// Copyright 2018 Google Inc. 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.

/// Parameters that determine the mapping of quantized values to real values. Quantized values can
/// be mapped to float values using the following conversion:
/// `realValue = scale * (quantizedValue - zeroPoint)`.
public struct QuantizationParameters: Equatable, Hashable {
  /// Difference between real values corresponding to consecutive quantized values differing by 1.
  /// For example, the range of quantized values for `UInt8` data type is [0, 255].
  public let scale: Float

  /// Quantized value that corresponds to the real 0 value.
  public let zeroPoint: Int

  /// Creates a new quantization parameters instance.
  ///
  /// - Parameters:
  ///   - scale: Scale value for asymmetric quantization.
  ///   - zeroPoint: Zero point for asymmetric quantization.
  init(scale: Float, zeroPoint: Int) {
    self.scale = scale
    self.zeroPoint = zeroPoint
  }
}
