Just in case someone stumbles upon this while following the getting started guide.
If you get an error similar to: Given input shape: (1, 3, 28, 28) has different dimension from model input shape: (1, 1, 28, 28) for input: Input3 at axis: 1
Make sure that the
image is imported correctly, which means not scaled to the nearest Non-power of 2.
The input tensor expects a texture of 28x28, and Unity will try to import it as a 32x32.
Hope this helps.