Hello,
I am going through Random Forest example given in MADlib's User Documentation:
http://madlib.incubator.apache.org/docs/latest/group__grp__random__forest.html#examples
In both cases when I run "SELECT madlib.forest_train( ... ... )" exactly as it
is shown in
steps 1 and 2 in the example page, I get the following error:
ERROR: plpy.SPIError: Function
"madlib._dt_apply(madlib.bytea8,madlib.bytea8,madlib.bytea8,smallint,smallint,smallint,boolean,integer)":
Invalid type conversion. Simple type supplied but backend expects composite
type. (plpython.c:4648)
CONTEXT: Traceback (most recent call last):
PL/Python function "forest_train", line 39, in <module>
sample_ratio
PL/Python function "forest_train", line 553, in forest_train
PL/Python function "forest_train", line 2192, in _tree_train_using_bins
PL/Python function "forest_train", line 1162, in _one_step
PL/Python function "forest_train"
Relevant Info:
"PostgreSQL 8.2.15
(Greenplum Database 4.2.0 build 1)
(HAWQ 1.3.0.0 build 12954)
"MADlib version: 1.9, git revision: rc/v1.9-rc1
Can anyone please explain what the reasons behind this error message? Your help
will be appreciated.
Thanks.
Nurur
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