paradiseo/smp/tutorial/Lesson3/README.md
Eremey Valetov c1a44fd2a6 Add tutorial READMEs and fix tutorial return codes
Add README.md files for moeo/tutorial/Lesson{1-4}, smp/tutorial/Lesson{1-4},
and mo/tutorial/Lesson9 — these tutorials had no documentation.

Fix return 1 → return 0 in 28 tutorial main() functions across mo/ and
smp/ that unconditionally returned failure status.
2026-02-28 19:26:10 -05:00

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# Heterogeneous island model
Two islands running different algorithms: an `eoEasyEA` on the QAP problem
and a PSO on a bitstring problem, connected via conversion functions.
## Running
From the `build/smp/tutorial/Lesson3` directory:
```shell
./lesson3_heterogeneous
```
## How it works
When islands use different representations, you need conversion functions
to translate individuals during migration. In this example, `fromBase()`
and `toBase()` convert between the QAP permutation and the PSO bitstring:
```c++
Indi2 fromBase(Indi& i, unsigned size) { ... }
Indi toBase(Indi2& i) { ... }
```
The conversions here are dummy placeholders (they just create random
individuals), but in a real application you would implement meaningful
mappings between representations.