MlModel prediction returns nil

Asked Apr 10 '21 at 15:31

Active Apr 10 '21 at 15:31

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I converted an ONNX model to mlmodel and I'm unable to use the prediction function. here is my model's input and output: [enter image description here][1] [1]: https://i.stack.imgur.com/6mY4H.png

i'm initializing the model and the input like this:

var model: dont_touch_model! 
var modelInputVector = try! MLMultiArray(shape: [1,1,13], dataType: MLMultiArrayDataType.float32)

I fill the vector with motion data like this:

modelInputVector[[0, 0, 0] as [NSNumber]] = deviceMotion.userAcceleration.x as NSNumber
modelInputVector[[0, 0, 1] as [NSNumber]] = deviceMotion.userAcceleration.y as NSNumber
modelInputVector[[0, 0, 2] as [NSNumber]] = deviceMotion.userAcceleration.z as NSNumber

I try to execute a prediction:

let modelInput = dont_touch_modelInput(sequenceinput: modelInputVector)
var modelOutput = try! model.prediction(input: modelInput)

and I get this error message:

"Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value"

can someone please help?

asked Apr 10 '21 at 15:31

Yarden

You never load the model anywhere so your `model` variable is nil. – Matthijs Hollemans Apr 10 '21 at 19:48
I added it manually to Xcode and initialized it with: var model: dont_touch_model! – Yarden Apr 11 '21 at 05:50
That doesn't load the model. You need to write `var model = dont_touch_model()` – Matthijs Hollemans Apr 11 '21 at 10:02
ok I did that and I still get the same error – Yarden Apr 12 '21 at 07:53

MlModel prediction returns nil

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