message: Annotate the performance database with expected distribution of values.
diff: @@ -48,6 +48,16 @@ message OpInfo {
  DeviceProperties device = 4;
  }
  +message NormalDistribution {
  + double mu = 1;
  + double sigma = 2;
  +}
  +
  +message LogNormalDistribution {
  + double mu = 1;
  + double sigma = 2;
  +}
  +
  // Performance data for tensorflow operations
  message OpPerformance {
  // The op
  @@ -75,6 +85,12 @@ message OpPerformance {
  // Percentage of theoretical memory performance.
  double memory_efficiency = 8;
  + // Expected execution time, modeled using one of 2 possible distributions.
  + oneof execution_time {
  + NormalDistribution execution_time_normal = 10;
  + LogNormalDistribution execution_time_log_normal = 11;
  + };
  +
  // Memory usage data for a tensorflow operation.
  message OpMemory {
  // The output information may have memory usage and output shapes.
  