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From "Dylan Hutchison (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1980) Integer matrices
Date Mon, 30 Oct 2017 03:58:00 GMT
Dylan Hutchison created SYSTEMML-1980:
-----------------------------------------

             Summary: Integer matrices
                 Key: SYSTEMML-1980
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1980
             Project: SystemML
          Issue Type: Bug
            Reporter: Dylan Hutchison
            Priority: Minor


Under rare conditions a matrix can have INT ValueType and execute correctly.  For example
the program

```
X= Rand( rows=2, cols=2, min=1, max=2)
R = cbind(as.matrix(nrow(X)) * 2, as.matrix(ncol(X)))
```

would throw an exception by the HopDagValidator because the Hops produced look like
(here, "MI" means matrix data type and integer value type):

```
----GENERIC (lines 28-0) [recompile=false]
------(33) u(cast_as_matrix) ([2]) [1,1,1000,1000,-1]MI [0,0,0 -> -MB]
------(35) b(*) (33,[2]) [1,1,1000,1000,-1]MI [0,0,0 -> -MB], CP
------(37) u(cast_as_matrix) ([2]) [1,1,1000,1000,-1]MI [0,0,0 -> -MB]
------(38) b(cbind) (35,37) [1,2,1000,1000,-1]MI [0,0,0 -> -MB], CP
------(44) PWrite R (38,[target/tes...],[false],[TEXT],[false],[,]) [1,2,-1,-1,-1]MI [0,0,0
-> -MB], CP
```

If this is intended, the HopDagValidator should be relaxed to allow integer matrices, and
the fact that integer matrices are legal needs to be documented and scoped.



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