syntax = "proto3";

option cc_enable_arenas = true;

package boosted_trees;

message QuantileConfig {
  // Maximum eps error when computing quantile summaries.
  double eps = 1;
  // Number of quantiles to generate.
  int64 num_quantiles = 2;
}

message QuantileEntry {
  // Value for the entry.
  float value = 1;
  // Weight for the entry.
  float weight = 2;
  // We need the minimum and maximum rank possible for this entry.
  // Rank is 0.0 for the absolute minimum and sum of the weights for the maximum
  // value in the input.
  float min_rank = 3;
  float max_rank = 4;
}

message QuantileSummaryState {
  repeated QuantileEntry entries = 1;
}

message QuantileStreamState {
  repeated QuantileSummaryState summaries = 1;
}