// Copyright 2004-present Facebook. All Rights Reserved.

// File: negate_gradient_op.h

#pragma once
#include "caffe2/core/context.h"
#include "caffe2/core/operator.h"

namespace caffe2 {

template <class Context>
class NegateGradientOp final : public Operator<Context> {
 public:
  USE_SIMPLE_CTOR_DTOR(NegateGradientOp)
  USE_OPERATOR_CONTEXT_FUNCTIONS;

  bool RunOnDevice() override {
    const auto& in = Input(0);
    auto* out = Output(0);
    if (out != &in) {
      out->CopyFrom(in, /* async */ true);
    }
    return true;
  }
};

} // namespace caffe2