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Show error message when an old VAE encoder is used #177

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Show error message when an old VAE encoder is used #177

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Show error message when an old VAE encoder is used.
pcuenca Apr 30, 2023
6e75c89
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pcuenca Apr 30, 2023
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15 changes: 14 additions & 1 deletion swift/StableDiffusion/pipeline/Encoder.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,20 @@ public struct Encoder: ResourceManaging {

var inputDescription: MLFeatureDescription {
try! model.perform { model in
model.modelDescription.inputDescriptionsByName["z"]!
guard let zInputDescription = model.modelDescription.inputDescriptionsByName["z"] else {
let modelVersion = model.modelDescription.metadata[MLModelMetadataKey.versionString] ?? "unknown version"
fatalError(
"""

The VAE encoder of this model (\(modelVersion)) is not compatible \
with this version of `ml-stable-diffusion`. Please, convert the VAE encoder again using the latest \
version of this package and following the instructions here: \
https://github.com/apple/ml-stable-diffusion#-converting-models-to-core-ml
We'd appreciate if you could then submit the new VAE encoder as a PR to the repo from which this model \
was downloaded.
""")
}
return zInputDescription
}
}

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