[SYSTEMDS-1679] Add a new threshold utility function

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 0.15
• Epic Link: Deep Learning DML Library
• Assignee: Fei Hu
• Reporter: Mike Dusenberry
• Created: 09/Jun/17 20:14
• Updated: 09/Sep/17 05:25
• Resolved: 16/Jun/17 23:19

Description

We should add a new threshold utility function (in nn/util.dml) that accepts a matrix X and a threshold parameter thresh and returns an indicator matrix out with values in {0, 1} depending on whether or not the values in X are above thresh. We could use this, for example, for determining the predicted class in a binary classification problem given the output of a sigmoid layer.

We should also add a test case in nn/test/test.dml.