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How to Fix the Random Seed in Julia 📂Julia

How to Fix the Random Seed in Julia

Explanation1

In Julia, the random seed can be fixed as follows:

  • seed!([rng=default_rng()], seed) -> rng
  • seed!([rng=default_rng()]) -> rng

The input variable rng stands for Random Number Generator, which refers to the algorithm used for drawing random numbers. The Random package offers the following options:

  • TaskLocalRNG: This is the default setting.
  • Xoshiro
  • RandomDevice
  • MersenneTwister

Code

By fixing the seed to 0, drawing three times, and then fixing it again to 0 and drawing three times, it can be verified that the same values are obtained.

julia> using Random

julia> Random.seed!(0)
TaskLocalRNG()

julia> rand(1)
1-element Vector{Float64}:
 0.4056994708920292

julia> rand(1)
1-element Vector{Float64}:
 0.06854582438651502

julia> rand(1)
1-element Vector{Float64}:
 0.8621408571954849

julia> Random.seed!(0)
TaskLocalRNG()

julia> rand(3)
3-element Vector{Float64}:
 0.4056994708920292
 0.06854582438651502
 0.8621408571954849

  1. https://docs.julialang.org/en/v1/stdlib/Random/index.html#Random.seed! ↩︎