Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/11858#issuecomment-199143362
When I caused a failure by modifying the checks in the test, it gave an
error message like this. Note this is to verify the error message; it is not
an actual test failure example:
```
[info] Expected 0.5 and 1000000.4989503149 to be within 0.05 using
absolute tolerance.
[info] validateModelFit:
[info] piData: [-0.6931471805599453, -1.2039728043259361,
-1.6094379124341003]
[info] thetaData: [-0.6931471805599453, -3.912023005428146,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-3.912023005428146, -0.916290731874155]
[info] [-3.912023005428146, -0.35667494393873245, -2.3025850929940455,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-3.912023005428146]
[info] [-3.912023005428146, -3.912023005428146, -0.5108256237659907,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-3.912023005428146, -3.912023005428146, -3.912023005428146, -3.912023005428146,
-1.2039728043259361]
[info] model.labels: [0.0, 1.0, 2.0]
[info] model.pi: [-0.6952487575155715, -1.2129771999650796,
-1.5909161132025096]
[info] model.theta: [-0.6967594662458589, -3.7882040913369224,
-3.9722971277792594, -3.753417975251507, -3.8334606829250433,
-3.8521528159371963, -3.86163155989174, -3.930624431378691,
-3.8808629218196273, -4.0269555403171235, -3.930624431378691,
-0.9227216222044454]
[info] [-3.778491612803623, -0.35931949410361774, -2.174953422496711,
-3.823612048084093, -3.823612048084093, -3.5912800707154764,
-3.9549480501451795, -3.8871254538064184, -3.778491612803623,
-4.126798307071839, -4.106179019869103, -4.027707404427607]
[info] [-3.8360251366561937, -3.63123072401018, -0.4893159402781082,
-4.036695832118345, -3.7700671688643963, -3.906642703870147,
-4.219017388912299, -3.8825451522910863, -3.9313353164605185,
-3.7700671688643963, -3.813552280804135, -1.2166405726396397]
(TestingUtils.scala:79)
```
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