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[TF] Refactor gradients computation with expandingShape #24249

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Merged
rxwei merged 4 commits into from
Apr 24, 2019
Merged

[TF] Refactor gradients computation with expandingShape #24249

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070511a
Merge pull request #1 from apple/tensorflow
sgugger Apr 24, 2019
44d3c0b
Refactor with new expandingShape function
sgugger Apr 24, 2019
d135786
Add space
rxwei Apr 24, 2019
51e3eff
Add space
rxwei Apr 24, 2019
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14 changes: 6 additions & 8 deletions stdlib/public/TensorFlow/Gradients.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -577,10 +577,9 @@ extension Tensor where Scalar : TensorFlowFloatingPoint {
squeezingAxes axes: Tensor<Int32>
) -> (Tensor, (Tensor) -> Tensor) {
let value = sum(squeezingAxes: axes)
return (value, { [shape = shapeTensor] in
var res = $0
for i in axes.array.scalars { res = res.expandingShape(at: Int(i)) }
return res.broadcast(toShape: shape)
return (value, { [shape = shapeTensor] v in
let unsqueezed = v.expandingShape(at: axes.scalars.map { Int($0) })
return unsqueezed.broadcast(toShape: shape)
})
}

Expand All @@ -599,10 +598,9 @@ extension Tensor where Scalar : TensorFlowFloatingPoint {
) -> (Tensor, (Tensor) -> Tensor) {
let value = mean(squeezingAxes: axes)
let count = Raw.gather(params: shapeTensor, indices: axes).product()
return (value, { [shape = shapeTensor] in
var res = $0
for i in axes.array.scalars { res = res.expandingShape(at: Int(i)) }
return res.broadcast(toShape: shape) / Tensor(count)
return (value, { [shape = shapeTensor] v in
let unsqueezed = v.expandingShape(at: axes.scalars.map { Int($0) })
return unsqueezed.broadcast(toShape: shape) / Tensor(count)
})
}
}
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