[ https://issues.apache.org/jira/browse/SYSTEMML-903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477670#comment-15477670 ]
Nick Pentreath commented on SYSTEMML-903: ----------------------------------------- cc [~deron] [~niketanpansare] > [Python API] Sparse to dense conversion is not yet implemented > -------------------------------------------------------------- > > Key: SYSTEMML-903 > URL: https://issues.apache.org/jira/browse/SYSTEMML-903 > Project: SystemML > Issue Type: Bug > Reporter: Nick Pentreath > > Hitting this exception when doing something (admittedly trivial) in Python > API, following on from the website example code: > {code} > import numpy as np > from sklearn import datasets > import systemml as sml > from pyspark.sql import SQLContext > # Load the diabetes dataset > diabetes = datasets.load_diabetes() > # Use only one feature > diabetes_X = diabetes.data[:, np.newaxis, 2] > ## -- End pasted text -- > In [16]: X = sml.matrix(diabetes_X) > In [17]: diff = X - X > In [18]: diff.toNumPyArray() > {code} > Throws: > {code} > Py4JJavaError: An error occurred while calling > z:org.apache.sysml.runtime.instructions.spark.utils.RDDConverterUtilsExt.convertMBtoPy4JDenseArr. > : org.apache.sysml.runtime.DMLRuntimeException: Sparse to dense conversion is > not yet implemented > at > org.apache.sysml.runtime.instructions.spark.utils.RDDConverterUtilsExt.convertMBtoPy4JDenseArr(RDDConverterUtilsExt.java:373) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:231) > at > py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:381) > at py4j.Gateway.invoke(Gateway.java:259) > at > py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:133) > at py4j.commands.CallCommand.execute(CallCommand.java:79) > at py4j.GatewayConnection.run(GatewayConnection.java:209) > at java.lang.Thread.run(Thread.java:745) > {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)