'ML.net for object cognitive

I used the Microsoft Custom vision try to build a Onnx model and used it on ML.net object cognitive .(I create two label to recognize Samsung and Iphone but I only give each 20 pictures to build the model. ) But my program can't detect the picture that I haven't labeled .Only can detect the picture which have been labeled. Is this my program problem? or the Onnx model problem ? (My Custom vision model recall and precision percentage only have 40%)

This is the program that I used it. https://github.com/jwood803/MLNetExamples/blob/master/MLNetExamples/CustomVisionOnnx/Program.cs



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