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// Copyright 2017 The TensorFlow Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// =============================================================================
#ifndef THIRD_PARTY_TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_LEARNER_COMMON_STATS_FEATURE_SPLIT_CANDIDATE_H_
#define THIRD_PARTY_TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_LEARNER_COMMON_STATS_FEATURE_SPLIT_CANDIDATE_H_
#include "tensorflow/contrib/boosted_trees/lib/learner/common/stats/split-stats.h"
#include "tensorflow/contrib/boosted_trees/proto/tree_config.pb.h"
namespace tensorflow {
namespace boosted_trees {
namespace learner {
namespace stochastic {
// FeatureSplitCandidate holds the split candidate node along with the stats.
struct FeatureSplitCandidate {
// Empty split candidate.
explicit FeatureSplitCandidate(const int output_length)
: feature_column_slot_id(kInvalidFeatureColumnSlot),
split_stats(output_length) {}
// Feature binary split candidate.
FeatureSplitCandidate(const int64 fc_slot_id,
const boosted_trees::trees::TreeNode& node,
const SplitStats& stats)
: feature_column_slot_id(fc_slot_id),
tree_node(node),
split_stats(stats) {}
// Globally unique slot Id identifying the feature column
// used in this split candidates.
int64 feature_column_slot_id;
// Tree node for the candidate split.
boosted_trees::trees::TreeNode tree_node;
// Split stats.
SplitStats split_stats;
// Invalid feature column slot reserved value.
static constexpr int64 kInvalidFeatureColumnSlot = -1;
};
} // namespace stochastic
} // namespace learner
} // namespace boosted_trees
} // namespace tensorflow
#endif // THIRD_PARTY_TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_LEARNER_COMMON_STATS_FEATURE_SPLIT_CANDIDATE_H_
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