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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 TENSORFLOW_CONTRIB_BOOSTED_TREES_RESOURCES_QUANTILE_STREAM_RESOURCE_H_
#define TENSORFLOW_CONTRIB_BOOSTED_TREES_RESOURCES_QUANTILE_STREAM_RESOURCE_H_
#include "tensorflow/contrib/boosted_trees/lib/quantiles/weighted_quantiles_stream.h"
#include "tensorflow/contrib/boosted_trees/proto/quantiles.pb.h" // NOLINT
#include "tensorflow/contrib/boosted_trees/resources/stamped_resource.h"
#include "tensorflow/core/framework/resource_mgr.h"
#include "tensorflow/core/platform/macros.h"
#include "tensorflow/core/platform/mutex.h"
namespace tensorflow {
namespace boosted_trees {
using QuantileStream =
boosted_trees::quantiles::WeightedQuantilesStream<float, float>;
// Resource for accumulating summaries for multiple columns.
class QuantileStreamResource : public StampedResource {
public:
QuantileStreamResource(const float epsilon, const int32 num_quantiles,
const int64 max_elements, bool generate_quantiles,
int64 stamp_token)
: stream_(epsilon, max_elements),
are_buckets_ready_(false),
epsilon_(epsilon),
num_quantiles_(num_quantiles),
max_elements_(max_elements),
generate_quantiles_(generate_quantiles) {
set_stamp(stamp_token);
}
string DebugString() override { return "QuantileStreamResource"; }
tensorflow::mutex* mutex() { return &mu_; }
QuantileStream* stream(int64 stamp) {
CHECK(is_stamp_valid(stamp));
return &stream_;
}
const std::vector<float>& boundaries(int64 stamp) {
CHECK(is_stamp_valid(stamp));
return boundaries_;
}
void set_boundaries(int64 stamp, const std::vector<float>& boundaries) {
CHECK(is_stamp_valid(stamp));
are_buckets_ready_ = true;
boundaries_ = boundaries;
}
float epsilon() const { return epsilon_; }
int32 num_quantiles() const { return num_quantiles_; }
void Reset(int64 stamp) {
set_stamp(stamp);
stream_ = QuantileStream(epsilon_, max_elements_);
}
bool are_buckets_ready() const { return are_buckets_ready_; }
void set_buckets_ready(bool are_buckets_ready) {
are_buckets_ready_ = are_buckets_ready;
}
bool generate_quantiles() const { return generate_quantiles_; }
void set_generate_quantiles(bool generate_quantiles) {
generate_quantiles_ = generate_quantiles;
}
private:
~QuantileStreamResource() override {}
// Mutex for the whole resource.
tensorflow::mutex mu_;
// Quantile stream.
QuantileStream stream_;
// Stores the boundaries from the previous iteration. Empty during the first
// iteration.
std::vector<float> boundaries_;
// Whether boundaries are created. Initially boundaries are empty until
// set_boundaries are called.
bool are_buckets_ready_;
const float epsilon_;
const int32 num_quantiles_;
// An upper-bound for the number of elements.
int64 max_elements_;
// Generate quantiles instead of approximate boundaries.
// If true, exactly `num_quantiles` will be produced in the final summary.
bool generate_quantiles_;
TF_DISALLOW_COPY_AND_ASSIGN(QuantileStreamResource);
};
} // namespace boosted_trees
} // namespace tensorflow
#endif // TENSORFLOW_CONTRIB_BOOSTED_TREES_RESOURCES_QUANTILE_STREAM_RESOURCE_H_
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