Orhan Kislal created MADLIB-1255:
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Summary: MLP: NaN loss for some hyperparam settings
Key: MADLIB-1255
URL: https://issues.apache.org/jira/browse/MADLIB-1255
Project: Apache MADlib
Issue Type: Bug
Components: Module: Neural Networks
Reporter: Orhan Kislal
w/ [~njayaram] For the boston dataset (duplicated for multiple groups testing)
the following query produces NaN for the loss.
{code:java}
SELECT setseed(0);
DROP TABLE IF EXISTS temp3;
DROP TABLE IF EXISTS temp3_summary;
DROP TABLE IF EXISTS temp3_standardization;
SELECT madlib.mlp_regression(
'madlibtestdata.boston_grouping'::varchar,
'temp3'::varchar,
'ARRAY[crim, zn, indus, chas, nox, rm, age, dis, rad, tax, ptratio,
b, lstat]'::varchar,
'medv'::varchar,
ARRAY[100]::integer[],
'learning_rate_init=0.0025, lambda=0.00001,
learning_rate_policy=step, gamma=0.8, iterations_per_step=250,
n_iterations=1500, tolerance=0, momentum=0'::varchar,
'tanh'::varchar,
NULL,
False,
False,
'grp_col'
);
SELECT loss FROM temp3 WHERE grp_col=2;
{code}
Dataset: [https://www.cs.toronto.edu/~delve/data/boston/bostonDetail.html]
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