// Copyright 2014 Google Inc. All Rights Reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Author: nevena@google.com (Nevena Lazic)

#include "lossmin/losses/loss-function.h"
#include <float.h>
#include <math.h>

namespace lossmin {

float LossFunction::BatchLoss(
    const Weights &weights, const InstanceSet &instances,
    const LabelSet &labels) const {
  float loss = 0.0f;
  for (int i = 0; i < instances.rows(); ++i) {
    loss += ExampleLoss(weights, instances, labels, i);
  }
  return loss;
}

void LossFunction::BatchGradient(
    const Weights &weights, const InstanceSet &instances,
    const LabelSet &labels, Weights *gradient) const {
  for (int i = 0; i < instances.rows(); ++i) {
    AddExampleGradient(weights, instances, labels, i, 1.0f, 1.0f, gradient);
  }
}

}  // namespace lossmin