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7 changes: 4 additions & 3 deletions src/Microsoft.ML.OnnxTransformer/OnnxSequenceType.cs
Original file line number Diff line number Diff line change
Expand Up @@ -56,9 +56,10 @@ public sealed class OnnxSequenceTypeAttribute : DataViewTypeAttribute
{
private Type _elemType;

/// <summary>
/// Create a sequence type.
/// </summary>
// Make default constructor obsolete.
// Use default constructor will left the _elemType field empty and cause exception in methods using _elemType.
// User will receive compile error when try to use [OnnxSequenceType] attribute directly without specify sequence type
[Obsolete("Please specify sequence type when use OnnxSequenceType Attribute", true)]
public OnnxSequenceTypeAttribute()
{
}
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Original file line number Diff line number Diff line change
Expand Up @@ -65,4 +65,4 @@ public void OnnxSequenceTypeWithColumnNameAttributeTest()

}
}
}
}