swift coreML:没有"选项"参数的预测函数



在 swift 文档中,MLModel 有两个预测函数

  1. func prediction(来自: MLFeatureProvider( -> MLFeatureProvider.根据给定的输入特征值预测输出特征值。
  2. func prediction(来自: MLFeatureProvider
  3. , options: MLPredictionOptions( -> MLFeatureProvider.根据给定的输入特征值预测输出特征值。

但是,在我的自动生成的 MLModel 类中,未生成带有选项参数的函数。以下代码是我自动生成的预测函数。

func prediction(input: coreML_1denses_80iters_k213_2Input) throws -> coreML_1denses_80iters_k213_2Output {
let outFeatures = try model.prediction(from: input)
let result = coreML_1denses_80iters_k213_2Output(output1: outFeatures.featureValue(for: "output1")!.multiArrayValue!, lstm_1_h_out: outFeatures.featureValue(for: "lstm_1_h_out")!.multiArrayValue!, lstm_1_c_out: outFeatures.featureValue(for: "lstm_1_c_out")!.multiArrayValue!)
return result
}
func prediction(input1: MLMultiArray, input2: MLMultiArray, lstm_1_h_in: MLMultiArray?, lstm_1_c_in: MLMultiArray?) throws -> coreML_1denses_80iters_k213_2Output {
let input_ = coreML_1denses_80iters_k213_2Input(input1: input1, input2: input2, lstm_1_h_in: lstm_1_h_in, lstm_1_c_in: lstm_1_c_in)
return try self.prediction(input: input_)
}

注意: 顺便说一句,我想找到带有"options"参数的预测函数的原因是以下错误消息:

[coreml] Cannot evaluate a sequence of length 600, which is longer than maximum of 400.

我找到了一个解决方案,即在预测函数中添加一个forceCPU标志。该选项可以在MLPredictionOptions中找到,称为"usesCPUOnly"。但是,我找不到放置选项的地方。

执行此操作的一种方法是在自动生成的类的extension中添加您自己的预测方法(在不同的源文件中(。

感谢@Matthijs霍勒曼斯。我找到了解决方案。只需编写我自己的扩展并像这样覆盖预测函数。

func prediction(input: model_1denses_50iters_k213Input) throws -> model_1denses_50iters_k213Output {
let options = MLPredictionOptions()
options.usesCPUOnly = true
let outFeatures = try model.prediction(from: input, options:options)
let result = model_1denses_50iters_k213Output(output1: outFeatures.featureValue(for: "output1")!.multiArrayValue!, lstm_85_h_out: outFeatures.featureValue(for: "lstm_85_h_out")!.multiArrayValue!, lstm_85_c_out: outFeatures.featureValue(for: "lstm_85_c_out")!.multiArrayValue!)
return result
}

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