Mike Dusenberry created SYSTEMML-676:
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Summary: Improve PyDML Slicing
Key: SYSTEMML-676
URL: https://issues.apache.org/jira/browse/SYSTEMML-676
Project: SystemML
Issue Type: Improvement
Reporter: Mike Dusenberry
Currently, slicing correctly uses inclusive lower and exclusive upper bounds.
However, a really useful piece of slicing syntax we are currently missing from
PyDML is the ability to have implicit lower or upper bounds, i.e., {{X[ :3, ]}}
should return all rows up to (but not including) 3. This means that the
implicit lower bound is 0. Similarly, {{X[ 2:, ]}} should return all rows
starting at row 2 (0-based), which implies that the upper bound is equal to the
number of rows of {{X}}.
We should update the grammar to allow these cases, row both row and column
slicing. More generally, {{X[ :,: ]}}, should also be valid, regardless if it
is useful.
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