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Apply some optimisations in PoseNet #289

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Apply some optimisations in PoseNet #289

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f96df63
Avoid double array indexing.
valeriyvan Feb 28, 2021
e1f73ef
Avoid excessive array initialization.
valeriyvan Feb 28, 2021
dcdeb41
Use indices
valeriyvan Feb 28, 2021
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12 changes: 8 additions & 4 deletions lite/examples/posenet/ios/PoseNet/Extensions/TFLiteExtension.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -32,9 +32,13 @@ extension Data {

/// Convert a Data instance to Array representation.
func toArray<T>(type: T.Type) -> [T] where T: AdditiveArithmetic {
var array = [T](repeating: T.zero, count: self.count / MemoryLayout<T>.stride)
_ = array.withUnsafeMutableBytes { self.copyBytes(to: $0) }
return array
[T].init(unsafeUninitializedCapacity: self.count / MemoryLayout<T>.stride) {
bufPtr, initializedCount in
bufPtr.withMemoryRebound(to: UInt8.self) { reboundBufPtr in
self.withUnsafeBytes { _ = reboundBufPtr.initialize(from: $0) }
}
initializedCount = bufPtr.count
}
}
}

Expand All @@ -55,7 +59,7 @@ struct FlatArray<Element: AdditiveArithmetic> {
}

var result = 0
for i in 0..<dimensions.count {
for i in dimensions.indices {
guard dimensions[i] > index[i] else {
fatalError("Invalid index: \(index[i]) is bigger than \(dimensions[i])")
}
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5 changes: 3 additions & 2 deletions lite/examples/posenet/ios/PoseNet/ModelDataHandler/ModelDataHandler.swift
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Expand Up @@ -214,8 +214,9 @@ class ModelDataHandler {
var maxCol = 0
for row in 0..<Model.output.height {
for col in 0..<Model.output.width {
if heats[0, row, col, keypoint] > maxValue {
maxValue = heats[0, row, col, keypoint]
let value = heats[0, row, col, keypoint]
if value > maxValue {
maxValue = value
maxRow = row
maxCol = col
}
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