeatures")
df = assembler.transform(df)
pca = PCA(k=2, inputCol="NumFeatures",
outputCol="pca") # k is the number of dims
model = pca.fit(df)
df = model.transform(df)
#Scale the Vectors
scaler = StandardScaler(inputCol="pca",
outputCol="features",
withMean=True,
withStd=False)
scalerModel = scaler.fit(df)
df = scalerModel.transform(df)
return df
pass
def rebuild_pipeline(s3_name, df):
first_stages, df = prepare_data(df)
objetivo, model_name, hyperparams = reverse_parse_filename(s3_name)
data_types = get_data_types(df)
numericals_double = [var for var in data_types["DoubleType"]]
numericals_int = [var for var in data_types["IntegerType"]]
features = numericals_double + numericals_int
# + [var + "_one_hot" for var in strings_used]
stage_assembler = VectorAssembler(inputCols=features,
outputCol="assem_features")
num_pca = int(hyperparams["pca"])
if num_pca > 0:
stage_pca = PCA(k=num_pca,
inputCol="assem_features",
outputCol="features")
else:
stage_pca = PCA(k=8, inputCol="assem_features", outputCol="features")
return df, stage_pca, stage_assembler
def pca_opreator(k):
'''
do PCA on dataset
inputformat:(DataFrame)
Row(<feature>, <label>)
outputformat:(DataFrame)
Row(<feature>, <label>, <PCA_feature>)
'''
# df = SQLContext.createDateFrame(RDD)
model = PCA(k=k, inputCol='feature', outputCol='PCA_feature')
# pca_df = model.transform(df)
# model.write().overwrite().save("fault_diagnosis/models/pca.model")
# pca_df.select('pca_feature').show(truncate=False)
return model
def __init__(self, Movie):
# Get all movies watched by all users, distinct of (ratings union of tags)
self.usersMovies = Movie.usersMovies
# Join with movies to get genres
self.usersGenres = self.usersMovies.join(Movie.movies, 'movieId').\
select('userId', explode(split('genres', "\|").alias('genres')).alias('genre'))
# All the 20 genres
self.genres_str = 'Crime|Romance|Thriller|Adventure|Drama|War|Documentary|Fantasy|Mystery|Musical|Animation|Film-Noir|(no genres listed)|IMAX|Horror|Western|Comedy|Children|Action|Sci-Fi'
# Get all users
self.users = Movie.usersMovies.select('userId').distinct()
# Form a template with users X genres
self.usersGenresTemplate = self.users.withColumn('genres', lit(self.genres_str)).\
select('userId', explode(split('genres', "\|").alias('genres')).alias('genre'))
# Fill in the template with the actual values, and zero where null
self.usersGenresFilled = self.usersGenres.groupBy('userId', 'genre').agg(count('genre').alias('count')).\
join(self.usersGenresTemplate, ['userId', 'genre'], 'right').fillna(0)
# Sort by Genre and form genre array and counts
self.usersFeatures = self.usersGenresFilled.groupBy('userId', 'genre').agg(sum('count').alias('count_')).\
sort('genre', ascending=True).groupBy('userId').\
agg(collect_list('genre').alias('genres'), collect_list('count_').alias('count')).cache()
#
userGenres = self.usersFeatures.drop('genres')
self.datapoints = userGenres.select(
'userId',
normalizeUdf(col('count')).alias('features'))
# Trains a k-means model.
kmeans = KMeans(maxIter=10).setK(3).setSeed(1)
self.model = kmeans.fit(self.datapoints.select('features'))
# kmeans.save(data_path + "/kmeans")
# PCA reduction for visual
pca = PCA(k=2, inputCol="features", outputCol="pcaFeatures")
self.pcaModel = pca.fit(self.datapoints.select('features'))
def PCA_transform(sc, samples_df, feature_count, threshold, k):
# check input
if threshold and ((threshold > 1) or (threshold < 0)):
print "ERROR: PCA_transform: Input threshold should be within 0 to 1"
return (None, None, None)
if k and k < 0:
print "ERROR: transform: Input k should be greater than 0"
return (None, None, None)
#print "df.shape=",df.shape
#print "in ml_sklearn_PCA_transform()"
df_reduced = None
pca = None
if not threshold is None: # by threshold ===============
if feature_count > 200:
fk = 200
print "INFO: force k to " + str(fk) + " for PCA."
else:
fk = feature_count
pca = PCA(k=fk, inputCol="features", outputCol="pcaFeatures")
pca_model = pca.fit(samples_df)
sum_ratio = 0
# get ratio array and find n_components
var_arr = pca_model.explainedVariance
print "RESULT: PCA ratio_vec=", var_arr
n_components = ml_util.ml_get_n_components(var_arr, threshold)
'''
for n_components,val in enumerate(var_arr):
sum_ratio=sum_ratio+val
if sum_ratio >= threshold:
break
'''
k = n_components
#print sum_ratio, n_components
df_pcaed_all = pca_model.transform(samples_df).select(
"hash", "label", "pcaFeatures")
# get k column only
sqlCtx = SQLContext(sc)
df_pcaed = sqlCtx.createDataFrame(
df_pcaed_all.rdd.map(lambda p: (p["hash"], p["label"], p[
"pcaFeatures"].toArray()[:k])).map(lambda p: Row(
hash=p[0], label=p[1], pcaFeatures=DenseVector(p[2]))))
print "INFO: PCA_transform: n_components =", n_components, ", threshold=", threshold
elif k > 0: # by n_components ===============
pca = PCA(k=k, inputCol="features", outputCol="pcaFeatures")
pca_model = pca.fit(samples_df)
df_pcaed = pca_model.transform(samples_df).select(
"hash", "label", "pcaFeatures")
print "INFO: PCA_transform: n_components =", k
return (df_pcaed, k, pca_model)
def count_df(filename):
'''
Write a Python script using DataFrames that prints the number of trees
(non-header lines) in the data file passed as first argument.
Test file: tests/test_count_df.py
Note: The return value should be an integer
'''
spark = init_spark()
init_df = spark.read.option("inferSchema", "true").option("header", "true").csv(filename,header=True)
cols = init_df.columns
cols = cols[:-1]
vecAssembler = VectorAssembler(inputCols=cols, outputCol="features")
standardizer = StandardScaler(withMean=True, withStd=True,inputCol='features',outputCol='std_features')
indexer = StringIndexer(inputCol="class", outputCol="label_idx")
pca = PCA(k=5, inputCol="std_features", outputCol="pca")
lr_pca = LogisticRegression(featuresCol='pca', labelCol='label_idx')
lr_withoutpp = LogisticRegression(featuresCol='pca', labelCol='label_idx')
pipeline = Pipeline(stages=[vecAssembler, standardizer, indexer, pca, lr_withoutpp])
train, test = init_df.randomSplit([0.7, 0.3])
model = pipeline.fit(train)
import warnings
with warnings.catch_warnings():
warnings.simplefilter('ignore')
prediction = model.transform(test)
score = prediction.select(['prediction', 'label_idx'])
metrics = BinaryClassificationMetrics(score.rdd)
print(metrics)
score.show(n=score.count())
acc = score.rdd.map(lambda x: x[1] == x[0]).sum() / score.count()
print(acc)
def get_models_params_dic():
stage_pca = PCA(k=15, inputCol="scaled_features", outputCol="features")
lr = LogisticRegression()
lr_paramGrid = ParamGridBuilder() \
.addGrid(stage_pca.k, [1]) \
.addGrid(lr.maxIter, [1]) \
.build()
dt = DecisionTreeClassifier()
dt_paramGrid = ParamGridBuilder() \
.addGrid(stage_pca.k, [1]) \
.addGrid(dt.maxDepth, [2]) \
.build()
paramGrid_dic = {"LR": lr_paramGrid, "DT": dt_paramGrid}
model_dic = {"LR": lr, "DT": dt}
return model_dic, paramGrid_dic
def pipeline_assembler_pca(Spark, trainDat, testDat, k=50):
# read data
train_df = Spark.read.csv(trainDat, header=False, inferSchema="true")
test_df = Spark.read.csv(testDat, header=False, inferSchema="true")
# assembler them
assembler = VectorAssembler(
inputCols=train_df.columns[1:], outputCol="features")
# PCA init
pca = PCA(k=k, inputCol="features", outputCol="features_pcas")
# pipeline set
pipeline = Pipeline(stages=[assembler, pca])
# fit model
model = pipeline.fit(train_df)
# transform train data
train_pca_result = model.transform(train_df).select(
col(train_df.columns[0]).alias("label"), "features_pcas")
# transform test data
test_pca_result = model.transform(test_df).select(
col(test_df.columns[0]).alias("label"), "features_pcas")
return train_pca_result, test_pca_result
#raw_df.saveAsTextFile("subtrain_preprocess.txt")
weights = [.8, .1, .1]
seed = 42
raw_train_df, raw_validation_df, raw_test_df = raw_df.randomSplit(
weights, seed)
def parse_point(point):
feats = point.split(",")[1:]
return [(idx, value) for (idx, value) in enumerate(feats)]
parsedTrainFeat = raw_train_df.map(parse_point)
parsedValidFeat = raw_validation_df.map(parse_point)
####### PCA data ###############
pca = PCA(k=4, inputCol="features", outputCol="pcafeatures")
ctrOHEDict_train = create_one_hot_dict(parsedTrainFeat)
ctrOHEDict_valid = create_one_hot_dict(parsedValidFeat)
numCtrOHEFeats = len(ctrOHEDict_train.keys())
def pca_data(data, OHEDict):
df = sqlContext.createDataFrame(data, ["features"])
model_pca = pca.fit(df)
data_pca = model_pca.transform(df).map(lambda x: parse_point(x))
numOHEFeats = len(data_pca.keys())
print(" THIS SHIT :", data_pca)
return one_hot_encoding(data_pca, OHEDict, numOHEFeats)
#input
rdd = sc.textFile("/user/demo/train.csv").filter(lambda x: x != titile).\
map(lambda x:x.split(","))
D = 2 ** 24
def helper1(r):
features=[]
try:
fe = r[1:-1]
for i in range(len(fe)):
features.append(float(abs(hash("VAR_"+'{0:04}'.format(i)+fe[i])))%D)
target = float(r[-1])
ID=float(r[0])
return target, Vectors.dense(features)
except:
return (0.0,[0.0]*1932)
new_rdd = rdd.filter(lambda i : len(i)==1934)
rdd_after_trans = new_rdd.map(helper1)
rdd_after_trans.cache()
df = sqlContext.createDataFrame(rdd_after_trans,["label", "features"])
pca = PCA(k=1000, inputCol="features", outputCol="pca_features")
model_pca = pca.fit(df)
rdd_pca = model_pca.transform(df).select(["label","pca_features"])
rdd_pca1 = rdd_pca.withColumnRenamed('pca_features', 'features')
(trainingData, testData) = rdd_pca1.randomSplit([0.7, 0.3])
lr = LogisticRegression(maxIter=100, regParam=0.01)
model = lr.fit(trainingData)
result = model.transform(testData).rdd.map(lambda r: str(r.label)+','+str(r.probability[0]))
result.saveAsTextFile("/user/demo/lr_pca_1000_001")
withMean=True,
withStd=True)
# Scale the numeric columns of the data.
scalerModel = scaler.fit(transformed)
scaled_genres_features = scalerModel.transform(transformed).distinct()
# Select the desired columns from the data.
scaled_genres_features = (scaled_genres_features.select(
F.col('Track_ID'),
F.col('scaledFeatures').alias('features'), F.col('Genre')))
scaled_genres_features.show()
# Define the principle component analysis object. We only want the top 10 features.
pca = PCA(k=10, inputCol="features", outputCol="pca_features")
# Fit and transform the data into PCA features.
pca_model = pca.fit(scaled_genres_features)
scaled_genres_features = pca_model.transform(scaled_genres_features)
##########################
# Convert the genre column into a column representing if the song is "Electronic" or some other genre
# as a binary label.
scaled_genres_features = (scaled_genres_features.withColumn(
'label',
F.when((F.col('Genre') == 'Electronic'), 1).otherwise(0)))
scaled_genres_features.show(20)
cols = spark_df.drop('labclass').columns
assembler = VectorAssembler(inputCols=cols, outputCol='features')
labelIndexer = StringIndexer(inputCol="labclass",
outputCol="indexedLabel").fit(spark_df)
## Standardize the columns
scaler = StandardScaler(inputCol="features",
outputCol="scaledFeatures",
withStd=False,
withMean=True)
## Principal component analysis
pca = PCA(k=3, inputCol='scaledFeatures', outputCol='pcaFeature')
(trainingData, testData) = spark_df.randomSplit([0.8, 0.2])
## Training a RandomForest model
rf = RandomForestClassifier(labelCol="indexedLabel",
featuresCol="pcaFeature",
numTrees=10)
## Retrieve orginal labels from indexed labels
labelConverter = IndexToString(inputCol="prediction",
outputCol="predictedLabel",
labels=labelIndexer.labels)
os.system("export _JAVA_OPTIONS='-Xms1g -Xmx40g'")
conf = (SparkConf().set("spark.driver.maxResultSize", "5g"))
sc = SparkContext(conf=conf)
sqlContext = SQLContext(sc)
lines = sc.textFile(inputpath).map(lambda x:x.split(" "))
lines = lines.map(lambda x:(x[0],[float(y) for y in x[1:]]))
df = lines.map(lambda x: Row(labels=x[0],features=Vectors.dense(x[1]))).toDF()
####Run####
pca = PCA(k=int(k),inputCol="features", outputCol="pca_features")
model = pca.fit(df)
outData = model.transform(df)
pcaFeatures = outData.select("labels","pca_features")
####Write Out####
output_dir = inputdir + "/pca" + str(k) + "_Features"
output_data = inputdir + "/pca" + str(k) + "_Data"
n_data = 0
n_features = 0
if os.path.isdir(output_dir):
os.system("rm -r " + output_dir)
df.rdd.repartition(1).saveAsTextFile(output_dir)
outputfile = open(output_data, 'w')
("Logistic regression models are neat".split(" "), )
], ["text"])
# Learn a mapping from words to Vectors.
word2Vec = Word2Vec(vectorSize=3, minCount=0, inputCol="text",
outputCol="result")
model = word2Vec.fit(documentDF)
result = model.transform(documentDF)
for row in result.collect():
text, vector = row
print("Text: [%s] => \nVector: %s\n" % (", ".join(text), str(vector)))
# COMMAND ----------
from pyspark.ml.feature import PCA
pca = PCA().setInputCol("features").setK(2)
pca.fit(scaleDF).transform(scaleDF).show(20, False)
# COMMAND ----------
from pyspark.ml.feature import PolynomialExpansion
pe = PolynomialExpansion().setInputCol("features").setDegree(2)
pe.transform(scaleDF).show()
# COMMAND ----------
from pyspark.ml.feature import ChiSqSelector, Tokenizer
tkn = Tokenizer().setInputCol("Description").setOutputCol("DescOut")
tokenized = tkn\
def pca(df):
pca = PCA(k=10,inputCol="features", outputCol="pca_features")
model = pca.fit(df)
# outData = model.transform(lines)
pcaFeatures = model.transform(lines).select("labels","pca_features")
dfwrite(pcaFeatures,'pcaFeatures')
Feat = sc.parallelize(Feat)
# map feature matrix to spark vectors
from pyspark.mllib.linalg import Vectors
Feat = Feat.map(lambda vec: (Vectors.dense(vec),))
## Define a df with feature matrix
from pyspark.sql import SQLContext
sqlContext = SQLContext(sc)
dfFeat = sqlContext.createDataFrame(Feat,["features"])
dfFeat.printSchema()
## PCA to project Feature matrix to 2 dimensions
from pyspark.ml.feature import PCA
numComponents = 3
pca = PCA(k=numComponents, inputCol="features", outputCol="pcaFeatures")
model = pca.fit(dfFeat)
dfComp = model.transform(dfFeat).select("pcaFeatures")
# get the first two components to lists to be plotted
compX = dfComp.map(lambda vec: vec[0][0]).take(maxWordsVis)
compY = dfComp.map(lambda vec: vec[0][1]).take(maxWordsVis)
compZ = dfComp.map(lambda vec: vec[0][2]).take(maxWordsVis)
## finish Spark session
sc.stop()
## plot
fs=20 #fontsize
w = words[0:maxWordsVis]
import matplotlib.pyplot as plt
train_df = labelIndexer.transform(train_df)
test_df = labelIndexer.transform(test_df)
label_mapping = dict(enumerate(labelIndexer.labels()))
reverse_mapping = {}
for key in label_mapping:
reverse_mapping[label_mapping[key]] = key
# ## Dimensionality reduction
#
# Feature selection is not really supported yet in mllib, therefore, we just applied dim reduction using PCA
# In[509]:
pca = PCA(inputCol="features", outputCol="pca", k=15).fit(train_df)
train_df = pca.transform(train_df)
test_df = pca.transform(test_df)
# ## Classification algorithms
# In[ ]:
rf = RandomForestClassifier(labelCol="indexedResult", featuresCol="pca", numTrees=5000)
#rf = RandomForestClassifier(labelCol="indexedResult", featuresCol="features", numTrees=5000)
model = rf.fit(train_df)
# ## Evaluation & results
def learn_pca_embedding(raw_data_frame):
pca_computer = PCA(k=NBITS, inputCol='features', outputCol='pca')
pca_model = pca_computer.fit(raw_data_frame)
return pca_model
