= ReCo.jl

image:https://img.shields.io/badge/code%20style-blue-4495d1.svg[Code Style: Blue, link=https://github.com/invenia/BlueStyle]

**Re**inforcement learning of **co**llective behavior.

== Setup

The steps from the setup have to be followed before running anything in the following sections.

=== Launch Julia

To activate the environment, navigate to the main directory `/ReCo.jl` and then run the following to launch Julia:

[source, bash]
----
cd ReCo.jl
julia --threads auto
----

`auto` automatically sets the number of threads to use. If you want to use a specific number `N` of threads, replace `auto` with `N`.

=== Acitivating environment

After launching Julia, the package environment has to be activated by running the follwing in the REPL:

[source, julia]
----
using Pkg
Pkg.activate(".")
----

=== Install dependencies

After activating the package environment, run the follwing to install the package dependencies:

[source, julia]
----
Pkg.instantiate()
----

== Run simulation

Import the package:

[source, julia]
----
using ReCo
----

Initialize a simulation with 100 particles having a self-propulsion velocity of 40.0 and return the relative path to the simulation directory:

[source, julia]
----
sim_dir = init_sim(100, 40.0)
----

Run the simulation:

[source, julia]
----
run_sim(sim_dir, duration=20.0)
----

The values for the number of particles, self-propulsion velocity and simulation duration are used here as an example. For more information about possible values and other optional arguments, press `?` in the REPL after running `using ReCo`. Then type `init_sim` or `run_sim` followed by pressing enter. This will show the method's documention.

== Run reinforcement learning
Import the package:

[source, julia]
----
using ReCo
----

Run a reinforcement learning process and return the environment helper and the the path of the process directory relative to the directory `ReCo.jl`:
[source, julia]
----
env_helper, rl_dir = run_rl(ENVTYPE)
----

ENVTYPE has to be replaced by one of the environments named after the file names in the directory `ReCo.jl/RL/Envs`, for example: `LocalCOMEnv`. A description of an environment is included at the beginning of the corresponding file.

For more information about all possible optional arguments, press `?` in the REPL after running `using ReCo`. Then type `run_rl` followed by pressing enter.

`env_helper` has the abstract type `EnvHelper`. To access the Q-matrix, enter the following:

[source, julia]
----
env_helper.shared.agent.policy.learner.approximator.table
----

To generate a LaTeX table with the states and actions combintation names for the Q-matrix, run the follwing:

[source, julia]
----
include("src/RL/latex_table.jl")
latex_rl_table(env_helper, FILENAME)
----

FILENAME has to be replaced by the wanted file name of the `.tex` file. This file can then be found under `ReCo.jl/exports/FILENAME`.

To access the rewards, run the following:

[source, julia]
----
env_helper.shared.hook.rewards
----

To plot the rewards, run the following:

[source, julia]
----
plot_rewards(rl_dir)
----

To plot the mean of kappa as the ratio of the eigenvalues of the gyration tensor, run the following:

[source, julia]
----
include("analysis/mean_kappa.jl")
plot_mean_kappa(; rl_dir=rl_dir, n_last_episodes=N_LAST_EPISODES)
----

`N_LAST_EPISODES` is the number of the last episodes of the learning process to average over.

== Run analysis

After running the following command blocks in the REPL, the output can be found in the directory `exports/graphics`.

=== Mean squared displacement

[source, julia]
----
include("analysis/mean_squared_displacement.jl")
run_msd_analysis()
run_random_walk()
----

=== Radial distribution function

[source, julia]
----
include("analysis/radial_distribution_function/radial_distribution_function.jl")
run_radial_distribution_analysis()
----