Sample a program and inspirations from a specific island without modifying current_island This method is thread-safe and doesn't modify shared state, avoiding race conditions when multiple workers sample from different islands concurrently. Uses the same exploratio
(
self, island_id: int, num_inspirations: Optional[int] = None
)
| 407 | return parent, inspirations |
| 408 | |
| 409 | def sample_from_island( |
| 410 | self, island_id: int, num_inspirations: Optional[int] = None |
| 411 | ) -> Tuple[Program, List[Program]]: |
| 412 | """ |
| 413 | Sample a program and inspirations from a specific island without modifying current_island |
| 414 | |
| 415 | This method is thread-safe and doesn't modify shared state, avoiding race conditions |
| 416 | when multiple workers sample from different islands concurrently. |
| 417 | |
| 418 | Uses the same exploration/exploitation/random strategy as sample() to ensure |
| 419 | consistent behavior between single-process and parallel execution modes. |
| 420 | |
| 421 | Args: |
| 422 | island_id: The island to sample from |
| 423 | num_inspirations: Number of inspiration programs to sample (defaults to 5) |
| 424 | |
| 425 | Returns: |
| 426 | Tuple of (parent_program, inspiration_programs) |
| 427 | """ |
| 428 | # Ensure valid island ID |
| 429 | island_id = island_id % len(self.islands) |
| 430 | |
| 431 | # Get programs from the specific island |
| 432 | island_programs = list(self.islands[island_id]) |
| 433 | |
| 434 | if not island_programs: |
| 435 | # Island is empty, fall back to sampling from all programs |
| 436 | logger.debug(f"Island {island_id} is empty, sampling from all programs") |
| 437 | return self.sample(num_inspirations) |
| 438 | |
| 439 | # Use exploration_ratio and exploitation_ratio to decide sampling strategy |
| 440 | # This matches the logic in _sample_parent() for consistent behavior |
| 441 | rand_val = random.random() |
| 442 | |
| 443 | if rand_val < self.config.exploration_ratio: |
| 444 | # EXPLORATION: Sample randomly from island (diverse sampling) |
| 445 | parent = self._sample_from_island_random(island_id) |
| 446 | sampling_mode = "exploration" |
| 447 | elif rand_val < self.config.exploration_ratio + self.config.exploitation_ratio: |
| 448 | # EXPLOITATION: Sample from archive (elite programs) |
| 449 | parent = self._sample_from_archive_for_island(island_id) |
| 450 | sampling_mode = "exploitation" |
| 451 | else: |
| 452 | # WEIGHTED: Use fitness-weighted sampling (remaining probability) |
| 453 | parent = self._sample_from_island_weighted(island_id) |
| 454 | sampling_mode = "weighted" |
| 455 | |
| 456 | # Select inspirations from the same island |
| 457 | if num_inspirations is None: |
| 458 | num_inspirations = 5 # Default for backward compatibility |
| 459 | |
| 460 | # Get other programs from the island for inspirations |
| 461 | other_programs = [pid for pid in island_programs if pid != parent.id] |
| 462 | |
| 463 | if len(other_programs) < num_inspirations: |
| 464 | # Not enough programs in island, use what we have |
| 465 | inspiration_ids = other_programs |
| 466 | else: |
no test coverage detected