def within_group_scatter(data: pyspark.sql.DataFrame, features, response,
targets):
p = len(features)
sw = numpy.zeros((p, p))
for target in targets:
df_t = data.filter("{} == '{}'".format(response, target))
X_t = RowMatrix(df_t.select(features).rdd.map(numpy.array))
sw += X_t.computeCovariance().toArray() * (df_t.count() - 1)
return sw
def get_gmm(self, k, sample_fraction=None, retry=True):
if k == 1:
if sample_fraction:
data = self.mllib_training_data.sample(False, sample_fraction)
else:
data = self.mllib_training_data
row_matrix = RowMatrix(data)
mean = row_matrix.computeColumnSummaryStatistics().mean()
cov = row_matrix.computeCovariance().toArray()
weights = [1.0]
gaussians = [Gaussian(mean, cov)]
log_likelihood = None
else:
m = self.fit_ml_model(k,
sample_fraction=sample_fraction,
retry=retry)
weights = m.weights
gaussians = [
Gaussian(g.mean, g.cov.toArray())
for g in m.gaussiansDF.collect()
]
log_likelihood = m.summary.logLikelihood
return GaussianMixtureModel(weights, gaussians, log_likelihood)
#matrix = Matrices.dense(nrows, ncols, rdd)
print("ncol: %d, nrow %d" % (ncols, nrows))
coord_mat = CoordinateMatrix(rdd.map(tuple))
print("num rows in matrix %d" % coord_mat.numRows())
print("finished using pyspark")
#________________________________________________-
print("now use SparkSession")
from pyspark.sql import SparkSession
spark = SparkSession.builder.getOrCreate()
df_2 = spark.read.option("delimiter", " ").csv('./data/lpi_ceria3d_b.mtx',
header=False,
inferSchema=True)
df_2.printSchema()
#coord_mat_2 = CoordinateMatrix(df_2.rdd.map(tuple))
row_mat = RowMatrix(df_2.rdd.map(tuple))
print("num rows in row matrix %d, num_cols %d" %
(row_mat.numRows(), row_mat.numCols()))
print("print covariance")
print(row_mat.computeCovariance())
dm = Matrices.dense(3, 1, [4, 5, 6])
print("multiply row Matrix")
result = row_mat.multiply(dm)
