return scope.status();
}
REGISTER_GRADIENT_OP("Abs", AbsGrad);

Status NegGrad(const Scope& scope, const Operation& op,
               const std::vector<Output>& grad_inputs,
               std::vector<Output>* grad_outputs) {
  // dx = -dy;
  grad_outputs->push_back(Neg(scope, grad_inputs[0]));
  return scope.status();
}
REGISTER_GRADIENT_OP("Neg", NegGrad);

Status InvGrad(const Scope& scope, const Operation& op,

s.gazeTarget_);const rotMatrix=mat4.create();mat4.rotate(rotMatrix,rotMatrix,-deg2rad(this.rotation_[0]),[1,0,0]);mat4.rotate(rotMatrix,rotMatrix,-deg2rad(this.rotation_[1]),[0,1,0]);vec4.transformMat4(eyeVector,eyeVector,rotMatrix);this.rotation_[0]+=delta[1];this.rotation_[1]-=delta[0];mat4.identity(rotMatrix);mat4.rotate(rotMatrix,rotMatrix,deg2rad(this.rotation_[1]),[0,1,0]);mat4.rotate(rotMatrix,rotMatrix,deg2rad(this.rotation_[0]),[1,0,0]);vec4.transformMat4(eyeVector,eyeVector,rotMatrix);...