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Made 'Tensor.gathering(where:alongAxis:)' differentiable. #271

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Jun 21, 2019
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Made 'Tensor.gathering(where:alongAxis:)' differentiable. #271

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6 changes: 2 additions & 4 deletions Sources/TensorFlow/Operators/Basic.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -464,12 +464,10 @@ public extension Tensor {
/// - Returns: `(self.rank - K + 1)`-dimensional tensor populated by entries in this tensor
/// corresponding to `true` values in `mask`.
@inlinable
// @differentiable(wrt: self where Scalar: TensorFlowFloatingPoint)
@differentiable(wrt: self where Scalar: TensorFlowFloatingPoint)
func gathering(where mask: Tensor<Bool>, alongAxis axis: Int = 0) -> Tensor {
precondition(mask.rank != 0, "The boolean mask cannot be a scalar.")
// TODO: Remove once control flow AD is supported.
let rank = self.rank
let posAxis = { axis < 0 ? axis + rank : axis }()
let posAxis = Swift.withoutDerivative(at: self.rank) { r in axis < 0 ? axis + r : axis }
let leadingSize = shapeTensor[posAxis ..< posAxis + mask.rank].product().rankLifted()
let reshapedTensor = reshaped(
toShape: Tensor<Int32>(concatenating: [
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