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fixing scenerio 3 of issue #3995 #4214

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Sep 17, 2019
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fixing scenerio 3 of issue #3995 #4214

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8b1d1e5
fixing scenerio 3 of issue 3995
Lynx1820 Sep 13, 2019
8e1f4bf
Merge remote-tracking branch 'upstream/master'
Lynx1820 Sep 16, 2019
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3 changes: 2 additions & 1 deletion src/Microsoft.ML.LightGbm/LightGbmRankingTrainer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,8 @@ private protected override void CheckDataValid(IChannel ch, RoleMappedData data)
$"Label column '{labelCol.Name}' is of type '{labelType.RawType}', but must be Key or Single.");
}
// Check group types.
ch.CheckParam(data.Schema.Group.HasValue, nameof(data), "Need a group column.");
if(!data.Schema.Group.HasValue)
throw ch.ExceptValue(nameof(data.Schema.Group), "Group column is missing.") ;
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@yaeldekel yaeldekel Sep 15, 2019 •
edited by Lynx1820
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if (!condition)
    throw ...

is the same as doing a check on condition.
#Resolved

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@Lynx1820 Lynx1820 Sep 16, 2019 •
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Hi Yael! Checkparam throws an ArgumentOutOfRangeException, I switched to checking manually, so I can throw a different type of exception. There's also a checkvalue function, but it only works for checking classes. #Resolved

var groupCol = data.Schema.Group.Value;
var groupType = groupCol.Type;
if (!(groupType == NumberDataViewType.UInt32 || groupType is KeyDataViewType))
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