sumGPU function

GPUTensor<Scalar> sumGPU(
  1. GPUTensor<Vector> v,
  2. CommandBuffer tape, {
  3. GPUTensor<Scalar>? outTensor,
})

///////////////////////////////// Reductions (600-699) /// ///////////////////////////////// Appends commands for summing all elements of vector v to tape.

Implementation

/// Appends commands for summing all elements of vector [v] to [tape].
GPUTensor<Scalar> sumGPU(GPUTensor<Vector> v, CommandBuffer tape,
    {GPUTensor<Scalar>? outTensor}) {
  int N = v.shape[0];
  GPUTensor<Scalar> out = outTensor ?? GPUTensor<Scalar>(0.0);

  tape.putInt(OP_SUM_REDUCE);
  tape.putString(v.id);
  tape.putString(out.id);

  out.creator = GPUNode(
    [v],
    (CommandBuffer bTape) {
      bTape.putInt(OP_SUM_REDUCE_BACKWARD);
      bTape.putString(out.gradId);
      bTape.putString(v.gradId);
    },
    opName: 'sum_vectorGPU',
    cost: N,
  );

  return out;
}