using tensorflow::ops::Div;
using tensorflow::ops::DivNoNan;
using tensorflow::ops::MatMul;
using tensorflow::ops::Mul;
using tensorflow::ops::Neg;
using tensorflow::ops::OnesLike;
using tensorflow::ops::SqrtGrad;

namespace tensorflow {
namespace gradients {
namespace {

static Status SafeConj(AbstractContext* ctx, AbstractTensorHandle* const input,
                       AbstractTensorHandle** output, const char* name) {

  )>;

//===----------------------------------------------------------------------===//
// Sqrt op patterns.
//===----------------------------------------------------------------------===//

// SqrtGrad(y, dy) = dy * 0.5 / y
def LowerSqrtGradOp : Pat<
  (TF_SqrtGradOp $y, $dy),
  (TF_DivOp
    (TF_MulOp $dy, (TF_ConstOp (GetScalarOfFloatType<"0.5"> $dy))),
    $y
  )>;